Find Cheap Flights from Toronto to Seattle/Tacoma Intl (YTO - SEA)

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Good to Know

Low Season:
January
Best time to beat the crowds
3%
expected price decrease
High Season:
December
Most popular time to fly
6%
expected price increase
Average price:
C$ 654
(avg. price over the last 2 weeks)
Good Deal:
C$ 518
or less (round trip)

When to Book Flights from Toronto to Seattle/Tacoma Intl

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for C$ 517 or less.
The cheapest flight from Toronto to Seattle/Tacoma Intl was found, on average, 56 days before departure.
Book at least 2 weeks before departure in order to get a below-average price.
Morning departure is around 42% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Toronto to Seattle/Tacoma Intl Flights

How long does a flight from Toronto to Seattle/Tacoma Intl take?
An average nonstop flight takes 7h 21m, covering a distance of 3325 km.
How many flights are there between Toronto and Seattle/Tacoma Intl?
There are 28 (nonstop) flights between Toronto and Seattle/Tacoma Intl per week, averaging 3 per day.
Which airlines provide the cheapest flights from Toronto to Seattle/Tacoma Intl?
In the past 3 days, the cheapest round-trip tickets were found on United (C$ 407), Multiple Airlines (C$ 436) and American Airlines (C$ 437).
Do I need a passport to fly between Toronto and Seattle/Tacoma Intl?
Yes.
Which airlines fly most frequently between Toronto and Seattle/Tacoma Intl?
Air Canada (2 times daily), Brussels Airlines (1 times daily), United (1 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly from Toronto to Seattle/Tacoma Intl?
For Toronto to Seattle/Tacoma Intl, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle/Tacoma Intl back to Toronto, the best deals are generally found on Thursday, with Friday being the most expensive.

Book cheap flights from Toronto to Seattle/Tacoma Intl (round-trip)

Airports
Origin
Toronto
C$ 407
only
C$ 407
C$ 545
only
C$ 545
Destination
Seattle
C$ 407
only
C$ 407
Thu, 11 Jan
YYZ
SEA
8h 24m
Mon, 15 Jan
SEA
YYZ
7h 00m
C$ 407
Trip: 5 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 51451 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
IAH
PSP
Good 7.3

The crew was great.

Hard seats.....

YYZ
EWR
Mediocre 2.0

If they know that the flight is about to delayed then they must wait for the passengers for connecting flights!

SFO
BOS
Okay 5.0

Good entertainment options

EWR
RDU
Good 6.0

I liked the check-in and waiting area at the airport.

I did not like that we had to walk so much to the new gate assignment.

OGG
LAX
Okay 5.6

I liked ease of check in and the smooth takeoff and landing.

I hate that your planes have us packed in like sardines. There’s no room between seats, nor is there sufficient leg room. The airlines have simply gotten too greedy.

Thu, 11 Jan
YYZ
SEA
8h 24m
Mon, 15 Jan
SEA
YYZ
6h 55m
C$ 436
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Sun, 18 Feb
YYZ
SEA
9h 49m
Thu, 22 Feb
SEA
YYZ
10h 40m
C$ 437
Trip: 5 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25376 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PBI
CLT
Mediocre 3.0

I know this isn’t Kayak’s issue but American Airlines literally forgot to put fuel into the plane. We were delayed for over an hour and luckily I made my connection in Charlotte but only because they held the flight and it was not full. Had it been full I would have lost my seat.

LAX
OGG
Okay 5.3

First Class seating was of course better than economy.

Flight to Maui had no Mai Tai drinks available, no heated towels, no dessert, barely any service from the flight attendant(s).

FAT
LAX
Excellent 8.0

YYC is a nice airport. I have found I like Canadian's more then Americans when it come to air travel.

LAX is not a convenient airport at all.

CLT
BWI
Good 7.3

Crew was outstanding

Hurried beverage service since arriving early. R

TPA
MIA
Okay 5.6

I liked the way the AA gate supervisor too charge of the problem and solved it, with great deal of personal imvolvement and follow up. Also check-in crew was very much the best. I would say that AA showed the best of passages care to me. Truly outstanding.

Because of a mixup, though not of AA doing, I was literally forgotten at the gate. However, AA personnel showed the very best of can-do attitude and got me home for Thanksgiving. I am very proud of everyone working at AA at the TPA airport.

Thu, 11 Jan
YYZ
SEA
7h 21m
Mon, 15 Jan
SEA
YYZ
7h 44m
C$ 438
Trip: 5 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13693 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
ATL
DAB
Okay 4.0

Staff were friendly and worked hard.

Seats were very basic and not as good as the low cost carrier I normally fly out of the UK. Very old and noisy aircraft. Seemed little control over how much hand luggage passengers were bringing onto the aircraft.

PTY
ATL
Excellent 9.6

Crew was kind, entertainment and food were good

Seats are really tight

SEA
SJC
Okay 5.6

No vegetarian options in first class.. and go go wouldn5 hook up. Flight was an hour late...but that was ok.

The pilot did a nice job of flying in and banking so we could see the view..

LHR
ATL
Good 6.0

Staff were friendly and attentive. Boarding was good - efficient and quick.

Seats were not that comfortable. Aircraft very noisy. Competition offers a much better service. Transfer in Atlanta was a nightmare, taking almost two hours from landing to getting to the domestic gate for the next sector. only three immigration staff working.

PHL
JFK
Excellent 9.0

We were probably in the air for 30 mins; great short flight. Plane wasn’t filled so had plenty of space.

Thu, 30 Nov
YYZ
SEA
8h 24m
Mon, 4 Dec
SEA
YYZ
7h 24m
C$ 687
Trip: 5 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 3696 reviews
Overall
8.2
Boarding
8.3
Comfort
8.0
Crew
8.6
Entertainment
7.2
Food
7.3
SJO
YYZ
Excellent 10.0

Very helpful and friendly staff.

Having to leave Costa rica

YWG
YYZ
Good 7.6

Quick boarding, good customer service, and friendly staff.

When I booked online it was a little unclear that I would have to pay extra to check a bag. No problem but would make a better customer experience if I had been aware of this

BZE
YYZ
Okay 5.0

Good snacks $

Title says it.

YEG
YMM
Good 7.6

Overall flight and connections were good. Board process was smooth and flight departed and arrived on time. Watch for baggage delays when arriving in Fort McMurray as they can sometimes be excessive. No entertainment provided on the smaller planes but most people have some form of entertainment with them.

LGA
YYZ
Excellent 10.0

Not applicable

Sat, 24 Feb
YTZ
SEA
10h 31m
Sat, 3 Mar
SEA
YTZ
10h 21m
C$ 705
Trip: 8 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 1701 reviews
Boarding
8.0
Comfort
8.0
Crew
8.4
Entertainment
7.0
Food
7.9
MDW
YTZ
Excellent 10.0

The earlier flight departure times are really good, the traffic is not jammed yet on the 401 and GEW. Custom waiting times are basically non existing in comparison to Pearson. Planes are relatively on time (only flew 4 times with Porte), staff is friendly. The turboprop planes have more legroom than most others. I do like them, and do recommend Porter.

YTZ
YQB
Excellent 9.3

This was my first time flying Porter. The flight was a reasonable price, the service was great. The aircraft was a little on the smaller side but still spacious enough for comfortable travel.

YOW
YTZ
Excellent 10.0

On time. Provided snacks and drinks even on a short flight. Group lobby prior to boarding provided coffee, tea, snacks, water for free.

YOW
YTZ
Excellent 10.0

the delays both from ottawa and to dc

YTZ
EWR
Excellent 10.0

as above

Sun, 20 May
YTZ
SEA
11h 16m
Sun, 27 May
SEA
YTZ
10h 15m
C$ 869
Trip: 8 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 19871 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
HND
YYZ
Okay 4.4

Lowest fare

Online checkin failed, airport kiosk couldn't handle how names are written on Japanese passports (it's English) and had to wait 2 hours on the line to check in because they were down to 1 agent toward the end. Made it to the gate just as boarding started. Very limited entertainment options for modern day airlines. Uncomfortable seating.

LHR
YVR
Okay 5.6

They have good entertainment system and library

The plane delayed for almost 90m due to a mechanical issue. Of course, we missed our connection in Vancouver. Upon arriving in Vancouver, there was no help at all or guidance. Customer support desk was manned by one agent even in the presence of long queues.

DEN
YYZ
Good 6.6

Good boarding.Easy check in.

Food! Not appealing. Did not eat more than a few bites.

ORD
YYZ
Mediocre 2.0

Nothing

Flight delay led us to miss our connecting flight. Air Canada then lost our luggage for 6 days on our honeymoon!

YYC
YUL
Good 6.3

I almost missed my connection. No one cared. Staff in airport were downright cranky - all due to late incoming aircraft and yet more de-icing... why ever don't they allow time for that in November!!!

Wed, 28 Mar
YYZ
SEA
7h 36m
Tue, 3 Apr
SEA
YYZ
6h 58m
C$ 455
Trip: 7 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13693 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
JFK
DTW
Excellent 10.0

I got off the flight at out side,but i forgot to carried my small bag .and then the Crew returned me the bag very soon.they were very kind,thank you very much.

LAX
HNL
Okay 5.0

The gentleman at the gate was super helpful and helped us check our bags at the gate.

Zero leg room. Zero arm room. The entertainment system did not function. No food for such a long flight unless you pay more then the food is actually worth.

ATL
DAB
Okay 4.0

Staff were friendly and worked hard.

Seats were very basic and not as good as the low cost carrier I normally fly out of the UK. Very old and noisy aircraft. Seemed little control over how much hand luggage passengers were bringing onto the aircraft.

ATL
HPN
Good 7.3

It was on time

It was crowded and cramped.

PTY
ATL
Excellent 9.6

Crew was kind, entertainment and food were good

Seats are really tight

Sat, 24 Feb
YYZ
SEA
11h 47m
Sat, 3 Mar
SEA
YYZ
8h 26m
C$ 473
Trip: 8 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 51451 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
EWR
PVD
Excellent 8.0

Quick flight, no complaints.

PHL
IAH
Good 7.6

Crew was great, and boarding was a breeze.

For the price, there should be better food, and a bit more breathing room.

DCA
IAH
Good 7.0

Arrived early, friendly crew

Made me check my bag when there was PLENTY of space to carryon but they said space was limited

IAH
TUL
Excellent 10.0

The view of the sun set

SLC
EWR
Good 6.0

Was not offered snacks or food. Usually when I take united to california, which is a shorter flight, they give out pretzels or something. Was not even offered the chance to purchase breakfast.

Stated above.

Fri, 15 Dec
YYZ
SEA
7h 38m
Sun, 17 Dec
SEA
YYZ
10h 13m
C$ 484
Trip: 3 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25376 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
MBJ
PHL
Excellent 8.0

The cost for the internet was great

Hmm can’t think of anything at this time

EWR
PHX
Okay 5.6

Got me to where I'm going safely. Crew was nice.

Flying is painful

MEM
DFW
Mediocre 2.0

Absolutely nothing

Everything about the flight was awful. Food pathetic, my monitor didn’t work, smooshed between 2 overweight passengers. Flight crew lacked simple etiquette.

TPA
MIA
Okay 5.6

I liked the way the AA gate supervisor too charge of the problem and solved it, with great deal of personal imvolvement and follow up. Also check-in crew was very much the best. I would say that AA showed the best of passages care to me. Truly outstanding.

Because of a mixup, though not of AA doing, I was literally forgotten at the gate. However, AA personnel showed the very best of can-do attitude and got me home for Thanksgiving. I am very proud of everyone working at AA at the TPA airport.

GSP
PHL
Good 6.0

ON TIME AND VERY SMOOTH. EVEN EARLY! THANKS!

Very high decibel high pitched noise from engines as we taxied to gate in PHL. VERY annoying. Lasted over 5 minutes. ALSO, i didnt need to print out own boarding passes. You could fix your website check in px.

Mon, 21 May
YYZ
SEA
7h 21m
Wed, 30 May
SEA
YYZ
6h 43m
C$ 455
Trip: 10 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13693 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
PHL
JFK
Excellent 9.0

We were probably in the air for 30 mins; great short flight. Plane wasn’t filled so had plenty of space.

ATL
HPN
Good 7.3

It was on time

It was crowded and cramped.

JFK
DTW
Excellent 10.0

I got off the flight at out side,but i forgot to carried my small bag .and then the Crew returned me the bag very soon.they were very kind,thank you very much.

ATL
DAB
Okay 4.0

Staff were friendly and worked hard.

Seats were very basic and not as good as the low cost carrier I normally fly out of the UK. Very old and noisy aircraft. Seemed little control over how much hand luggage passengers were bringing onto the aircraft.

JFK
CUN
Excellent 9.0

Entertainment and crew were great- comfortable seats, got to watch a couple of movies with headphones provided by Delta; forgot mine so I assumed I would be miserable thru the whole 4 hour flight. so glad I was wrong! Would definitely take another flight with Delta... looking into the frequent flyer program as we speak

Sun, 17 Dec
YYZ
SEA
13h 03m
Tue, 26 Dec
SEA
YYZ
13h 59m
C$ 507
Trip: 10 days
Overall 0.0 Poor
Based on 0 reviews
Fri, 27 Apr
YYZ
SEA
9h 20m
Fri, 4 May
SEA
YYZ
9h 03m
C$ 478
Trip: 8 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13693 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
JFK
DTW
Excellent 10.0

I got off the flight at out side,but i forgot to carried my small bag .and then the Crew returned me the bag very soon.they were very kind,thank you very much.

SEA
SJC
Okay 5.6

No vegetarian options in first class.. and go go wouldn5 hook up. Flight was an hour late...but that was ok.

The pilot did a nice job of flying in and banking so we could see the view..

JFK
CUN
Excellent 9.0

Entertainment and crew were great- comfortable seats, got to watch a couple of movies with headphones provided by Delta; forgot mine so I assumed I would be miserable thru the whole 4 hour flight. so glad I was wrong! Would definitely take another flight with Delta... looking into the frequent flyer program as we speak

LHR
ATL
Good 6.0

Staff were friendly and attentive. Boarding was good - efficient and quick.

Seats were not that comfortable. Aircraft very noisy. Competition offers a much better service. Transfer in Atlanta was a nightmare, taking almost two hours from landing to getting to the domestic gate for the next sector. only three immigration staff working.

PBI
ATL
Good 6.0

On time; safe flight

Service from boarding to landing was impersonal. No headphones etc. Etc.

Sat, 6 Jan
YTZ
SEA
10h 19m
Fri, 12 Jan
SEA
YTZ
11h 41m
C$ 545
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Thu, 11 Jan
YTZ
SEA
10h 50m
Mon, 15 Jan
SEA
YTZ
10h 46m
C$ 557
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Sat, 28 Apr
YYZ
SEA
7h 37m
Sun, 6 May
SEA
YYZ
10h 30m
C$ 509
Trip: 9 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13693 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SEA
SJC
Okay 5.6

No vegetarian options in first class.. and go go wouldn5 hook up. Flight was an hour late...but that was ok.

The pilot did a nice job of flying in and banking so we could see the view..

SAV
ATL
Good 7.0

The flight was on schedule

It was crowded and cramped.

ATL
DAB
Okay 4.0

Staff were friendly and worked hard.

Seats were very basic and not as good as the low cost carrier I normally fly out of the UK. Very old and noisy aircraft. Seemed little control over how much hand luggage passengers were bringing onto the aircraft.

PTY
ATL
Excellent 9.6

Crew was kind, entertainment and food were good

Seats are really tight

PHL
JFK
Excellent 9.0

We were probably in the air for 30 mins; great short flight. Plane wasn’t filled so had plenty of space.

Wed, 28 Mar
YTZ
SEA
10h 50m
Tue, 3 Apr
SEA
YTZ
10h 26m
C$ 720
Trip: 7 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 1701 reviews
Boarding
8.0
Comfort
8.0
Crew
8.4
Entertainment
7.0
Food
7.9
YTZ
YQB
Excellent 9.3

This was my first time flying Porter. The flight was a reasonable price, the service was great. The aircraft was a little on the smaller side but still spacious enough for comfortable travel.

EWR
YTZ
Excellent 10.0

I have flown on Porter numerous time but this was the first for my family. They enjoyed the Porter lounge and convenience of flying from the Toronto island right into EWR. We were able to take the NJ Train right to Penn Station (NYC) faster than any taxi.

IAD
YTZ
Excellent 10.0

Porter Airline was amazing!! They use glasses instead of plastic cups! Nice, cheap, on time, and free wine!

YTZ
IAD
Excellent 10.0

Smaller gate lounge area with lots of private space and complimentary drinks and snack. All Porter employees that I had interaction were professional and attentive to my needs

No suggestion

YTZ
EWR
Excellent 10.0

as above

Thu, 31 May
YYZ
SEA
10h 29m
Sat, 9 Jun
SEA
YYZ
10h 25m
C$ 509
Trip: 10 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13693 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
LHR
ATL
Good 6.0

Staff were friendly and attentive. Boarding was good - efficient and quick.

Seats were not that comfortable. Aircraft very noisy. Competition offers a much better service. Transfer in Atlanta was a nightmare, taking almost two hours from landing to getting to the domestic gate for the next sector. only three immigration staff working.

JFK
CUN
Excellent 9.0

Entertainment and crew were great- comfortable seats, got to watch a couple of movies with headphones provided by Delta; forgot mine so I assumed I would be miserable thru the whole 4 hour flight. so glad I was wrong! Would definitely take another flight with Delta... looking into the frequent flyer program as we speak

JFK
DTW
Excellent 10.0

I got off the flight at out side,but i forgot to carried my small bag .and then the Crew returned me the bag very soon.they were very kind,thank you very much.

PBI
ATL
Good 6.0

On time; safe flight

Service from boarding to landing was impersonal. No headphones etc. Etc.

LAX
HNL
Okay 5.0

The gentleman at the gate was super helpful and helped us check our bags at the gate.

Zero leg room. Zero arm room. The entertainment system did not function. No food for such a long flight unless you pay more then the food is actually worth.

Fri, 24 Nov
YYZ
SEA
8h 19m
Sun, 26 Nov
SEA
YYZ
9h 28m
C$ 784
Trip: 3 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 3696 reviews
Overall
8.2
Boarding
8.3
Comfort
8.0
Crew
8.6
Entertainment
7.2
Food
7.3
YWG
YYZ
Good 7.6

Quick boarding, good customer service, and friendly staff.

When I booked online it was a little unclear that I would have to pay extra to check a bag. No problem but would make a better customer experience if I had been aware of this

LGA
YYZ
Excellent 10.0

Not applicable

YYZ
LAX
Excellent 10.0

Lots of room- great aircraft

YYZ
YYC
Mediocre 2.6

I had a very rude and mean flight attendant. I was yelled at and wasn’t offered any beverages or food afterwards. I was ending a phone call with the rcmp and without rudely hanging up on him due to my truck being stolen and being out of the country for 11 days. I was yelled at from 6 rows away in a very arrogant rude tone for the whole plane to hear. I was embarrassed and uncomfortable for the rest of the flight as well as being in a bad mood. Not being offered any beverages or food afterwards also made for a long flight. Was not impressed in the slightest as I fly with west jet every week and have never had such a rude flight attendant.

BZE
YYZ
Okay 5.0

Good snacks $

Title says it.

Thu, 30 Nov
YYZ
SEA
8h 24m
Thu, 7 Dec
SEA
YYZ
6h 43m
C$ 593
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Show more results
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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.