Question 1

How long does a flight from Seattle to Ontario take?

Accepted Answer

Direct flights cover the 2,477 km separating Seattle to Ontario in about 2h 34m. Visit our flight page for the latest deals!>/a>

Question 2

How many flights are there between Seattle and Ontario per day?

Accepted Answer

Each day, there are between 6 and 8 nonstop flights that take off from Seattle and land in Ontario, with an average flight time of 2h 41m. The most common departure time is 8:00 p.m. and most flights take off in the morning. Each week, there are 49 flights. The most frequent day of departure is Monday, when 16% of all weekly flights depart. The fewest flights depart on a Tuesday. Visit our flight page for the latest deals!>/a>

Question 3

How many flights are there between Seattle and Ontario per day?

Accepted Answer

Each day, there are between 6 and 8 nonstop flights that take off from Seattle and land in Ontario, with an average flight time of 2h 41m. The most common departure time is 8:00 p.m. and most flights take off in the morning. Each week, there are 49 flights. The most frequent day of departure is Monday, when 16% of all weekly flights depart. The fewest flights depart on a Tuesday. Visit our flight page for the latest deals!>/a>

Question 4

What is the cheapest flight from Seattle to Ontario?

Accepted Answer

In the last 3 days, the lowest price for a flight from Seattle to Ontario was C$ 125 for a one-way ticket and C$ 248 for a round-trip. <a href='/flight-routes/Seattle-Tacoma-Intl-SEA/Ontario-ONT'>Visit our flight page for the latest deals!>/a>

Question 5

Which airlines fly most frequently between Seattle and Ontario?

Accepted Answer

Seattle and Ontario are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (25 flights per week), Delta (21 flights per week), and Frontier (3 flights per week). Visit our flight page for the latest deals!>/a>

Question 6

Which airlines fly most frequently between Seattle and Ontario?

Accepted Answer

Seattle and Ontario are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (25 flights per week), Delta (21 flights per week), and Frontier (3 flights per week). Visit our flight page for the latest deals!>/a>

Question 7

What’s the cheapest day of the week to fly from Seattle to Ontario?

Accepted Answer

When flying from Seattle to Ontario, you should consider leaving on a Sunday and avoid Thursdays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Saturdays and the most expensive ones on Wednesdays. Visit our flight page for the latest deals!>/a>

Question 8

What’s the cheapest day of the week to fly from Seattle to Ontario?

Accepted Answer

When flying from Seattle to Ontario, you should consider leaving on a Sunday and avoid Thursdays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Saturdays and the most expensive ones on Wednesdays. Visit our flight page for the latest deals!>/a>

Question 9

Which airports will I be using when flying from Seattle to Ontario?

Accepted Answer

Seattle airport is called Seattle/Tacoma Intl and the only airport in Ontario is Ontario. <a href='/flight-routes/Seattle-Tacoma-Intl-SEA/Ontario-ONT'>Visit our flight page for the latest deals!>/a>

Question 10

What’s the earliest departure time from Seattle to Ontario?

Accepted Answer

Early birds can take the earliest flight from Seattle at 7:15 am and will be landing in Ontario at 9:55 am.

Question 11

What’s the latest departure time from Seattle to Ontario?

Accepted Answer

If you prefer to fly at night, the latest flight from Seattle to Ontario jets off at 10:25 pm and lands at 1:01 am.

Question 12

Which airlines fly direct between Seattle and Ontario?

Accepted Answer

There is just one airline that flies from Seattle to Ontario direct and that is Frontier. The best round-trip deal found from Frontier for the route is C$ 95.

Question 13

Which airlines fly direct between Seattle and Ontario?

Accepted Answer

There is just one airline that flies from Seattle to Ontario direct and that is Frontier. The best round-trip deal found from Frontier for the route is C$ 95.

Question 14

Which airlines offer Wi-Fi service onboard planes from Seattle to Ontario?

Accepted Answer

Alaska Airlines, Hawaiian Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Seattle to Ontario flight route.

Question 15

Which aircraft models fly most regularly from Seattle to Ontario?

Accepted Answer

The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Seattle to Ontario flight route.

Question 16

On which days can I fly direct from Seattle to Ontario?

Accepted Answer

There are direct flights from Seattle to Ontario on a daily basis.

Question 17

What is the cheapest month to fly from Seattle to Ontario?

Accepted Answer

The cheapest month for flights from Seattle to Ontario is March, where tickets cost C$ 263 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is C$ 375 and C$ 360 respectively.

Question 18

What is the cheapest month to fly from Seattle to Ontario?

Accepted Answer

The cheapest month for flights from Seattle to Ontario is March, where tickets cost C$ 263 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is C$ 375 and C$ 360 respectively.

Question 19

How does KAYAK find such low prices on flights from Seattle to Ontario?

Accepted Answer

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Ontario. <a href='/flight-routes/Seattle-Tacoma-Intl-SEA/Ontario-ONT'>Visit our flight page for the latest deals!>/a>

Question 20

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Ontario?

Accepted Answer

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Seattle is likely to change within 7 days, so travelers know whether to wait or book now. <a href='/flight-routes/Seattle-Tacoma-Intl-SEA/Ontario-ONT'>Visit our flight page for the latest deals!>/a>

Question 21

What is the Hacker Fare option on flights from Seattle to Ontario?

Accepted Answer

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Seattle with another airline. <a href='/flight-routes/Seattle-Tacoma-Intl-SEA/Ontario-ONT'>Visit our flight page for the latest deals!>/a>

Question 22

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Ontario?

Accepted Answer

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. <a href='/flight-routes/Seattle-Tacoma-Intl-SEA/Ontario-ONT'>Visit our flight page for the latest deals!>/a>

Question 23

Which cabin class options are there for flights between Seattle and Ontario?

Accepted Answer

There are 2 cabin class options for the route. These are Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Question 24

Which cabin class options are there for flights between Seattle and Ontario?

Accepted Answer

There are 2 cabin class options for the route. These are Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Question 25

Which airlines provide the cheapest flights from Seattle to Ontario?

Accepted Answer

In the past 3 days, the cheapest round-trip tickets from Seattle to Ontario were found on Delta (C$ 248) and Alaska Airlines (C$ 262).

Question 26

Which airlines provide the cheapest flights from Seattle to Ontario?

Accepted Answer

In the past 3 days, the cheapest round-trip tickets from Seattle to Ontario were found on Delta (C$ 248) and Alaska Airlines (C$ 262).

Question 27

How far in advance should I book a flight from Seattle to Ontario?

Accepted Answer

To get a below average price on the flight from Seattle to Ontario, you should book around 3 weeks before departure, which saves you about 27% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Question 28

How far in advance should I book a flight from Seattle to Ontario?

Accepted Answer

To get a below average price on the flight from Seattle to Ontario, you should book around 3 weeks before departure, which saves you about 27% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Question 29

What are the most popular airlines flying to Ontario?

Accepted Answer

The most popular airline among KAYAK users flying to Ontario is Frontier, followed by Alaska Airlines and Spirit Airlines.

Low season	September
High season	November
Cheapest flight	C$ 125

SEA - ONT

C$ 125 Find Cheap Flights from Seattle to Ontario

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

Cheap Flights from Seattle to Ontario (SEA-ONT)

Recent round-trip flight deals from Seattle to Ontario

Recent one-way flight deals from Seattle to Ontario

Recent last minute flight deals from Seattle to Ontario

Recent direct flight deals from Seattle to Ontario

Everything you should know

KAYAK's insights & trends for Seattle to Ontario flights

Get data-powered insights and trends into flights from Seattle to Ontario to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Seattle to Ontario?

When flying from Seattle to Ontario, you should consider leaving on a Sunday and avoid Thursdays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Saturdays and the most expensive ones on Wednesdays.

What is the cheapest month to fly from Seattle to Ontario?

The cheapest month for flights from Seattle to Ontario is March, where tickets cost C$ 263 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is C$ 375 and C$ 360 respectively.

How far in advance should I book a flight from Seattle to Ontario?

To get a below average price on the flight from Seattle to Ontario, you should book around 3 weeks before departure, which saves you about 27% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Which airlines provide the cheapest flights from Seattle to Ontario?

In the past 3 days, the cheapest round-trip tickets from Seattle to Ontario were found on Delta (C$ 248) and Alaska Airlines (C$ 262).

Which airlines fly most frequently between Seattle and Ontario?

Seattle and Ontario are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (25 flights per week), Delta (21 flights per week), and Frontier (3 flights per week).

Which airlines fly direct between Seattle and Ontario?

There is just one airline that flies from Seattle to Ontario direct and that is Frontier. The best round-trip deal found from Frontier for the route is C$ 95.

Which cabin class options are there for flights between Seattle and Ontario?

There are 2 cabin class options for the route. These are Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How many flights are there between Seattle and Ontario per day?

How long does a flight from Seattle to Ontario take?

Direct flights cover the 2,477 km separating Seattle to Ontario in about 2h 34m.

What’s the earliest departure time from Seattle to Ontario?

Early birds can take the earliest flight from Seattle at 7:15 am and will be landing in Ontario at 9:55 am.

What’s the latest departure time from Seattle to Ontario?

If you prefer to fly at night, the latest flight from Seattle to Ontario jets off at 10:25 pm and lands at 1:01 am.

Good to know

When to book flights from Seattle to Ontario

Flights from Seattle to Ontario: the best tips from KAYAK users' own experiences

FAQs for booking flights from Seattle to Ontario

What is the cheapest flight from Seattle to Ontario?

In the last 3 days, the lowest price for a flight from Seattle to Ontario was C$ 125 for a one-way ticket and C$ 248 for a round-trip.

Which airports will I be using when flying from Seattle to Ontario?

Seattle airport is called Seattle/Tacoma Intl and the only airport in Ontario is Ontario.

Which airlines offer Wi-Fi service onboard planes from Seattle to Ontario?

Alaska Airlines, Hawaiian Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Seattle to Ontario flight route.

Which aircraft models fly most regularly from Seattle to Ontario?

The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Seattle to Ontario flight route.

On which days can I fly direct from Seattle to Ontario?

There are direct flights from Seattle to Ontario on a daily basis.

How does KAYAK find such low prices on flights from Seattle to Ontario?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Ontario.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Ontario?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Seattle to Ontario?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Seattle with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Ontario?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Ontario

Prefer to fly direct from Seattle to Ontario?

Reviews of the top airline flying from Seattle to Ontario

Everything you need to know for your flight from Seattle to Ontario

Information on your arrival and departure airports

Cabin class types available on flights from Seattle to Ontario

Complete your trip to Ontario with a hotel stay or car rental

Find direct flights to and from Seattle and Ontario

Flights to other popular destinations

Flights from domestic origins to Ontario

Choose which airport to fly into in Ontario