Which airports can I use when flying from Ottawa to St. Louis?

Flights from Ottawa to St. Louis usually depart from Ottawa (YOW) and arrive at Lambert-St Louis (STL).

Which cabin classes can I book on flights from Ottawa to St. Louis?

Only Economy Class is available on flights from Ottawa to St. Louis.

Which airports do connecting flights from Ottawa to St. Louis pass through?

One-stop flights from Ottawa to St. Louis most commonly connect through: • Toronto Pearson Intl (YYZ) – 58% of one-stop connections • Chicago O'Hare Intl (ORD) – 33% of one-stop connections • Montreal Pierre Elliott Trudeau Intl (YUL) – 7% of one-stop connections • Newark (EWR) – 2% of one-stop connections

Can I save money by using flexible dates for flights from Ottawa to St. Louis?

Yes. Flexible dates can save you up to 55% on flights from Ottawa to St. Louis. Tuesday is the cheapest departure day at C$ 399 round-trip on average, while Saturday is the most expensive at C$ 870, a difference of C$ 471. KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.

Which popular places can I visit in St. Louis?

Some of the most popular sights in St. Louis are Forest Park Hotel, Hyatt Regency St Louis At The Arch, and America's Center Convention Complex. These are among the most viewed places in St. Louis on KAYAK.

How long does a flight from Ottawa to St. Louis take?

There are currently no direct flights available from Ottawa to St. Louis. Flights with 1 layover take between 5h 32m and 6h 10m in total, depending on the connection.

Do I need a passport to fly from Ottawa to St. Louis?

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Have flight prices from Ottawa to St. Louis changed much recently?

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about C$ 701 to C$ 1,847. That means the highest observed fare was about 3x higher than the lowest one.

How much time can I save by choosing a different layover airport when travelling from Ottawa to St. Louis?

Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 5h 32m, compared with 5h 40m via Toronto Pearson Intl (YYZ) and 5h 46m via Chicago O'Hare Intl (ORD).

What is the time difference between Ottawa and St. Louis?

St. Louis is 1 hour behind Ottawa (Central Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Lambert-St Louis Airport (STL)?

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates averaging C$ 109 for economy cars. Top options include: • Hertz • Budget • Alamo • Enterprise Rent-A-Car • Payless

How much should I expect to pay for a Ottawa to St. Louis flight?

Round-trip flights from Ottawa to St. Louis range from C$ 491 to C$ 814, with an average of C$ 649 over the past 12 months. Anything below C$ 491 counts as a good deal.

What's the cheapest day of the week to fly from Ottawa to St. Louis?

Based on deals KAYAK users found in the last 12 months, Tuesday is the cheapest day of the week to fly from Ottawa to St. Louis. It's 39% cheaper than the average day, while Saturday is the most expensive, with prices 34% higher.

Which airline is the cheapest to fly from Ottawa to St. Louis?

Air Canada (C$ 919) and United Airlines (C$ 948) are the cheapest airlines to fly round-trip from Ottawa to St. Louis according to KAYAK data over the last 5 days.

What’s the most popular layover airport when flying from Ottawa to St. Louis?

Toronto Pearson Intl (YYZ) is the most popular layover for the Ottawa to St. Louis route. 58% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via YYZ.

What is the cheapest layover airport when flying from Ottawa to St. Louis?

Flights via Newark (EWR) offer the most affordable fares, with an average round-trip price of C$ 486. Based on KAYAK data over the past 3 months.

When flying from Ottawa to St. Louis, which airport offers the shortest layover?

Chicago O'Hare Intl (ORD) had the shortest average connection time for Ottawa to St. Louis layovers at 3h 46m over the past three months.

Cheap Flights from Ottawa to St. Louis | KAYAK

Save 25% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Cheapest round-trip

C$ 701

Typical prices: C$ 491-C$ 814

Multiple Airlines

Sat 24/11Sun 2/12

YOW - STL • 1 stop

When to travel

May

Cheapest • 37% price drop

June

Most popular

Good to know

Top layover airports

Newark (EWR)

Cheapest • Avg C$ 486 (round-trip)

Montreal Pierre Elliott Trudeau Intl (YUL)

Shortest trip • 5h 32m (one-way)

Insights

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KAYAK searches hundreds of sites at once to find you the best travel deals.

We hope you enjoy your trip to St. Louis!

Flight Deals

Cheap Flights from Ottawa to St. Louis (YOW-STL)

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Ottawa to St. Louis

Tue, 24 Nov - Wed, 2 Dec

8:00 a.m. - 11:59 p.m.YOW Ottawa-STL Lambert-St Louis

16h 59m1 stop Orlando

12:05 p.m. - 2:32 p.m.STL Lambert-St Louis-YOW Ottawa

25h 27m2 stops Atlanta Hartsfield-Jackson Newark

C$ 701Multiple Airlines

1 day ago

Fri, 11 Dec - Mon, 14 Dec

8:40 a.m. - 10:57 a.m.YOW Ottawa-STL Lambert-St Louis

27h 17m3 stops Vancouver Intl Phoenix Sky Harbor Intl Denver Intl

12:02 p.m. - 6:13 p.m.STL Lambert-St Louis-YOW Ottawa

29h 11m3 stops Atlanta Hartsfield-Jackson Newark Toronto Island

C$ 734Multiple Airlines

3+ days ago

Tue, 24 Nov - Tue, 1 Dec

8:00 a.m. - 5:40 p.m.YOW Ottawa-STL Lambert-St Louis

34h 40m2 stops Orlando Atlanta Hartsfield-Jackson

6:13 p.m. - 4:45 p.m.STL Lambert-St Louis-YOW Ottawa

21h 32m1 stop Orlando

C$ 741Multiple Airlines

1 day ago

Wed, 25 Nov - Wed, 2 Dec

8:00 a.m. - 11:59 p.m.YOW Ottawa-STL Lambert-St Louis

16h 59m1 stop Orlando

12:05 p.m. - 2:32 p.m.STL Lambert-St Louis-YOW Ottawa

25h 27m2 stops Atlanta Hartsfield-Jackson Newark

C$ 759Multiple Airlines

1 day ago

Tue, 29 Dec - Mon, 4 Jan

10:05 a.m. - 3:26 p.m.YOW Ottawa-STL Lambert-St Louis

6h 21m1 stop Toronto Pearson Intl

4:05 p.m. - 10:55 p.m.STL Lambert-St Louis-YOW Ottawa

5h 50m1 stop Toronto Pearson Intl

C$ 919Air Canada

3+ days ago

Sat, 28 Nov - Wed, 2 Dec

9:10 a.m. - 3:26 p.m.YOW Ottawa-STL Lambert-St Louis

7h 16m1 stop Toronto Pearson Intl

4:05 p.m. - 11:55 p.m.STL Lambert-St Louis-YOW Ottawa

6h 50m1 stop Toronto Pearson Intl

C$ 937Air Canada

1 day ago

Tue, 24 Nov - Fri, 27 Nov

9:10 a.m. - 3:26 p.m.YOW Ottawa-STL Lambert-St Louis

7h 16m1 stop Toronto Pearson Intl

4:05 p.m. - 11:55 p.m.STL Lambert-St Louis-YOW Ottawa

6h 50m1 stop Toronto Pearson Intl

C$ 937Air Canada

1 day ago

Wed, 25 Nov - Tue, 1 Dec

10:30 a.m. - 9:40 p.m.YOW Ottawa-STL Lambert-St Louis

12h 10m2 stops Washington, D.C. Reagan-National Chicago O'Hare Intl

8:30 a.m. - 9:56 p.m.STL Lambert-St Louis-YOW Ottawa

12h 26m2 stops Washington, D.C. Dulles Intl Newark

C$ 948United Airlines

1 day ago

Wed, 25 Nov - Wed, 2 Dec

10:30 a.m. - 8:52 a.m.YOW Ottawa-STL Lambert-St Louis

23h 22m2 stops Washington, D.C. Reagan-National Newark

1:18 p.m. - 2:29 p.m.STL Lambert-St Louis-YOW Ottawa

24h 11m2 stops Chicago O'Hare Intl Washington, D.C. Reagan-National

C$ 948United Airlines

2 days ago

Wed, 25 Nov - Wed, 2 Dec

3:10 p.m. - 8:52 a.m.YOW Ottawa-STL Lambert-St Louis

18h 42m1 stop Newark

1:18 p.m. - 2:29 p.m.STL Lambert-St Louis-YOW Ottawa

24h 11m2 stops Chicago O'Hare Intl Washington, D.C. Reagan-National

C$ 948United Airlines

2 days ago

Recent last minute flight deals from Ottawa to St. Louis

Thu, 5 Nov - Sun, 15 Nov

8:00 a.m. - 11:16 p.m.YOW Ottawa-STL Lambert-St Louis

16h 16m1 stop Orlando

12:14 p.m. - 5:24 p.m.STL Lambert-St Louis-YOW Ottawa

52h 10m2 stops Dallas/Fort Worth Fort Lauderdale

C$ 1,070Multiple Airlines

3+ days ago

Thu, 5 Nov - Sun, 15 Nov

6:15 a.m. - 2:34 p.m.YOW Ottawa-STL Lambert-St Louis

9h 19m1 stop Chicago O'Hare Intl

4:05 p.m. - 1:40 a.m.STL Lambert-St Louis-YOW Ottawa

8h 35m1 stop Toronto Pearson Intl

C$ 1,192Air Canada

3+ days ago

Thu, 5 Nov - Sun, 15 Nov

4:46 p.m. - 9:40 p.m.YOW Ottawa-STL Lambert-St Louis

5h 54m1 stop Chicago O'Hare Intl

8:00 a.m. - 3:07 p.m.STL Lambert-St Louis-YOW Ottawa

6h 07m1 stop Washington, D.C. Dulles Intl

C$ 1,246United Airlines

3+ days ago

Mon, 2 Nov - Mon, 9 Nov

7:00 a.m. - 11:16 p.m.YOW Ottawa-STL Lambert-St Louis

17h 16m2 stops Toronto Pearson Intl Orlando

1:28 p.m. - 5:52 p.m.STL Lambert-St Louis-YOW Ottawa

27h 24m3 stops Las Vegas Harry Reid Intl Orlando Toronto Pearson Intl

C$ 1,291Multiple Airlines

2 days ago

Mon, 2 Nov - Mon, 9 Nov

3:10 p.m. - 9:52 p.m.YOW Ottawa-STL Lambert-St Louis

7h 42m1 stop Newark

9:40 a.m. - 9:56 p.m.STL Lambert-St Louis-YOW Ottawa

11h 16m2 stops Chicago O'Hare Intl Newark

C$ 1,317United Airlines

2 days ago

Mon, 2 Nov - Mon, 9 Nov

9:45 a.m. - 9:40 p.m.YOW Ottawa-STL Lambert-St Louis

12h 55m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl

5:00 a.m. - 3:07 p.m.STL Lambert-St Louis-YOW Ottawa

9h 07m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl

C$ 1,317United Airlines

2 days ago

Mon, 2 Nov - Mon, 9 Nov

6:00 a.m. - 10:48 a.m.YOW Ottawa-STL Lambert-St Louis

5h 48m1 stop Newark

5:00 a.m. - 2:09 p.m.STL Lambert-St Louis-YOW Ottawa

8h 09m1 stop Chicago O'Hare Intl

C$ 1,317United Airlines

2 days ago

Mon, 2 Nov - Mon, 9 Nov

7:00 a.m. - 11:16 p.m.YOW Ottawa-STL Lambert-St Louis

17h 16m2 stops Toronto Pearson Intl Orlando

1:28 p.m. - 4:45 p.m.STL Lambert-St Louis-YOW Ottawa

26h 17m2 stops Las Vegas Harry Reid Intl Orlando

C$ 1,333Multiple Airlines

2 days ago

Thu, 5 Nov - Sun, 15 Nov

7:05 a.m. - 12:33 p.m.YOW Ottawa-STL Lambert-St Louis

30h 28m3 stops Fort Lauderdale Atlanta Hartsfield-Jackson Las Vegas Harry Reid Intl

4:26 p.m. - 10:02 p.m.STL Lambert-St Louis-YOW Ottawa

28h 36m3 stops Orlando Baltimore/Washington Toronto Pearson Intl

C$ 1,495Multiple Airlines

3+ days ago

Thu, 5 Nov - Sun, 15 Nov

8:00 a.m. - 11:16 p.m.YOW Ottawa-STL Lambert-St Louis

16h 16m1 stop Orlando

4:26 p.m. - 10:02 p.m.STL Lambert-St Louis-YOW Ottawa

28h 36m3 stops Orlando Baltimore/Washington Toronto Pearson Intl

C$ 1,516Multiple Airlines

3+ days ago

Booking Insights

Price, demand, and travel trends for Ottawa to St. Louis flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights with more confidence.

Prices

Airlines

Layovers

What's the cheapest day of the week to fly from Ottawa to St. Louis?: Based on deals KAYAK users found in the last 12 months, Tuesday is the cheapest day of the week to fly from Ottawa to St. Louis. It's 39% cheaper than the average day, while Saturday is the most expensive, with prices 34% higher.

Find deals

Low season	February
High season	June
Cheapest flight	C$ 701

Beat the crowds with an average 76% drop in traveller numbers.

The most popular month to fly with an average 65% increase in traveller numbers.

Round-trip flight from Ottawa to St. Louis

When to book flights from Ottawa to St. Louis

Are your dates flexible? Find out the best times to travel from Ottawa to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Which cabin classes can I book on flights from Ottawa to St. Louis?
Only Economy Class is available on flights from Ottawa to St. Louis.
How long does a flight from Ottawa to St. Louis take?
There are currently no direct flights available from Ottawa to St. Louis. Flights with 1 layover take between 5h 32m and 6h 10m in total, depending on the connection.
Do I need a passport to fly from Ottawa to St. Louis?
Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.
How much should I expect to pay for a Ottawa to St. Louis flight?
Round-trip flights from Ottawa to St. Louis range from C$ 491 to C$ 814, with an average of C$ 649 over the past 12 months. Anything below C$ 491 counts as a good deal.
Have flight prices from Ottawa to St. Louis changed much recently?
Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about C$ 701 to C$ 1,847. That means the highest observed fare was about 3x higher than the lowest one.
What car rental options are available at Lambert-St Louis Airport (STL)?
Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates averaging C$ 109 for economy cars. Top options include:

• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless
Which airports can I use when flying from Ottawa to St. Louis?
Flights from Ottawa to St. Louis usually depart from Ottawa (YOW) and arrive at Lambert-St Louis (STL).
Which airports do connecting flights from Ottawa to St. Louis pass through?
One-stop flights from Ottawa to St. Louis most commonly connect through:

• Toronto Pearson Intl (YYZ) – 58% of one-stop connections
• Chicago O'Hare Intl (ORD) – 33% of one-stop connections
• Montreal Pierre Elliott Trudeau Intl (YUL) – 7% of one-stop connections
• Newark (EWR) – 2% of one-stop connections
Can I save money by using flexible dates for flights from Ottawa to St. Louis?
Yes. Flexible dates can save you up to 55% on flights from Ottawa to St. Louis. Tuesday is the cheapest departure day at C$ 399 round-trip on average, while Saturday is the most expensive at C$ 870, a difference of C$ 471.

KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.
How much time can I save by choosing a different layover airport when travelling from Ottawa to St. Louis?
Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 5h 32m, compared with 5h 40m via Toronto Pearson Intl (YYZ) and 5h 46m via Chicago O'Hare Intl (ORD).
What is the time difference between Ottawa and St. Louis?
St. Louis is 1 hour behind Ottawa (Central Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.
Which popular places can I visit in St. Louis?
Some of the most popular sights in St. Louis are Forest Park Hotel, Hyatt Regency St Louis At The Arch, and America's Center Convention Complex. These are among the most viewed places in St. Louis on KAYAK.

If your dates are flexible, aim for a Tuesday departure and avoid flying on Saturday. On this route, Tuesday flights average C$ 399, about C$ 471 less than Saturday fares (54% savings) based on the last 12 months.
If you can choose when to travel, plan your Ottawa to St. Louis trip for May. Fares historically average C$ 411 round-trip in that month – typically C$ 717 less than the most expensive month, which is August (based on the last 12 months).
If you're arriving late at night and need somewhere to stay, check out these hotels close to Lambert-St Louis Airport.

• Renaissance St. Louis Airport Hotel
• Drury Inn & Suites St. Louis Airport
• DoubleTree by Hilton St. Louis Airport

More options for your flight from Ottawa to St. Louis

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Vacations in St. Louis

YOW - STL

C$ 701 Find Cheap Flights from Ottawa to St. Louis – Compare and Save

Everything you should know

Cheap Flights from Ottawa to St. Louis (YOW-STL)

Recent round-trip flight deals from Ottawa to St. Louis

Recent one-way flight deals from Ottawa to St. Louis

Recent last minute flight deals from Ottawa to St. Louis

Price, demand, and travel trends for Ottawa to St. Louis flights

What's the cheapest day of the week to fly from Ottawa to St. Louis?

Which airline is the cheapest to fly from Ottawa to St. Louis?

What’s the most popular layover airport when flying from Ottawa to St. Louis?

What is the cheapest layover airport when flying from Ottawa to St. Louis?

When flying from Ottawa to St. Louis, which airport offers the shortest layover?

Key details for Ottawa to St. Louis flights

Low season

High season

Cheapest flight

When to book flights from Ottawa to St. Louis

Your Ottawa to St. Louis flight questions, answered

Your guide to booking Ottawa to St. Louis flights

More options for your flight from Ottawa to St. Louis

Complete your trip to St. Louis with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights from Ottawa to St. Louis

Find direct flights to and from Ottawa and St. Louis

Flights from domestic origins to St. Louis

Flights to other popular destinations