YOW - STL

C$ 345 Find Cheap Flights from Ottawa to St. Louis – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 615
Typical prices: C$ 485-C$ 734
Air Canada
Tue 23/10Tue 30/10
YOW - STL • 1 stop
Cheapest one-way flights
C$ 345
Typical prices: C$ 468-C$ 555
Air Canada
Mon 8/10
YOW - STL • 1 stop
Direct flights
Not available
There are currently no direct flights between Ottawa and St. Louis. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
May
Cheapest • 37% price drop
June
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Montreal Pierre Elliott Trudeau Intl (YUL)
Cheapest • Avg C$ 559 (round-trip)
Toronto Pearson Intl (YYZ)
Shortest trip • 5h 32m (one-way)
Insights
Insights
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We hope you enjoy your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

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

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

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

Fri, 23 Oct - Fri, 30 Oct
Air Canada Logo
2:35 p.m. - 6:41 p.m.YOW  Ottawa-STL Lambert-St Louis
5h 06m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
4:05 p.m. - 9:50 p.m.STL  Lambert-St Louis-YOW Ottawa
4h 45m1 stop Toronto Pearson Intl
C$ 615Air Canada
Fri, 16 Oct - Mon, 26 Oct
Air Canada Logo
2:50 p.m. - 6:41 p.m.YOW  Ottawa-STL Lambert-St Louis
4h 51m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
4:05 p.m. - 11:55 p.m.STL  Lambert-St Louis-YOW Ottawa
6h 50m1 stop Toronto Pearson Intl
C$ 615Air Canada
Thu, 15 Oct - Tue, 20 Oct
Air Canada Logo
2:50 p.m. - 6:41 p.m.YOW  Ottawa-STL Lambert-St Louis
4h 51m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
2:40 p.m. - 9:20 p.m.STL  Lambert-St Louis-YOW Ottawa
5h 40m1 stop Toronto Pearson Intl
C$ 620Air Canada
Thu, 1 Oct - Fri, 16 Oct
Air Canada Logo
2:50 p.m. - 6:41 p.m.YOW  Ottawa-STL Lambert-St Louis
4h 51m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
2:40 p.m. - 9:20 p.m.STL  Lambert-St Louis-YOW Ottawa
5h 40m1 stop Toronto Pearson Intl
C$ 674Air Canada
Fri, 23 Oct - Fri, 30 Oct
Multiple Airlines Logo
7:00 a.m. - 11:13 p.m.YOW  Ottawa-STL Lambert-St Louis
17h 13m1 stop Orlando
Multiple Airlines Logo
4:26 p.m. - 12:44 a.m.STL  Lambert-St Louis-YOW Ottawa
31h 18m2 stops Orlando Toronto Pearson Intl
C$ 718Multiple Airlines
Thu, 1 Oct - Fri, 16 Oct
United Airlines Logo
6:00 a.m. - 3:43 p.m.YOW  Ottawa-STL Lambert-St Louis
10h 43m3 stops Washington, D.C. Dulles Intl Indianapolis Chicago O'Hare Intl
United Airlines Logo
8:00 a.m. - 5:16 p.m.STL  Lambert-St Louis-YOW Ottawa
8h 16m1 stop Chicago O'Hare Intl
C$ 721United Airlines
Tue, 6 Oct - Tue, 13 Oct
United Airlines Logo
6:00 a.m. - 2:17 p.m.YOW  Ottawa-STL Lambert-St Louis
9h 17m3 stops Washington, D.C. Dulles Intl Indianapolis Chicago O'Hare Intl
United Airlines Logo
10:27 a.m. - 5:16 p.m.STL  Lambert-St Louis-YOW Ottawa
5h 49m1 stop Chicago O'Hare Intl
C$ 721United Airlines
Fri, 23 Oct - Fri, 30 Oct
United Airlines Logo
6:00 a.m. - 2:17 p.m.YOW  Ottawa-STL Lambert-St Louis
9h 17m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl
United Airlines Logo
9:40 a.m. - 9:59 p.m.STL  Lambert-St Louis-YOW Ottawa
11h 19m2 stops Chicago O'Hare Intl Newark
C$ 721United Airlines
Mon, 12 Oct - Sun, 18 Oct
Multiple Airlines Logo
6:50 a.m. - 11:13 p.m.YOW  Ottawa-STL Lambert-St Louis
17h 23m2 stops Toronto Pearson Intl Orlando
Multiple Airlines Logo
4:30 p.m. - 11:45 p.m.STL  Lambert-St Louis-YOW Ottawa
30h 15m1 stop Orlando
C$ 758Multiple Airlines
Fri, 16 Oct - Mon, 26 Oct
Delta Logo
6:50 a.m. - 4:28 p.m.YOW  Ottawa-STL Lambert-St Louis
10h 38m2 stops Toronto Pearson Intl Atlanta Hartsfield-Jackson
Delta Logo
2:25 p.m. - 12:44 a.m.STL  Lambert-St Louis-YOW Ottawa
9h 19m2 stops Atlanta Hartsfield-Jackson Toronto Pearson Intl
C$ 783Delta
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 from Ottawa to St. Louis with more confidence.

How much is a round-trip flight from Ottawa to St. Louis?

Round-trip flights from Ottawa to St. Louis start at C$ 615. Prices are typical for this route right now, with typical round-trip fares ranging from C$ 485 to C$ 734. The lowest price found in the past 5 days was C$ 615 on Air Canada.

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

Tuesday is the cheapest day of the week to fly from Ottawa to St. Louis and is 39% cheaper than the average day. Monday is the most expensive day with flight prices 35% higher than average. Based on deals found by KAYAK users in the last 12 months.

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Key details for Ottawa to St. Louis flights

Low season

February

Cheapest flight

C$ 345
Most popular time to fly and prices are also 11% lower on average.
Flights 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

Your Ottawa to St. Louis flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • 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) – 52% of one-stop connections
    • Chicago O'Hare Intl (ORD) – 38% of one-stop connections
    • Montreal Pierre Elliott Trudeau Intl (YUL) – 6% of one-stop connections
    • Newark (EWR) – 4% of one-stop connections

    Toronto Pearson Intl (YYZ) handles the largest share of one-stop connections on this route.

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

    Yes. Being flexible with your travel dates can save you up to 55% on the Ottawa to St. Louis route. Tuesday is the cheapest departure day at C$ 393 round-trip on average, while Monday is the most expensive at C$ 867, a difference of C$ 474. KAYAK's flexible dates feature shows options up to 3 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?

    A direct flight from Ottawa to St. Louis takes 0h 00m, covering 2,274 km.

  • 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$ 615 to C$ 1,797. That means the highest observed fare was about 3x higher than the lowest one.

  • How are flight prices from Ottawa to St. Louis looking right now?

    One-way fares from Ottawa to St. Louis are currently lower than usual. Average one-way flight prices are about C$ 402, which is 21% below the typical average for this route.

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

    Flying via Toronto Pearson Intl (YYZ) gives the shortest average 1-stop total travel time at 5h 32m, compared with 5h 32m via Montreal Pierre Elliott Trudeau Intl (YUL) and 6h 14m 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 starting from around C$ 42 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$ 485 to C$ 734, with an average of C$ 640 over the past 12 months. Anything below C$ 485 counts as a good deal.

Your guide to booking Ottawa to St. Louis flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Tuesday departure instead of Monday. On this route, Tuesday flights average C$ 393 – about C$ 474 less than Monday (55% 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$ 405 round-trip in that month – typically C$ 812 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.
    - Drury Inn & Suites St. Louis Airport
    - Renaissance St. Louis Airport Hotel
    - DoubleTree by Hilton St. Louis Airport

More options for your flight from Ottawa to St. Louis

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

Car rentals in St. Louis
Hotels in St. Louis
Vacations in St. Louis