STL - YOW

$306 Find Cheap Flights from St. Louis to Ottawa - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$502
Typical prices: $362-$709
Multiple Airlines
Mon 10/29Sat 12/1
STL - YOW • 1 stop
Cheapest one-way
$306
Typical prices: $178-$380
United Airlines
Sun 12/16
STL - YOW • 1 stop
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Ottawa. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
July
Cheapest • 33% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Toronto Pearson Intl (YYZ)
Cheapest • Avg $483 (round-trip)
Montreal Pierre Elliott Trudeau Intl (YUL)
Shortest trip • 5h 26m (one-way)
Insights
Insights
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Flight Deals

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

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

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

Thu, Oct 29 - Tue, Dec 1
Multiple Airlines Logo
4:26 pm - 4:44 pmSTL  Lambert-St Louis-YOW Ottawa
23h 18m1 stop Orlando
Multiple Airlines Logo
8:00 am - 12:41 amYOW  Ottawa-STL Lambert-St Louis
17h 41m1 stop Orlando
$502Multiple Airlines
Thu, Oct 29 - Tue, Dec 1
Multiple Airlines Logo
4:26 pm - 4:44 pmSTL  Lambert-St Louis-YOW Ottawa
23h 18m1 stop Orlando
Multiple Airlines Logo
4:35 pm - 7:09 amYOW  Ottawa-STL Lambert-St Louis
15h 34m2 stops Tampa Atlanta Hartsfield-Jackson
$510Multiple Airlines
Thu, Oct 29 - Thu, Nov 5
Multiple Airlines Logo
4:26 pm - 4:44 pmSTL  Lambert-St Louis-YOW Ottawa
23h 18m1 stop Orlando
Multiple Airlines Logo
8:00 am - 11:16 pmYOW  Ottawa-STL Lambert-St Louis
16h 16m1 stop Orlando
$532Multiple Airlines
Thu, Oct 29 - Thu, Nov 5
Multiple Airlines Logo
4:26 pm - 5:58 pmSTL  Lambert-St Louis-YOW Ottawa
24h 32m2 stops Orlando Toronto Pearson Intl
Multiple Airlines Logo
8:00 am - 11:16 pmYOW  Ottawa-STL Lambert-St Louis
16h 16m1 stop Orlando
$574Multiple Airlines
Thu, Oct 29 - Thu, Jul 1
Air Canada Logo
4:05 pm - 11:55 pmSTL  Lambert-St Louis-YOW Ottawa
6h 50m1 stop Toronto Pearson Intl
Air Canada Logo
9:05 am - 1:07 pmYOW  Ottawa-STL Lambert-St Louis
5h 02m1 stop Toronto Pearson Intl
$657Air Canada
Thu, Oct 1 - Tue, Oct 6
Air Canada Logo
8:55 am - 3:10 pmSTL  Lambert-St Louis-YOW Ottawa
5h 15m1 stop Toronto Pearson Intl
Air Canada Logo
2:50 pm - 6:41 pmYOW  Ottawa-STL Lambert-St Louis
4h 51m1 stop Montreal Pierre Elliott Trudeau Intl
$667Air Canada
Thu, Oct 1 - Tue, Oct 6
Air Canada Logo
8:55 am - 3:10 pmSTL  Lambert-St Louis-YOW Ottawa
5h 15m1 stop Toronto Pearson Intl
Air Canada Logo
2:50 pm - 6:41 pmYOW  Ottawa-STL Lambert-St Louis
4h 51m1 stop Montreal Pierre Elliott Trudeau Intl
$668Air Canada
Wed, Oct 28 - Sat, Oct 31
United Airlines Logo
9:59 am - 9:56 pmSTL  Lambert-St Louis-YOW Ottawa
10h 57m1 stop Newark
United Airlines Logo
3:10 pm - 10:54 pmYOW  Ottawa-STL Lambert-St Louis
8h 44m1 stop Newark
$671United Airlines
Fri, Oct 2 - Sun, Oct 4
United Airlines Logo
8:00 am - 5:16 pmSTL  Lambert-St Louis-YOW Ottawa
8h 16m1 stop Chicago O'Hare Intl
United Airlines Logo
6:00 am - 9:41 amYOW  Ottawa-STL Lambert-St Louis
4h 41m1 stop Washington, D.C. Dulles Intl
$671United Airlines
Thu, Oct 1 - Tue, Oct 6
United Airlines Logo
1:09 pm - 6:55 pmSTL  Lambert-St Louis-YOW Ottawa
4h 46m1 stop Washington, D.C. Dulles Intl
United Airlines Logo
2:52 pm - 9:21 pmYOW  Ottawa-STL Lambert-St Louis
7h 29m2 stops Washington, D.C. Dulles Intl Chicago O'Hare Intl
$680United Airlines
Booking Insights

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

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

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

Wednesday is the cheapest day of the week to fly from St. Louis to Ottawa, it is 26% cheaper than the average day. Friday is the most expensive day with flight prices 53% higher than average. Based on deals found by KAYAK users in the last 12 months.

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Key details for St. Louis to Ottawa flights

Low season

February

Cheapest flight

$306
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly and prices are also 33% lower on average.
Flight from St. Louis to Ottawa

When to book flights from St. Louis to Ottawa

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

Your St. Louis to Ottawa 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 St. Louis to Ottawa?

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

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

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

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

    One-stop flights from St. Louis to Ottawa most commonly connect through:

    • Toronto Pearson Intl (YYZ) - 61% of one-stop connections
    • Chicago O'Hare Intl (ORD) - 23% of one-stop connections
    • Montreal Pierre Elliott Trudeau Intl (YUL) - 13% of one-stop connections
    • Newark (EWR) - 3% 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 St. Louis to Ottawa?

    Yes. Being flexible with your travel dates can save you up to 52% on the St. Louis to Ottawa route. Wednesday is the cheapest departure day at $358 round-trip on average, while Friday is the most expensive at $739, a difference of $381. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in Ottawa?

    Some of the most popular sights in Ottawa are Garden of the Provinces and Territories, Nepean Sportsplex and National Arts Centre. These are among the most viewed places in Ottawa on KAYAK.

  • How long is a flight from St. Louis to Ottawa?

    A nonstop flight from St. Louis to Ottawa takes 0h 00m, covering 878 miles.

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

    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 St. Louis to Ottawa 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 $502 to $1,500. That means the highest observed fare was about 3x higher than the lowest one.

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

    One-way fares from St. Louis to Ottawa are currently higher than usual. Average one-way flight prices are about $408, which is 84% above the typical average for this route.

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

    Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 5h 26m, compared with 5h 33m via Toronto Pearson Intl (YYZ) and 5h 36m via Newark (EWR).

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

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

  • What car rental options are available at Ottawa Airport (YOW)?

    Ottawa Airport (YOW) hosts 5 major car rental companies, with daily rates starting from around $13 for economy cars. Top options include:
    • Routes Car & Truck Rentals
    • Europcar
    • Alamo
    • Budget
    • Enterprise Rent-A-Car

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

    Round-trip flights from St. Louis to Ottawa range from $362 to $709, with an average of $483 over the past 12 months. Anything below $362 counts as a good deal.

Your guide to booking St. Louis to Ottawa flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Wednesday departure instead of Friday. On this route, Wednesday flights average $358 - about $381 less than Friday (52% savings) based on the last 12 months.
  • If you can choose when to travel, plan your St. Louis to Ottawa trip for July. Fares historically average $322 round-trip in that month - typically $492 less than the most expensive month, which is November (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ottawa Airport.
    - Hilton Garden Inn Ottawa Airport
    - Hampton Inn by Hilton Ottawa Airport
    - Fairfield Inn & Suites by Marriott Ottawa Airport

More options for your flight from St. Louis to Ottawa

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

Car rentals in Ottawa
Hotels in Ottawa
Vacations in Ottawa