STL - YOW

$206 Find Cheap Flights from St. Louis to Ottawa - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Ottawa departing on 9/14. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$437
Typical prices: $266-$327
Multiple Airlines
Thu 9/17Thu 9/24
STL - YOW • 1 stop
Cheapest one-way
$206
Multiple Airlines
Mon 9/14
STL - YOW • 3 stops
Top airlines
Cheapest • from $591 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Ottawa. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $515 (round-trip)
Shortest trip • 4h 37m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Ottawa!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Ottawa that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Thu, Sep 17 - Thu, Sep 24
Multiple Airlines Logo
5:19 pm - 2:33 pm-
20h 14m
Multiple Airlines Logo
7:00 am - 5:54 pm-
11h 54m
$437Multiple Airlines
Sat, Aug 29 - Sat, Sep 5
Multiple Airlines Logo
5:02 pm - 5:23 pm-
23h 21m
Multiple Airlines Logo
7:00 am - 4:11 pm-
10h 11m
$539Multiple Airlines
Fri, Aug 28 - Fri, Sep 4
Multiple Airlines Logo
6:17 pm - 4:20 pm-
21h 03m
Multiple Airlines Logo
7:00 am - 3:28 pm-
9h 28m
$581Multiple Airlines
Fri, Aug 28 - Fri, Sep 4
United Airlines Logo
7:25 am - 1:59 pm-
5h 34m
United Airlines Logo
6:25 am - 10:12 am-
4h 47m
$591United Airlines
Fri, Oct 16 - Sun, Oct 18
Multiple Airlines Logo
7:30 am - 10:35 pm-
14h 05m
Multiple Airlines Logo
10:00 am - 2:00 pm-
5h 00m
$591Multiple Airlines
Sat, Oct 10 - Mon, Oct 12
Air Canada Logo
12:10 pm - 7:45 pm-
6h 35m
Air Canada Logo
2:35 pm - 6:41 pm-
5h 06m
$597Air Canada
Tue, Sep 1 - Mon, Sep 7
Air Canada Logo
8:55 am - 3:10 pm-
5h 15m
Air Canada Logo
2:40 pm - 6:42 pm-
5h 02m
$602Air Canada
Fri, Sep 11 - Tue, Sep 15
Air Canada Logo
8:55 am - 3:10 pm-
5h 15m
Air Canada Logo
2:45 pm - 6:41 pm-
4h 56m
$602Air Canada
Fri, Sep 11 - Tue, Sep 15
United Airlines Logo
8:00 am - 5:16 pm-
8h 16m
United Airlines Logo
6:00 am - 9:39 am-
4h 39m
$605United Airlines
Fri, Sep 11 - Tue, Sep 15
United Airlines Logo
9:40 am - 9:35 pm-
10h 55m
United Airlines Logo
3:10 pm - 8:47 pm-
6h 37m
$605United Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Ottawa flights

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

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

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Ottawa departing in September.

Flight prices are below average for this route right now.

Flights to Ottawa from St. Louis usually cost between $472 and $704 in September.
The lowest price found in the past 5 days was $437 on Multiple Airlines (Sep 17-Sep 24).

What is the cheapest month to fly from St. Louis to Ottawa?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Ottawa, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Ottawa is January, where tickets cost $0 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $879 and $814 respectively.

Good to know

Low season

June

Cheapest flight

$206
Best time to beat the crowds with an average 60% drop in price.
Most popular time to fly and prices are also 3% 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
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.

FAQs for booking flights from St. Louis to Ottawa

  • What is the cheapest flight from St. Louis to Ottawa?

    In the last 5 days, the lowest price for a flight from St. Louis to Ottawa was $206 for a one-way ticket and $437 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Ottawa.

  • Which aircraft models fly most regularly from St. Louis to Ottawa?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Ottawa?

    Star Alliance is the only airline alliance operating flights between St. Louis and Ottawa.

  • Which is the best airline for flights from St. Louis to Ottawa, United Airlines or Air Canada?

    The two airlines most popular with KAYAK users for flights from St. Louis to Ottawa are United Airlines and Air Canada. With an average price for the route of $483 and an overall rating of 7.4, United Airlines is the most popular choice. Air Canada is also a great choice for the route, with an average price of $450 and an overall rating of 7.1.

  • How does KAYAK find such low prices on flights from St. Louis to Ottawa?

    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 St. Louis to Ottawa.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Ottawa?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ottawa from St. Louis 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 St. Louis to Ottawa?

    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 Ottawa with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and YOW can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Ottawa?

    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 Ottawa from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from St. Louis to Ottawa

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Ottawa. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Ottawa? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 10059 reviews
7.7Boarding
8.1Crew
7.1Entertainment
6.6Food
7.3Comfort
Airline reviews

Our flight was great with an unexpected upgrade. However, four days into our travel we are still without a piece of luggage. The bag tracker has not been accurate, the airline is not communicating with me or the luggage delivery service and no one is willing to take responsibility or guarantee any kind of support or reimbursement. Unfortunately, we do not have the option to easily shop to replace items as we are currently on a cruise. I have been very disappointed by United Airlines response.

6.0 GoodValerie, Jul 2026
Read more United Airlines reviews

Our flight was great with an unexpected upgrade. However, four days into our travel we are still without a piece of luggage. The bag tracker has not been accurate, the airline is not communicating with me or the luggage delivery service and no one is willing to take responsibility or guarantee any kind of support or reimbursement. Unfortunately, we do not have the option to easily shop to replace items as we are currently on a cruise. I have been very disappointed by United Airlines response.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

Very nice flight love the small aircraft. We had a wonderful flight attendant. Nice to see someone that really enjoys her job. Don't have her name but had a southern accent.

Seats in waiting area and on plane hard as rock. Fast internet on the flight was great! Crew was kind.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

I do prefer to fly United and have always had excellent service, except for bad weather. Flights are on time and staff is alway curtious and helpful

Aircraft has better leg room than any of United's larger planes. We had requested mobility assistance for this and related flights. United's response to all was superb.

Onboarding - it would be great to see on the screen what group they were boarding. It was very confusing on who was boarding (even though they called it out) they were not clear and the space to board was strange.

The flight was on time and the crew were great.

Good but I don’t received my bags yet is been 5days still no update

It was a short flight so, everything went smoothly and we got to where we needed to be safely.

This flight didn't happen for me because of overbooking.

Everything was simple and easy. The lady at the gate was super friendly, I wish I had her name to share. She's a little older, dark-haired. You can tell she likes her job and would be a great influence on any young people training with her.

Your survey should include a "Not Applicable" response for those elements that were not utilized, such as food (unless your want me to rate the cookie I received) and the entertainment (unless you want me to rate the emergency landing presentation). Boarding was late, the plane took-off almost an hour late, and the gate to board changed five times while I was waiting there. At 1:00 pm the plane had not yet approached the gate for passengers to load, yet the information board indicated that the take-off would be 12:30 pm and its status was "on time". Curious.

Friendlier staff who are nice to the elderly who need assistance

Service was great. Flight was delayed an hour which made our connection very tight and stressful. But we fortunately made it.

There was a mistake with the first name we only discovered at security. Air canada was unable to correct it to match then passport since it was booked through an agency. The agency could not correct it either since they need at least two hours to do that. We could not fly and lost a bunch of money. Learned my lesson about kayak.

I appreciate the fact that the flight took off and landed on time What I didn’t like they never offer a snack eg nuts/cookies/chips

Not cancelled the flight I had to rebook with another airline

Everything you need to know for your flight from St. Louis to Ottawa

Information on your arrival and departure airports