YOW - STL

$184 Find Cheap Flights from Ottawa to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ottawa to St. Louis departing on 1/30. 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

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$274
Typical prices: $455-$679
Multiple Airlines
Thu 1/22Sun 1/25
YOW - STL • 1 stop
Cheapest one-way
$184
United Airlines
Fri 1/30
YOW - STL • 1 stop
When to travel
November
Cheapest • 18% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to St. Louis 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 Ottawa to St. Louis

Thu, Jan 22 - Sun, Jan 25
Multiple Airlines Logo
4:20 pm - 11:33 pm
YOW
-
STL
8h 13m1 stop
Multiple Airlines Logo
5:42 pm - 5:13 pm
STL
-
YOW
22h 31m1 stop
$274Multiple Airlines
Thu, Jan 22 - Sun, Jan 25
Multiple Airlines Logo
4:20 pm - 11:33 pm
YOW
-
STL
8h 13m1 stop
Multiple Airlines Logo
5:42 pm - 12:42 am
STL
-
YOW
30h 00m2 stops
$297Multiple Airlines
Thu, Jan 8 - Mon, Jan 12
United Airlines Logo
5:11 pm - 10:58 pm
YOW
-
STL
6h 47m1 stop
United Airlines Logo
7:00 am - 1:32 pm
STL
-
YOW
5h 32m1 stop
$304United Airlines
Thu, Jan 8 - Mon, Jan 12
Air Canada Logo
6:00 am - 2:30 pm
YOW
-
STL
9h 30m2 stops
Air Canada Logo
8:05 am - 7:18 pm
STL
-
YOW
10h 13m2 stops
$364Air Canada
Mon, Jan 19 - Sat, Jan 24
United Airlines Logo
5:11 pm - 10:58 pm
YOW
-
STL
6h 47m1 stop
United Airlines Logo
6:30 am - 6:52 pm
STL
-
YOW
11h 22m2 stops
$426United Airlines
Mon, Jan 19 - Sat, Jan 24
American Airlines Logo
10:00 am - 8:32 pm
YOW
-
STL
11h 32m2 stops
American Airlines Logo
6:43 pm - 4:53 pm
STL
-
YOW
21h 10m2 stops
$478American Airlines
Mon, Jan 19 - Sat, Jan 24
United Airlines Logo
5:11 pm - 10:58 pm
YOW
-
STL
6h 47m1 stop
United Airlines Logo
8:05 am - 9:56 pm
STL
-
YOW
12h 51m2 stops
$506United Airlines
Mon, Jan 19 - Sat, Jan 24
Delta Logo
5:40 am - 4:37 pm
YOW
-
STL
11h 57m2 stops
Delta Logo
10:19 am - 12:42 am
STL
-
YOW
13h 23m2 stops
$517Delta
Booking Insights

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

Get data-powered insights and trends into flights from Ottawa to St. Louis 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 Ottawa to St. Louis?

The average price of all round-trip flights from Ottawa to St. Louis clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to St. Louis on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Monday is the most expensive day to fly from Ottawa to St. Louis. For your return ticket, we recommend flying on a Saturday and avoiding Mondays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to St. Louis, 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 Ottawa to St. Louis is November, where tickets cost $496 (return) on average. On the other hand, the most expensive months are August and May, where the average cost of round-trip tickets is $700 and $682 respectively.

Find deals

Good to know

Low seasonJune
Cheapest flight$184
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 12% increase in price.
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.

FAQs for booking flights from Ottawa to St. Louis

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

    In the last 3 days, the lowest price for a flight from Ottawa to St. Louis was $184 for a one-way ticket and $274 for a round-trip.

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

    Yes

  • Which airports will I be using when flying from Ottawa to St. Louis?

    Ottawa airport is called Ottawa and the only airport in St. Louis is Lambert-St Louis.

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

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

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

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

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

    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 Ottawa to St. Louis.

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

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

    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 St. Louis with an airline and back to Ottawa with another airline. Booking your flights between Ottawa and STL 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 Ottawa to St. Louis?

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

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

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to St. Louis. 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 Ottawa to St. Louis? 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.
7.1
Air CanadaOverall score based on 10531 reviews
6.3Food
7.8Crew
7.3Boarding
7.1Comfort
6.8Entertainment
Airline reviews

My seat was covered in vomit and I will be reaching out to Air Canada

2.0 MediocreAnonymous, Dec 2025
YYZ - MCO
Read more Air Canada reviews

My seat was covered in vomit and I will be reaching out to Air Canada

We were happy with the service and cost of checking a bag

It's kindof ridiculous that your system is even asking me about this since my flight was canceled and I wasn't rescheduled.

3 hr delay at the gate while they were doing maintenance. Next time, do not board passengers while maintenance is being performed

Digital check in is very poor with air canada compaired to other airlines

Baggage delayed we had to catch our cruise without any clothes 😒

Air Canada Rouge is great. Toronto Airport is the usual nightmare

Good but need to be better with the flight times.

The staff was great and made the long trip easy peasy!

The free Wi-fi for Aeroplan members was a great touch. The time passed quickly. I found the seats seemed a little closer together than I remember. Not Air Canada's fault, but we were about 20 minutes late landing because the airport was too busy. We had to circle around for a while. The boarding and disembarking went very smoothly.

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

Information on your arrival and departure airports

Ottawa (YOW)
St. Louis (STL)