Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

STL - YOW

$369 Find Cheap Flights from St. Louis to Ottawa

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 1/4. 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
0 bags

Search hundreds of travel sites at once for deals on flights to Ottawa

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Ottawa, 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 St. Louis to Ottawa, as well as popular online travel agencies
In the last 7 days travelers have searched 46,646,933 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

World’s Best Airfare Search Site for 2024

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

 
These are the cheapest deals for flights from St. Louis to Ottawa currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

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

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to Ottawa.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
11:45 am - 8:09 pmSTL-YOW
7h 24m1 stop
9:20 am - 11:28 pmYOW-STL
15h 08m1 stop
$400
Find Deal
Wed, Dec 18 - Tue, Dec 31
4:27 pm - 2:20 pmSTL-YOW
20h 53m2 stops
4:20 pm - 4:25 pmYOW-STL
25h 05m3 stops
$677
Find Deal
Sun, Dec 22 - Sun, Dec 29
12:00 pm - 2:20 pmSTL-YOW
25h 20m3 stops
7:20 pm - 9:06 pmYOW-STL
26h 46m3 stops
$679
Find Deal
Sun, Jan 5 - Sun, Jan 12
4:27 pm - 3:55 pmSTL-YOW
22h 28m2 stops
7:20 pm - 9:06 pmYOW-STL
26h 46m3 stops
$716
Find Deal
Sun, Jan 5 - Sun, Jan 12
4:27 pm - 3:12 pmSTL-YOW
21h 45m3 stops
4:20 pm - 4:25 pmYOW-STL
25h 05m3 stops
$726
Find Deal
Sun, Dec 22 - Sun, Dec 29
3:10 pm - 9:24 pmSTL-YOW
5h 14m1 stop
10:05 am - 3:06 pmYOW-STL
6h 01m1 stop
$808Air Canada
Find Deal
Sun, Dec 22 - Sun, Dec 29
1:05 pm - 9:24 pmSTL-YOW
7h 19m1 stop
6:20 am - 12:12 pmYOW-STL
6h 52m1 stop
$813Air Canada
Find Deal
Thu, Mar 20 - Sun, Mar 23
5:00 am - 10:01 pmSTL-YOW
16h 01m2 stops
6:20 am - 12:16 pmYOW-STL
6h 56m1 stop
$822United Airlines
Find Deal
Sun, Jan 5 - Sun, Jan 12
8:25 am - 6:54 pmSTL-YOW
9h 29m1 stop
6:00 am - 3:47 pmYOW-STL
10h 47m2 stops
$823United Airlines
Find Deal
Sun, Dec 22 - Sun, Dec 29
10:28 am - 12:10 amSTL-YOW
12h 42m2 stops
5:55 am - 9:35 pmYOW-STL
16h 40m2 stops
$1,077WestJet
Find Deal
Wed, Dec 18 - Mon, Dec 30

Flights from St. Louis to Ottawa - Travel Insights & Trends

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.

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

The average price of all flights from St. Louis to Ottawa clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from St. Louis to Ottawa, look for departures on Tuesdays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from Ottawa, Tuesday is the cheapest day to fly and Monday is the most expensive.

Good to know

Low season

April

High season

March

Cheapest flight

$369
Best time to beat the crowds with an average 54% drop in price.
Most popular time to fly and prices are also 9% 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 3 days, the lowest price for a flight from St. Louis to Ottawa was $369 for a one-way ticket and $400 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.

  • 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.

See more FAQs

Top airline 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.
7.0
Air CanadaOverall score based on 8246 reviews
6.8Entertainment
7.0Comfort
7.8Crew
7.3Boarding
6.2Food
Airline reviews

Republic was fine but Air Canada was terrible in the airport. They issues me a boarding pass that I placed in my wallet and then when I showed up at the airport they had taken the bar code away from the ticket because they changed the flight number even though the flight stayed the same time. This caused me to be unable to go through security and I had to go to Air Canada for help and they were horrible and almost caused me to miss my flight. Luckily I managed to get it figured out on my own phone, not the kiosks, or the agent I asked for help or the long line I was standing in!!

4.0 OkayShannon, Nov 2024EWR - YYZ
Read more Air Canada reviews

Republic was fine but Air Canada was terrible in the airport. They issues me a boarding pass that I placed in my wallet and then when I showed up at the airport they had taken the bar code away from the ticket because they changed the flight number even though the flight stayed the same time. This caused me to be unable to go through security and I had to go to Air Canada for help and they were horrible and almost caused me to miss my flight. Luckily I managed to get it figured out on my own phone, not the kiosks, or the agent I asked for help or the long line I was standing in!!

Unfortunately your planes need maintenance. I am surprised your bathroom in business class was not working in 8 hour flight. Coffee machine was broken. Seat adjustment panel was bad. I will stay away from Air Canada in future travel.

Problem with operation of on board entertainment computer. Failed about 1 /2 hour into the flight. Rebooting failed to restore.

Putting carryone size suitcase into the overhead luggage storage on a the small CR900 plane was cumbersome and its assignment to a far far gate w/o the moveable ramps at YYZ arrivals really stunk.

This flight was a lot more comfortable with more room than the Air Canada Rouge!!! We will never go rouge again! A yes to this one!!! It was so nice to have inflight entertainment! Also the carts came around twice for drinks or a snack!! Great experience all around!

AC flight attendants aren't overly friendly. Otherwise flight was fine.

I’m handicapped and the staff and crew were so kind and helped me board and made sure I was fine during the flight.

The people are great! The trip to Japan is simply never ending!!! Not the problem of the airlines, though.

Friendlier staff who are nice to the elderly who need assistance

Everything went very smoothly and the staff was courteous and friendly. I was really happy and pleased with how well the plane was flown because the departure, descent and landing were really smooth with no sudden drops. The plane’s interior was clean and nice and new in appearance.

Book cheap flights from St. Louis to Ottawa

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Ottawa found on KAYAK in the last 72 hours.
1/4Sat
1 stopAir Canada
6h 47mSTL-YOW
$369
1/4Sat
2 stopsUnited Airlines
20h 08mSTL-YOW
$390

Search by stops

Search by airline

Search by price

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

Information on your arrival and departure airports

Ottawa (YOW)
St. Louis (STL)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.