Cheap flights from Ottawa to St Louis

Round-trip
Economy
Ottawa (YOW)
St. Louis (STL)
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How to find the cheapest flight from
Ottawa (YOW) to St Louis (STL)

All the information you need to plan the best YOW to STL flight in 2021: compare Ottawa to St Louis flight prices with the expected peak season, weather and rainfall in St Louis.
YOW - STL
Price
C$ 263 - C$ 632
STL
Temperature
7 - 32 °C
STL
Rainfall
57 - 130 mm

Popular in

October

High demand for flights, 41% potential price rise

Cheapest in

April

Best time to find cheap flights, 30% potential price drop

Round-trip from

C$ 263

From Ottawa to St Louis

One-way from

C$ 282

One-way flight from Ottawa to St Louis

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Ottawa to St Louis?

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 49% on the overall cost on flights from Ottawa to St Louis.

How far in advance should I book a flight from Ottawa to St Louis?

To save up to 26% on this flight, we recommend booking at least 39 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ottawa to St Louis from C$ 575 1-2 weeks out and tickets from C$ 686 for flights departing within the next 72 hours.

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

The best pricing can be found in the month of February. Prices to St Louis from Ottawa average C$ 541. You can even find prices in February for less than C$ 541, as users have found deals to St Louis from as low as C$ 217. The month of June appears to be one of the more expensive times to travel to St Louis from Ottawa. Flying in the targeted month can save you up to 29%.

When is the cheapest time to fly from Ottawa to St Louis (YOW - STL)?

When flying from Ottawa to St Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 27% versus a flight at noon.

Cheap flights from Ottawa to St Louis in July, August 2021

The best prices found for YOW to STL flights for July, August
24 Aug - 8 Sep
C$ 406pp
YOW
Ottawa
Air Canada
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
   
2 STOPS
YOW
Ottawa
21 Aug - 5 Sep
C$ 463pp
YOW
Ottawa
Air Canada
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
   
2 STOPS
YOW
Ottawa
16 Aug - 31 Aug
C$ 602pp
YOW
Ottawa
Air Canada
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
   
2 STOPS
YOW
Ottawa

Ottawa to St Louis 2021 flight deals

Cheap flights to St Louis from Ottawa found for this year
28 Sep - 29 Sep
C$ 398pp
YOW
Ottawa
Air Canada
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
   
2 STOPS
YOW
Ottawa
28 Sep - 29 Sep
C$ 402pp
YOW
Ottawa
Air Canada
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
   
2 STOPS
YOW
Ottawa
24 Aug - 8 Sep
C$ 406pp
YOW
Ottawa
Air Canada
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
   
2 STOPS
YOW
Ottawa

One-way flights to St Louis from Ottawa

The cheapest one-way flights from Ottawa to St Louis
6:00 a.m. - 11:47 a.m.
Air Canada
2 stops
30h 47m
YOW - STL
Air Canada
C$ 282
2:00 a.m. - 11:47 a.m.
United Airlines
2 stops
10h 47m
YOW - STL
United Airlines
C$ 415
United
1:45 a.m. - 12:09 p.m.
Multiple Airlines
3 stops
11h 24m
YOW - STL
Multiple Airlines
C$ 2,039
United

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Ottawa</span> to <span class="emphasized">St Louis</span> flights.

Flight FAQs

From Ottawa to St Louis

Can I find flights from Ottawa to St Louis for under C$ 506 on Cheapflights?

Yes, there are multiple flights from Ottawa to St Louis for under C$ 506. The cheapest flight booked recently is on Air Canada for just C$ 398, but on average you can expect to pay C$ 576.

Which airlines flying from Ottawa to Lambert-St Louis have flexible cancellations due to COVID-19?

Some of our airline partners flying from Ottawa to Lambert-St Louis have new flexible policies in place due to COVID-19. WestJet, Air Canada, and Delta are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like WestJet with this kind of flexibility.

Are there direct flights from Ottawa to St Louis for under C$ 379 on Cheapflights?

There are no direct flights from Ottawa to St Louis, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Does it rain more in Ottawa or St Louis?

When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Ottawa is roughly similar to St Louis. You can assume this to be the case over the next 18 days.

Is Ottawa weather warmer or cooler than St Louis?

With an average temperature of 32 °C, peak weather can be found in July. As a traveller, expect to see changes in flight prices during that period. The temperatures in St Louis are hotter than in Ottawa.

How long is the flight from Ottawa to St Louis?

For as low as C$ 2,159, United Airlines can have you in St Louis from Ottawa in 4h 42m. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines to flying from Ottawa to St Louis round-trip?

Currently priced at C$ 398, Air Canada will fly you from Ottawa to St Louis and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Delta - these airlines can fly you to your destination from C$ 476 and C$ 1,054, respectively.

What are the cheapest airlines to fly from Ottawa to St Louis one-way?

For one-way options, check prices for Air Canada. According to our data, you can fly for as low as C$ 252. Users have also found tickets on United Airlines for as little as C$ 415.

Alternative routes for Ottawa to St Louis

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for St Louis

Things to know before you go - useful duration and weather info for your trip from Ottawa to St Louis.
Today's exchange rate
C$ 1 = $0.80
Average temperature for July in St Louis
32.0 °C
Avg rainfall for July in St Louis
101.0 mm

Airports servicing Ottawa

Airports servicing St. Louis

Top 5 airlines flying from Ottawa to St Louis

The chart below displays the airlines Cheapflights users travelling from Ottawa to St Louis choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
WestJet
C$ 156 C$ 311 No cancel fee 60%
Search WestJet flights
Delta
C$ 191 C$ 361 No cancel fee N/A
Search Delta flights
American Airlines
C$ 235 C$ 363 No cancel fee 71%
Search American Airlines flights
Air Canada
C$ 284 C$ 399 No cancel fee 67%
Search Air Canada flights
United Airlines
C$ 263 C$ 433 No cancel fee 69%
Search United Airlines flights
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