Cheap flights from Ottawa to St. Louis

Round-trip
Economy
Ottawa (YOW)
St. Louis (STL)
Depart
Return
Any month
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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$ 208 - C$ 500
STL
Temperature
0 - 27 °C
STL
Precipitation
56 - 119 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

Average price

C$ 355

Average for round-trip flights in November 2021

Round-trip from

C$ 264

From Ottawa to Lambert-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 month to fly from Ottawa to St. Louis?

April is one of the best times of the year to fly to St. Louis from Ottawa. Prices for April average C$ 376 per person but you can even find prices for as low as C$ 263. The most expensive prices can be found in the month of October. Opting for a April flight can save you 68% on your journey compared to booking in April

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

A simple way to save on the total cost of your ticket is to fly from Ottawa to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 27% on your trip compared to booking a flight at noon.

What is the cheapest day to fly round-trip from Ottawa to St. Louis?

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 49% when planning your travel around this day of the week.

Cheap flights from Ottawa to St. Louis in November, December 2021

The best prices found for YOW to STL flights for November, December
28 Dec - 31 Dec
C$ 741pp
YOW
Ottawa
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
YOW
Ottawa
28 Dec - 31 Dec
C$ 756pp
YOW
Ottawa
Multiple Airlines
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
YOW
Ottawa
27 Dec - 30 Dec
C$ 780pp
YOW
Ottawa
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
     
3 STOPS
YOW
Ottawa

Ottawa to St. Louis 2022 flight deals

Cheap flights to St. Louis from Ottawa found for next year
28 Dec - 31 Dec
C$ 741pp
YOW
Ottawa
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
YOW
Ottawa
28 Dec - 31 Dec
C$ 756pp
YOW
Ottawa
Multiple Airlines
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
YOW
Ottawa
27 Dec - 30 Dec
C$ 780pp
YOW
Ottawa
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Multiple Airlines
     
3 STOPS
YOW
Ottawa

One-way flights to Lambert-St Louis from Ottawa

The cheapest one-way flights from Ottawa to St. Louis
3:15 p.m. - 4:52 p.m.
WestJet
2 stops
26h 37m
YOW - STL
WestJet
C$ 483
WestJet
2:40 a.m. - 2:22 p.m.
United Airlines
1 stop
12h 42m
YOW - STL
United Airlines
C$ 808
United
7:50 a.m. - 4:48 a.m.
Multiple Airlines
3 stops
21h 58m
YOW - STL
Multiple Airlines
C$ 1,268
Kiwi.com

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

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.

Can I find flights from Ottawa to St. Louis for under C$ 800 on Cheapflights?

Yes, there are multiple flights from Ottawa to St. Louis for under C$ 800. The cheapest flight booked recently is on Multiple Airlines for just C$ 741, but on average you can expect to pay C$ 884.

How popular is this Ottawa to St. Louis flight route?

This flight path from Ottawa to Lambert-St Louis was viewed by 69 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

WestJet, at C$ 831, was found to be the cheapest airline from Ottawa to St. Louis. An alternate airline flying to your destination would be United Airlines.

What are the most popular airlines that fly from Ottawa to St. Louis?

The most popular airlines flying from Ottawa to St. Louis are American Airlines, Air Canada and Delta. Something to consider prior to booking your flight.

What are the cheapest flights from Ottawa to St. Louis?

Looking for the cheapest flight from Ottawa to St. Louis? While on average our users pay C$ 241, our data indicates the cheapest price to be C$ 222. The most popular route (Ottawa - Lambert-St Louis), is priced around C$ 780.

COVID Restrictions

View COVID Travel Restrictions for St. Louis, MO

Do I need a COVID test to fly to St. Louis from Ottawa?

Information is based on travel restrictions from Ottawa to Lambert-St Louis

Most visitors from Ottawa need to provide a negative COVID-19 test result and/or quarantine to enter Lambert-St Louis.

COVID-19 testing requirements
Visitors from Ottawa must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from Ottawa are not required to quarantine after entering Lambert-St Louis.

Do I need a test to fly back to Ottawa from St. Louis?

Returning to Ottawa from Lambert-St Louis

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) test taken 72 hours before departing to Ottawa.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Ottawa.

Hide COVID Travel Restrictions for St. Louis, MO

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 = $0.79
Average temperature for November in St. Louis
14.0 °C
Avg rainfall for November in St. Louis
86.0 mm

Airports servicing Ottawa

Airports servicing St. Louis

Top 5 airlines flying from Ottawa to Lambert-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$ 198 C$ 395 No cancel fee 60%
Search WestJet flights
Delta
C$ 243 C$ 459 No cancel fee N/A
Search Delta flights
American Airlines
C$ 299 C$ 461 No cancel fee 71%
Search American Airlines flights
United Airlines
C$ 334 C$ 550 No cancel fee 69%
Search United Airlines flights
Air Canada
C$ 361 C$ 507 No cancel fee 67%
Search Air Canada flights
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