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 2022: compare Ottawa to St. Louis flight prices with the expected peak season, weather and rainfall in St. Louis.
YOW - STL
Price
C$ 225 - C$ 668
STL
Temperature
0 - 27 °C
STL
Rainfall
56 - 119 mm

Popular in

May

High demand for flights, 37% potential price rise

Cheapest in

January

Best time to find cheap flights, 47% potential price drop

Average price

C$ 416

Average for round-trip flights in August 2022

Round-trip from

C$ 289

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 day to fly round-trip from Ottawa to St. Louis?

Departing on a Thursday is a good option for securing a great price. You can expect to save up to 38% when planning your travel around this day of the week.

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

January is one of the best times of the year to fly to St. Louis from Ottawa. Prices for January average C$ 540 per person but you can even find prices for as low as C$ 287. The most expensive prices can be found in the month of May. Opting for a January flight can save you 58% on your journey compared to booking in May

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 20% on your trip compared to booking a flight at noon.

Cheap flights from Ottawa to St. Louis in August, September 2022

The best prices found for YOW to STL flights for August, September
2 Sep - 5 Sep
C$ 640pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa
31 Aug - 6 Sep
C$ 643pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa
31 Aug - 6 Sep
C$ 644pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa

Ottawa to St. Louis 2022 flight deals

Cheap flights to St. Louis from Ottawa found for this year
2 Sep - 5 Sep
C$ 640pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa
31 Aug - 6 Sep
C$ 643pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa
31 Aug - 6 Sep
C$ 644pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa

Cheap United Airlines flights from Ottawa to St. Louis

6 Oct - 8 Oct
C$ 690pp
YOW
Ottawa
United Airlines
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
   
2 STOPS
YOW
Ottawa
6 Oct - 8 Oct
C$ 719pp
YOW
Ottawa
United Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
   
2 STOPS
YOW
Ottawa
6 Sep - 11 Sep
C$ 825pp
YOW
Ottawa
United Airlines
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
YOW
Ottawa

Cheap Air Canada flights from Ottawa to St. Louis

31 Aug - 6 Sep
C$ 640pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa
31 Aug - 6 Sep
C$ 643pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa
31 Aug - 6 Sep
C$ 644pp
YOW
Ottawa
Air Canada
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Air Canada
 
1 STOP
YOW
Ottawa

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. Air Canada, United Airlines, and American Airlines are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Air Canada with this kind of flexibility.

Can I find flights from Ottawa to St. Louis for under C$ 700 on Cheapflights?

Yes, there are multiple flights from Ottawa to St. Louis for under C$ 700. The cheapest flight booked recently is on Air Canada for just C$ 640, but on average you can expect to pay C$ 730.

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

This flight path from Ottawa to Lambert-St Louis was viewed by 75 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?

Air Canada, at C$ 640, was found to be the cheapest airline from Ottawa to St. Louis.Alternate airlines to your destination round-trip include United Airlines and Delta.

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$ 616, our data indicates the cheapest price to be C$ 422. The most popular route (Ottawa - Lambert-St Louis), is priced around C$ 662.

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 United Airlines. Something to consider prior to booking your flight.

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 are not required to present a negative COVID-19 PCR test or antigen result upon entering 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) or Antigen (quick-test) test taken 72 hours for RT-PCR (NAAT) and 1 day for Antigen (quick-test) 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.

Top 4 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
Air Canada
C$ 282 C$ 634 No cancel fee 67%
Search Air Canada flights
WestJet
C$ 293 C$ 599 No cancel fee 60%
Search WestJet flights
American Airlines
C$ 302 C$ 466 No cancel fee 71%
Search American Airlines flights
United Airlines
C$ 315 C$ 713 No cancel fee 69%
Search United Airlines flights
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