Cheap Flights From Macdonald-Cartier Intl. (YOW) To Lambert-St. Louis Intl. (STL)

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Cheapest Flights from Ottawa (YOW) to St. Louis (STL)

The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were CA $1,025 round trip and CA $553 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,025 Roundtrip, found 3 days ago
CA $1,025
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,025 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,031 Roundtrip, found 3 days ago
CA $1,031
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,031 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,055 Roundtrip, found 3 days ago
CA $1,055
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,055 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,066 Roundtrip, found 3 days ago
CA $1,066
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,066 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,073 Roundtrip, found 3 days ago
CA $1,073
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,073 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,094 Roundtrip, found 3 days ago
CA $1,094
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,094 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,096 Roundtrip, found 3 days ago
CA $1,096
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,096 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,108 Roundtrip, found 3 days ago
CA $1,108
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,108 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,125 Roundtrip, found 3 days ago
CA $1,125
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,125 found 3 days ago
Tue, Oct 27 - Wed, Oct 28
YOW
Ottawa
STL
St. Louis
CA $1,130 Roundtrip, found 3 days ago
CA $1,130
Roundtrip
found 3 days ago
Select Porter Airlines flight, departing Tue, Oct 27 from Ottawa to St. Louis, returning Wed, Oct 28, priced at CA $1,130 found 3 days ago

Frequently asked questions

What airlines fly from Ottawa Intl. Airport to STL?
Unfortunately, you won't find any airlines that fly straight from Macdonald-Cartier Intl. Airport (YOW) to St. Louis Lambert International Airport. But don't let that small detail stop you. Use any layover as an opportunity to check out the local fare, stretch your legs and potentially discover a new city to explore further one day.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.