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 $1,000 round trip and CA $643 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Oct 17 - Sun, Oct 18
YOW
Ottawa
STL
St. Louis
CA $1,000 Roundtrip, found 5 days ago
CA $1,000
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Oct 17 from Ottawa to St. Louis, returning Sun, Oct 18, priced at CA $1,000 found 5 days ago
Sat, Oct 17 - Sun, Oct 18
YOW
Ottawa
STL
St. Louis
CA $1,087 Roundtrip, found 5 days ago
CA $1,087
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Oct 17 from Ottawa to St. Louis, returning Sun, Oct 18, priced at CA $1,087 found 5 days ago
Wed, Sep 2 - Wed, Sep 2
YOW
Ottawa
STL
St. Louis
CA $1,101 Roundtrip, found 2 days ago
CA $1,101
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Sep 2 from Ottawa to St. Louis, returning Wed, Sep 2, priced at CA $1,101 found 2 days ago
Wed, Sep 2 - Thu, Sep 3
YOW
Ottawa
STL
St. Louis
CA $1,106 Roundtrip, found 2 days ago
CA $1,106
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Sep 2 from Ottawa to St. Louis, returning Thu, Sep 3, priced at CA $1,106 found 2 days ago
Mon, Aug 31 - Tue, Sep 1
YOW
Ottawa
STL
St. Louis
CA $1,260 Roundtrip, found 2 days ago
CA $1,260
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Aug 31 from Ottawa to St. Louis, returning Tue, Sep 1, priced at CA $1,260 found 2 days ago
Mon, Aug 31 - Mon, Aug 31
YOW
Ottawa
STL
St. Louis
CA $1,261 Roundtrip, found 2 days ago
CA $1,261
Roundtrip
found 2 days ago
Select Air Canada flight, departing Mon, Aug 31 from Ottawa to St. Louis, returning Mon, Aug 31, priced at CA $1,261 found 2 days ago
Sat, Oct 17 - Sun, Oct 18
YOW
Ottawa
STL
St. Louis
CA $1,407 Roundtrip, found 5 days ago
CA $1,407
Roundtrip
found 5 days ago
Select WestJet flight, departing Sat, Oct 17 from Ottawa to St. Louis, returning Sun, Oct 18, priced at CA $1,407 found 5 days ago
Thu, Oct 29 - Mon, Nov 2
YOW
Ottawa
STL
St. Louis
CA $1,470 Roundtrip, found 1 day ago
CA $1,470
Roundtrip
found 1 day ago
Select WestJet flight, departing Thu, Oct 29 from Ottawa to St. Louis, returning Mon, Nov 2, priced at CA $1,470 found 1 day ago
Thu, Oct 29 - Mon, Nov 2
YOW
Ottawa
STL
St. Louis
CA $1,504 Roundtrip, found 22 hours ago
CA $1,504
Roundtrip
found 22 hours ago
Select WestJet flight, departing Thu, Oct 29 from Ottawa to St. Louis, returning Mon, Nov 2, priced at CA $1,504 found 22 hours ago
Thu, Oct 29 - Mon, Nov 2
YOW
Ottawa
STL
St. Louis
CA $1,539 Roundtrip, found 22 hours ago
CA $1,539
Roundtrip
found 22 hours ago
Select WestJet flight, departing Thu, Oct 29 from Ottawa to St. Louis, returning Mon, Nov 2, priced at CA $1,539 found 22 hours 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.