Cheap Flights From Washington Dulles Intl. (IAD) To Lambert-St. Louis Intl. (STL)

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Cheapest Flights from Washington (IAD) to St. Louis (STL)

The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were CA $549 round trip and one way. Prices and availability subject to change. Additional terms may apply.

Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $549 Roundtrip, found 4 hours ago
CA $549
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $549 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $565 Roundtrip, found 4 hours ago
CA $565
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $565 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $660 Roundtrip, found 4 hours ago
CA $660
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $660 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $675 Roundtrip, found 4 hours ago
CA $675
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $675 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $731 Roundtrip, found 4 hours ago
CA $731
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $731 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $759 Roundtrip, found 4 hours ago
CA $759
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $759 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $774 Roundtrip, found 4 hours ago
CA $774
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $774 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $775 Roundtrip, found 4 hours ago
CA $775
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $775 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $795 Roundtrip, found 4 hours ago
CA $795
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $795 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $817 Roundtrip, found 4 hours ago
CA $817
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $817 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $832 Roundtrip, found 4 hours ago
CA $832
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $832 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $838 Roundtrip, found 4 hours ago
CA $838
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $838 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $843 Roundtrip, found 4 hours ago
CA $843
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $843 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $869 Roundtrip, found 4 hours ago
CA $869
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $869 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $880 Roundtrip, found 4 hours ago
CA $880
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $880 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $883 Roundtrip, found 4 hours ago
CA $883
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $883 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $900 Roundtrip, found 4 hours ago
CA $900
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $900 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $907 Roundtrip, found 4 hours ago
CA $907
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $907 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $912 Roundtrip, found 4 hours ago
CA $912
Roundtrip
found 4 hours ago
Select Delta flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $912 found 4 hours ago
Fri, Dec 4 - Sun, Dec 6
IAD
Washington
STL
St. Louis
CA $917 Roundtrip, found 4 hours ago
CA $917
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Fri, Dec 4 from Washington to St. Louis, returning Sun, Dec 6, priced at CA $917 found 4 hours ago

Frequently asked questions

Are there direct flights from IAD to Lambert-St. Louis Intl. Airport (STL)?
For a no-fuss trip between Sterling and St. Louis, take a look at United Airlines. They offer direct flights from Dulles Intl. Airport to STL.
What airlines fly from IAD to STL?
Ready to book the ticket for your next incredible adventure? Eager to travel from IAD to Lambert Field as fast as possible? Step aboard one of the 91 nonstop flights offered by United Airlines each month, and you'll be landing before you can ask 'Are we there yet?'
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.