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 $503 round trip and CA $238 one way. Prices and availability subject to change. Additional terms may apply.

Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $503 Roundtrip, found 1 day ago
CA $503
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $503 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $547 Roundtrip, found 1 day ago
CA $547
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $547 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $560 Roundtrip, found 1 day ago
CA $560
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $560 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $567 Roundtrip, found 1 day ago
CA $567
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $567 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $570 Roundtrip, found 1 day ago
CA $570
Roundtrip
found 1 day ago
Select American Airlines flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $570 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $595 Roundtrip, found 1 day ago
CA $595
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $595 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $603 Roundtrip, found 1 day ago
CA $603
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $603 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $604 Roundtrip, found 1 day ago
CA $604
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $604 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $610 Roundtrip, found 1 day ago
CA $610
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $610 found 1 day ago
Fri, Nov 6 - Sun, Nov 8
IAD
Washington
STL
St. Louis
CA $615 Roundtrip, found 1 day ago
CA $615
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sun, Nov 8, priced at CA $615 found 1 day 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.