Flights from St Louis to Washington

Flight deals from St Louis to Washington

Looking for a cheap last-minute deal or the best roundtrip flight from St Louis to Washington? If you want to travel next month, roundtrip fares start from $4,689. Find the lowest prices on one-way and roundtrip tickets right here.

Seattle.$4,689 per passenger.Departing Tue, Jun 23, returning Wed, Jun 24.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jun 23, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Wed, Jun 24, arriving in St Louis.Price includes taxes and charges.From $4,689, select.

Spokane.$5,401 per passenger.Departing Thu, Jun 11, returning Wed, Jun 17.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from St Louis on Thu, Jun 11, arriving in Spokane International.Inbound indirect flight with Frontier Airlines, departing from Spokane International on Wed, Jun 17, arriving in St Louis.Price includes taxes and charges.From $5,401, select.

Pasco.$7,386 per passenger.Departing Wed, Jul 1, returning Wed, Jul 8.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from St Louis on Wed, Jul 1, arriving in Pasco.Inbound indirect flight with Delta, departing from Pasco on Wed, Jul 8, arriving in St Louis.Price includes taxes and charges.From $7,386, select.

Bellingham.$8,245 per passenger.Departing Sat, Jun 27, returning Fri, Jul 3.Round-trip flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Jun 27, arriving in Bellingham.Inbound indirect flight with Allegiant Air, departing from Bellingham on Fri, Jul 3, arriving in St Louis.Price includes taxes and charges.From $8,245, select.

Wenatchee.$10,734 per passenger.Departing Thu, Jun 25, returning Wed, Jul 1.Round-trip flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departing from St Louis on Thu, Jun 25, arriving in Wenatchee.Inbound indirect flight with Alaska Airlines, departing from Wenatchee on Wed, Jul 1, arriving in St Louis.Price includes taxes and charges.From $10,734, select.

Pullman.$11,202 per passenger.Departing Fri, Jun 26, returning Thu, Jul 2.Round-trip flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departing from St Louis on Fri, Jun 26, arriving in Pullman.Inbound indirect flight with Alaska Airlines, departing from Pullman on Thu, Jul 2, arriving in St Louis.Price includes taxes and charges.From $11,202, select.

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Flying from St Louis to Washington

Arm yourself with these facts on the fly.

Cheapest flight found	$4,689
Cheapest month to fly	June
Average flight time	4 hrs, 28 mins
Cheapest airport to fly from	St Louis
Most popular airline	Alaska Airlines

How to find cheap flights from St Louis to Washington

We've compared the best online travel agents and flight providers on the Internet to find the cheapest plane tickets from St Louis to Washington. Other savvy travelers recently found round-trip flights from $4,689 and one-way tickets from $2,418. Ready to join them? Here are a few tips to help you do it the smart way.

Fly from St Louis into Seattle / Tacoma International

At the moment, the lowest-priced flight tickets to Washington are from St Louis Airport to Seattle / Tacoma International Airport.

Fly in June

We crunched the flight calendar and found the cheapest time to fly from St Louis to Washington is currently June.

Flex your dates for the best rates

If you’re flexible on your departure dates, you can use Skyscanner's whole month tool to find the cheapest day of the year to fly from St Louis to anywhere you choose in Washington.

Watch as flight prices go up and down

With Price Alerts, we'll let you know when flight prices from St Louis to Washington go up or down so you can book when the time is just right.

Relax – these are fee-free plane tickets

With us, there are no added fees – the Washington to Washington flight price you see when you search with us is what you pay to the provider.

Frequently asked questions

What's the average St Louis to Washington flight price?

We looked at all of the upcoming round-trip flights from St Louis to Washington we could find over the next 12 months. It looks like $4,689 is the best price. This is good, compared to the average Washington ticket price of $7,943.

What is the cheapest month to fly from St Louis to Washington?

The cheapest month to fly from St Louis to Bellingham Airport is usually June. The cheapest month to fly from St Louis to Seattle / Tacoma International Airport is usually June. The cheapest month to fly from St Louis to Pasco Airport is usually July. And the cheapest month to fly from St Louis to Wenatchee Airport is usually June.

On which upcoming date is it cheapest to fly from St Louis to Washington?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from St Louis to Washington on Tuesday, June 23, 2026.

Are there any direct flights from St Louis to Washington?

St Louis Airport offers direct flights to Washington.

If I'm flying from St Louis, where in Washington is cheapest to fly to?

If you're flying from St Louis, the cheapest city in Washington to fly into is Seattle. The cheapest airport serving Seattle at the moment is Seattle / Tacoma International.