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Find cheap flights from St. Louis to Washington from $85

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Washington departing on 5/17. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
vie. 5/31
vie. 6/7

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Best Washington Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Seattle
Seattle1 stop$139
Spokane
Spokane1 stop$294
Pasco
Pasco1 stop$597
Portland
Portland1 stop$85

Good to know

Low season

January

High season

June

Cheapest flight

$85
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from St. Louis to Seattle

FAQs - booking Washington flights

  • How does KAYAK find such low prices on flights from St. Louis to Washington?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Washington.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Washington?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Washington?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington with an airline and back to St. Louis with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Washington?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Washington

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to the following destinations at these prices or less: Seattle $248 one-way - $461 round-trip
  • Morning departure is around 46% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from St. Louis to Washington

 
Need help choosing which airline to fly with from St. Louis to Washington? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10895 reviews
7.9Comfort
7.4Food
8.0Entertainment
8.2Boarding
8.6Crew
Airline reviews

Delta is one of the best airlines I have flown

10.0 ExcellentKellie, Apr 2024ANC - SEA
Read more about Delta reviews

Delta is one of the best airlines I have flown

Flight delayed about 2 hrs so it made it a VERY late night

Standard economy seats on Deltas 767 were better than Alaska premium seats on their 737 MAX9; more legroom, wider seats. Entertainment was great, no ipad or phone required. Could have included a meal service.

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

The plane smelled like a sewer. Multiple passengers complained. It’s a safety and quality issue to clean these planes.

The boarding process was terrible especially with an indirect flight Chicago to Seattle to San Diego was terrible talking about we overbooked a flight idk if I’d take this airline ever again we got off our flight from Chicago to Seattle and we traveled for business and they told us our connecting flight was over booked and their was no seats asking people to take a delayed next flight and they don’t tell anyone coughing to wear masks seats 30A-B were terrible during the flight no one wants to sit next to people coughing all around I don’t want to be sick traveling for work or get sick anytime it’s very upsetting the staff doesn’t take this stuff serious to tell them to wear masks when they see people coughing and sneezing

Flight was on time, the crew was personable & professional, & the plane arrived early which was nice.

This flight landed early, but deplaned late. We were stuck sitting and waiting for a gate for over an hour

My flight was very clean and the location was comfortable. The service was great. A satisfying flight!

I appreciated being upgraded. I was very disappointed with my 13 hr layover in Seattle to geg, while my friends who flew Alaska made it home as scheduled. I had to reserve a hotel on my dime.

The overall flight went well and the aircrew was pleasant.

Very comfortable Prem economy seats for a long haul flight. Had a problem with the tv that the crew fixed so was great!

Cathay Pacific seems to be an airline in trouble and on its way out. Lots of broken or poorly functioning things like entertainment screens, seats, and enough well trained staff to handle a full flight. Sad...

The flight crew was exceptionally good. Personal needs were well met. The food choices were very nice.

Excellent. Planes are a little older and could get some refurbishment, but besides that everything was excellent.

While I was in great pain, the seat was sufficiently comfortable to allow me to rest and not be in so much pain.

we were upgraded which was a blessing and tender mercy for us. I fell the day before and was in extreme pain from knee to shoulder. Sitting in a more comfortable seat during the flight was an unexpected blessing and experience.

Seats were very comfortable. Crew were excellent. Food very good.

Flight crew was especially thoughtful and attentive, made sure our seats were comfortable so we could rest on the long flight

I felt thirsty and asked the flight attendent for water, but no one came for more than half an hour.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

All flights were on time and boarding was issue free

Terrible! The plane was old and you are required to connect your own device to their Wi-Fi rather than have entertainment options in the back of the seat in front of you. The Wi-Fi went out during the flight and there was only one plug for the devices every two seats. Three out of five surrounding my family did not work. The seats and spaces under them were so small I could not fit my backpack, which I’ve always brought on flights and fit before no problem. The crew were unpleasant and patronizing.

Great! The plane was decently sized and comfortable. The staff was nice and there was great in flight entertainment

Water service would be great. The way they board is terrible. Slow passengers first😂😂 They need to smart up a bit

Our original business class flight was cancelled so we not only downgraded but we were also spread out across the plane not sitting together in separate middle seats. My poor kids were scared and couldn’t see me on the flight and the crew wasn’t sensitive to the situation and what the airlines did to us. Very dissatisfied with United airlines.

Crew were fine, drinks and snacks were as well but we were delayed for around 2 hrs which made our entry into Mexico delayed as well with the influx of arrivals at the same time. Sort of wasted our first day of vacation. We left Pittsburgh at 630am and did not arrive in Mexico until late dinner time.

There was a group of school age passengers that were very loud and unruly with their chaperones were no where to be found.

Boarding was unorganized. They expected passengers to ask people to move their assigned seat they paid for in order to sit together. The seats even in comfort are smaller than other airlines and the flight attendants appeared not to be well prepared

The WiFi didn’t work and the seats are too close together. Very uncomfortable.

Not being able to purchase my check in baggage online was a negative.

LATE LATE LATE!!! Plagued by late AA flights on this trip. Such a drag. This one was by far the worst.

WiFi connected but only let you go to the AA website, not even text messaging worked.

Too bad that first class seats do not recline significantly causing discomfort

Flight delayed over an over all day until it cancelled at 1:30am. Would not repeatedly delay that late. Offer hotel rooms and rebook early. Very difficult for families with small children

this is starting to seem like an american airlines standard. delayed flights and fake apologies… getting tired of it

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

The guy with severe body odor sat next to me. For the whole duration of the flight it was a torture. The airline should have better policy on limiting people with bad body odor to board the flight. Passengers should not be the ones to endure bad odor for the whole duration of the flight. The airline should be e the one to ensure decent air quality for ever passenger.

Overall it was a miserable experience... I will never fly spirit for more than a 3 hour flight or overnight.

The boarding attendant was slightly rude when I asked about checking our stroller. Made me feel like I was bothering her.

My wife and I are both handicapped and at boarding they upgraded us to a seat closer to the front rather than all the way towards the back. Much appreciated.

Not much seat room, but that was unexpected. But the seat headrest was very uncomfortable.

First the good, everyone was friendly and efficient. Flight was smooth and plane was very clean and new. Now the bad, seats have almost no padding on your behind. I was in exit row so I had tons of leg room for a 6' 2" bean pole with long legs. Everything was extra - water, soda, snacks everything besides oxygen. Ya get what you pay for, and my flight was cheap as you could ever want it, so no worries.

First the good, everyone was friendly and efficient. Flight was smooth and plane was very clean and new. Now the bad, seats have almost no padding on your behind. I was in exit row so I had tons of leg room for a 6' 2" bean pole with long legs. Everything was extra - water, soda, snacks everything besides oxygen. Ya get what you pay for, and my flight was cheap as you could ever want it, so no worries. They dont really bother you about carry-on size, I brought a descent sized backpack and they didnt even check.

Spirit canceled the flight in March and never notified me!

Seats suck, not enough room, overcrowded planes, hectic situation all together.

Pretty good. Would’ve been excellent if we would have left on time and the crew wasn’t late.

Book cheap flights from St. Louis to Washington

Recent round-trip flight deals

5/20lun.
1 stop
13h 34mSTL-SEA
5/28mar.
1 stop
11h 06mSEA-STL
$139
5/13lun.
1 stop
13h 51mSTL-SEA
5/14mar.
1 stop
11h 06mSEA-STL
$147
10/2mié.
1 stopAmerican Airlines
10h 12mSTL-SEA
10/8mar.
1 stopAmerican Airlines
9h 32mSEA-STL
$195
9/16lun.
1 stopAmerican Airlines
8h 08mSTL-SEA
9/23lun.
1 stopAmerican Airlines
8h 05mSEA-STL
$213
6/3lun.
1 stopSpirit Airlines
18h 40mSTL-SEA
6/5mié.
3 stopsSpirit Airlines
30h 00mSEA-STL
$231
5/28mar.
2 stopsSpirit Airlines
24h 11mSTL-SEA
6/4mar.
1 stopSpirit Airlines
25h 30mSEA-STL
$236
9/4mié.
1 stopDelta
6h 58mSTL-SEA
9/6vie.
1 stopDelta
7h 20mSEA-STL
$248
5/14mar.
1 stopUnited Airlines
7h 55mSTL-SEA
5/21mar.
1 stopUnited Airlines
5h 41mSEA-STL
$262
6/6jue.
1 stopDelta
7h 09mSTL-SEA
6/13jue.
1 stopDelta
8h 25mSEA-STL
$266
9/4mié.
1 stopUnited Airlines
7h 52mSTL-SEA
9/7sáb.
2 stopsUnited Airlines
11h 47mSEA-STL
$354

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Recent one-way flight deals

5/17vie.
1 stopSpirit Airlines
18h 40mSTL-SEA
$85
5/17vie.
1 stopSpirit Airlines
18h 40mSTL-SEA
$90
5/21mar.
1 stopFrontier
10h 20mSTL-SEA
$91
5/22mié.
1 stopFrontier
28h 49mSTL-SEA
$95
6/6jue.
1 stopDelta
7h 09mSTL-SEA
$113
7/11jue.
1 stopDelta
7h 29mSTL-SEA
$154
7/13sáb.
1 stopAmerican Airlines
8h 02mSTL-GEG
$177
8/1jue.
1 stopAmerican Airlines
6h 52mSTL-GEG
$178
5/8mié.
2 stopsUnited Airlines
18h 11mSTL-SEA
$323
7/13sáb.
2 stopsUnited Airlines
31h 15mSTL-GEG
$328

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Last minute flights from St. Louis to Washington

Last minute flight, train and bus deals

5/3vie.
multi-stop
13h 03mSTL-SEA
5/7mar.
multi-stop
11h 27mSEA-STL
$201
5/3vie.
multi-stop
13h 03mSTL-SEA
5/7mar.
multi-stop
11h 27mSEA-STL
$216
5/1mié.
multi-stopAmerican Airlines
10h 59mSTL-SEA
5/11sáb.
multi-stopAmerican Airlines
9h 48mSEA-STL
$263
5/1mié.
multi-stopAmerican Airlines
10h 59mSTL-SEA
5/10vie.
multi-stopAmerican Airlines
7h 13mSEA-STL
$264
5/1mié.
multi-stopDelta
7h 08mSTL-SEA
5/4sáb.
multi-stopDelta
7h 02mSEA-STL
$266
5/3vie.
multi-stopDelta
7h 44mSTL-SEA
5/4sáb.
multi-stopDelta
8h 24mSEA-STL
$276
5/1mié.
multi-stopUnited Airlines
6h 27mSTL-SEA
5/11sáb.
multi-stopUnited Airlines
11h 54mSEA-STL
$361
5/1mié.
multi-stopUnited Airlines
11h 23mSTL-SEA
5/11sáb.
multi-stopUnited Airlines
11h 54mSEA-STL
$366
5/1mié.
multi-stopSpirit Airlines
23h 12mSTL-SEA
5/8mié.
multi-stopSpirit Airlines
31h 05mSEA-STL
$462
5/1mié.
multi-stopSpirit Airlines
23h 12mSTL-SEA
5/6lun.
multi-stopSpirit Airlines
22h 06mSEA-STL
$583

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St. Louis - Washington Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Washington - St. Louis

Cabin classes:

$1,217
$1,106
$1,146
$277