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Find cheap flights from St. Louis to Washington from $68

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 5/15. 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
Fri 6/7
Fri 6/14

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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$144
Spokane
Spokane1 stop$302
Pasco
Pasco2 stops$442
Pullman
Pullman1 stop$649
Yakima
Yakima1 stop$705
Portland
Portland1 stop$157

Good to know

Low season

January

High season

July

Cheapest flight

$68
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 19% 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 $236 one-way - $443 round-trip
  • Morning departure is around 38% 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 10789 reviews
8.6Crew
7.9Comfort
7.4Food
8.2Boarding
8.0Entertainment
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.

Surprisingly easy! I was hesitant to try this, but the cost swayed me. I actually felt like I had less stress than all the taxiing and possible delays that occur with short regional flights where you spend less time in the air than getting to and from the plane..

This flight was delayed multiple times and eventually canceled around 2-3ish. Original take off time was around 10:30am. By 3, there were no other options out of Houston, so stuck in Houston for from 3pm - 11am the next day.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

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

Even though we left CMI late, we mostly made up the time.

Delayed almost 4 hours for a 45 minute flight with no explanation.

Again, multiple delays and I eventually just canceled and drove!

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Horrible - they lied to me about baggage & boarding, even though I specifically spoke to their agents the day before my flight about my issue. When I showed up they did not let me board and stranded me at my airport until I bought a new flight with money I did not have to spend.

All four American Airlines flights I took in last seven days were delayed. Caused me loads of problems, missed meetings, loss of time and money.

American cancelled our flight home. Zero option for hotel, alternative transportation and took 3 hours to find our bags so we could take a 3 hour UBER ride home on our dime. Never flying AA again.

They gave my seat away although it was a connecting flight with them and the flight was a bit delayed.

Flight was cancelled had to move to another gate late again no internet paid for the month and never can use it waste of money

For it to have left on time! Instead of two hours early with zero notice

Flight kept delayed from morning to late afternoon so I had to make other arrangements

Crew was nice, explained emergency protocol very well. Flight took off and arrived on time. Pilot explained the small delay that occurred with docking and providing updates. I would definitely fly spirit again.

Terrible… missed our flight due to ridiculously long time to go thru baggage check-in!

The crew was not great or professional. It seemed like they didn't really want to be there. A true lack of effort for accommodating customers.

Everything was really good but the seats are not very comfortable.

I paid for WiFi, but it (WiFi) was very very slow, will never take again! Impossible open Utube 😤😤😤

I had no legroom, although I paid for extra legroom. I could barely put my bag in front of my feet and under the seat. The Wi-Fi was horrible. In fact the flight attendant said that they had to reboot it and see if it was going to work and never did.

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.

Book cheap flights from St. Louis to Washington

Recent round-trip flight deals

5/25Sat
1 stop
13h 00mSTL-SEA
5/28Tue
1 stop
11h 06mSEA-STL
$144
5/30Thu
1 stop
26h 41mSTL-SEA
6/4Tue
1 stop
13h 25mSEA-STL
$148
6/12Wed
1 stopSpirit Airlines
8h 14mSTL-SEA
6/18Tue
1 stopSpirit Airlines
13h 24mSEA-STL
$163
9/5Thu
1 stopFrontier
17h 19mSTL-SEA
9/16Mon
1 stopFrontier
11h 42mSEA-STL
$169
7/10Wed
1 stopSpirit Airlines
10h 47mSTL-SEA
7/17Wed
1 stopSpirit Airlines
6h 57mSEA-STL
$170
9/25Wed
1 stopAmerican Airlines
9h 54mSTL-SEA
10/7Mon
1 stopAmerican Airlines
8h 05mSEA-STL
$210
8/12Mon
1 stopAmerican Airlines
9h 17mSTL-SEA
8/19Mon
1 stopAmerican Airlines
6h 46mSEA-STL
$213
9/11Wed
1 stopDelta
6h 18mSTL-SEA
9/20Fri
1 stopDelta
7h 20mSEA-STL
$226
9/6Fri
1 stopDelta
6h 58mSTL-SEA
9/13Fri
1 stopDelta
7h 20mSEA-STL
$231
7/12Fri
3 stopsUnited Airlines
20h 57mSTL-PSC
7/15Mon
2 stopsUnited Airlines
24h 58mPSC-STL
$869

Search by stops

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Recent one-way flight deals

5/15Wed
1 stopSpirit Airlines
23h 09mSTL-SEA
$68
6/5Wed
1 stopSpirit Airlines
8h 14mSTL-SEA
$85
5/15Wed
1 stopFrontier
14h 26mSTL-SEA
$88
9/3Tue
1 stopFrontier
12h 05mSTL-SEA
$91
6/17Mon
1 stopDelta
6h 23mSTL-SEA
$118
6/6Thu
1 stopDelta
7h 09mSTL-SEA
$129
8/10Sat
1 stopAmerican Airlines
6h 17mSTL-GEG
$153
9/21Sat
2 stopsUnited Airlines
16h 13mSTL-SEA
$243
5/21Tue
nonstopAmerican Airlines
4h 19mSTL-SEA
$249
5/29Wed
2 stopsUnited Airlines
17h 41mSTL-SEA
$278

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Last minute flights from St. Louis to Washington

Last minute flight, train and bus deals

5/13Mon
multi-stopFrontier
13h 51mSTL-SEA
5/20Mon
multi-stopFrontier
12h 13mSEA-STL
$244
5/12Sun
multi-stopFrontier
17h 51mSTL-SEA
5/18Sat
multi-stopFrontier
11h 49mSEA-STL
$279
5/10Fri
multi-stopDelta
7h 09mSTL-SEA
5/13Mon
multi-stopDelta
8h 30mSEA-STL
$286
5/11Sat
multi-stopSpirit Airlines
23h 06mSTL-SEA
5/14Tue
multi-stopSpirit Airlines
11h 06mSEA-STL
$381
5/10Fri
multi-stopUnited Airlines
7h 55mSTL-SEA
5/14Tue
multi-stopUnited Airlines
11h 44mSEA-STL
$392
5/13Mon
multi-stopSpirit Airlines
18h 40mSTL-SEA
5/20Mon
multi-stopSpirit Airlines
26h 02mSEA-STL
$448
5/12Sun
multi-stopDelta
6h 25mSTL-SEA
5/17Fri
multi-stopDelta
8h 30mSEA-STL
$457
5/11Sat
multi-stopAmerican Airlines
6h 48mSTL-SEA
5/14Tue
nonstopAmerican Airlines
3h 59mSEA-STL
$487
5/10Fri
nonstopAmerican Airlines
4h 25mSTL-SEA
5/14Tue
multi-stopAmerican Airlines
7h 11mSEA-STL
$647
5/12Sun
multi-stopUnited Airlines
8h 38mSTL-SEA
5/18Sat
multi-stopUnited Airlines
11h 54mSEA-STL
$673

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St. Louis - Washington Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Washington - St. Louis

Cabin classes:

$936
$1,106
$1,146
$276