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Find cheap flights from St. Louis to Washington from $71

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 6/21. 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
Thu 7/11
Thu 7/18

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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$173
Spokane
Spokane1 stop$287
Pasco
Pasco2 stops$423
Yakima
Yakima1 stop$739
Portland
Portland1 stop$148

Good to know

Low season

January

High season

July

Cheapest flight

$71
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 24% increase in price.
Flight from St. Louis to Portland

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 $193 one-way - $391 round-trip
  • Morning departure is around 23% 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 10277 reviews
8.0Entertainment
7.4Food
8.6Crew
8.2Boarding
7.9Comfort
Airline reviews

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

10.0 ExcellentDonald, May 2024FLL - SEA
Read more about Delta reviews

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

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!

It is a modern tragedy that any airline expects you to travel for 14 hours in such discomfort and that the only way to add comfort is exorbitant prices. I was in pain by the time we landed. Shameful.

Original plane sidelined. Had to wait an hour for replacement.

Crew was very cooperative and professional. Passenger's first checked in bag should be free.

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

Horrible, the flights kept delaying, so it is obvious that we won't be able to make it to the next connection. No easier/real agent on site to help you figure this out. UA agent on other counters refuse to assist you and direct us to use the QR code/call customer service. So inefficient and poor. While technology seems convenient, but it's not the best interest/experience for customers need help while there is active issue need assistance.

After the morning frenzy of 35 min wait through CLT security at 4;30 AM, it was nice to have a smooth pleasant boarding experience. This 6:30 AM flight was not full. We were able to get seated swiftly and took off promptly. Nice touch they distributed the old fashioned headsets with 8 mm jacks. Snacks were decent and arrival was uneventful.

My window shade didn’t work. So I missed coming into my city. ☹️

Flight was delayed in the gate by 5 hours and ultimately cancelled- rebooking service by United agents was terrible

Flight was delayed due to the late arrival of the catering truck, which is quite unacceptable. There was a beverage service, but no pretzel, or cookie, or nuts were served in coach.

Not worth the price of premium class ticket paid, felt more like steerage.

Paid for premium economy had no tv the whole time the crew tried to reset/reboot but would not work they said they would put a trouble ticket in for it. We had 3 seats my tv was the only one that didn't work. They cancelled our flight re worked us on another that left us at airport over night on the floor I have a ten year old and a 78 diabetic mother which also had shingles and suffers from nerve pain in legs and back. Requested wheelchair service at all airports after the re route NO wheelchair service was there to help. WORST experience we have ever had. Went to American airlines assistance it was closed. I AM FURIOUS!!! I expect some sort of compensation from this traumatic experience and no need for flying points we don't plan on using American airlines again!!!!

This is by far the worst experience I have had with American Airlines. The start of this trip was a complete disaster. I purposely planned my trip so that I would weather any delays so that I could make very important meeting at the Pentagon. My flight was cancelled because of maintenance and I was put on the first flight the next day but I was late to the meeting. After a long week at the Pentagon I just wanted to go home and my flight home which was early in the day was delayed. Eventually the flight was delayed until the next day. I was not authorized a hotel room because DCA was my point of origin. So I paid for a hotel out of pocket. The flight this morning was boarded then deplaned because the aircraft was hot. The flow of information was not happening in DCA and made it worse when the news was bad. I am going to take a break from American for my next few military flights. Hopefully whatever has been going on with American Airlines will be resolved.

We had a 2 hour delay. The seats were smaller than most other airlines. The person in front of us wanted to lay back and we had to stop her because she was pressing against my girlfriend’s legs. We had to ask her to sit up and not lay back due to the lack of room.

Everything was fine once we actually got on our flight. It was more then annoying they canceled (delayed) our flight. We lost out on a day of our trip along with money on our stay. Plus we had to book another hotel. So expensive.

This flight was canceled and delayed several times without explanation. The plane was freezing cold and no wifi for messaging. Getting off the plane was terribly unorganized and felt like it took forever….

The flight was delayed several times without explanation. The seats were terribly uncomfortable and wifi isn’t included. All these make for a less than ideal flight.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

Internet service was erratic. Crew service was poor and slow. My luggage on this non-stop flight was lost and not recovered

Terrible. I didn’t fly and I had an important meeting the next day.

Equipment swap led to 2+ hour delay on international flight. And to top it off, boarding took forever.

Flight was canceled less than 6 hours before takeoff, rebooked on a flight that was twice as long and left earlier so we couldn’t make it, when using text support option took over 2 hours to speak with someone.

Not enough help at airport during boarding process. Flight was delayed. Overall WORST flying experience I’ve ever had. Will NEVER FLT SPIRIT AGAIN

Terrible legroom, seats do not recline, tray table the size of an iPhone, delayed flight, have to pay 5$ to get a cup of water onboard.

Could have TV/Movie and some water ou soda free

Flight was good and clean but delayed over an hour on the return flight.

The non stop flight and able to go into Atlantic City airport. They could lower the prices. It starts out low but then if you want to bring luggage and pick your seat the price goes up quite a bit.

Flight got diwngraded last minute and left us stranded. I was told I’ll be given credit for my luggage and seat upgrades but haven’t got anything yet

We can’t predict circumstances like this ahead of time, but I give your staff a hats off for immediately giving us updated informations.

It was nice! There was a very unhappy child in front of us and the flight attendant did a great job calming the child. I was impressed.

The plane was not on time for boarding or departure or arrivals.

I strongly dislike Frontier. I find them barebones, the seats not particularly comfortable, the nickel and diming is maddening, the app is TERRIBLE - super confusing to navigate, and the last 4 frontier flights I have flown have been on AVERAGE 2 hours late, one ruining a fancy night out in Vegas with reservations made well in advance, which was nodded to with a measly 5000 miles, which translates to almost nothing. At least credit a free checked bag or something.

8 hr delay. had to buy another ticket with another airline

Four and a half hour delay in total. What frustrates me most is the poor communication and disorganization.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

FRONTIER SUCKS! The agent downstairs tricked me into booking, just to get to the gate. At the gate, they told me they couldn't help. I then called Customer Service. They and the gate attendants kept blaming each other. Neither side was willing to help the customer.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Didn't like anything..entire crew was very rude to everyone on the flight. Plane old and the trays fall down on you the while time you're flying. Charged more for a carry on bag than for the plane ticket itself. Did make it from point a to point b, but worth the extra money to fly with another airline

9 hours of delay!! Was not able to check my luggage that I paid for!!!

It was delayed 9 hours for operational reasons, despite the plane arriving to the airport on time.

Book cheap flights from St. Louis to Washington

Recent round-trip flight deals

6/22Sat
1 stopFrontier
14h 43mSTL-PDX
6/25Tue
1 stopFrontier
11h 37mPDX-STL
$148
8/7Wed
1 stopFrontier
13h 46mSTL-PDX
8/11Sun
1 stopFrontier
17h 48mPDX-STL
$170
8/20Tue
1 stopAmerican Airlines
8h 39mSTL-SEA
8/27Tue
1 stopAmerican Airlines
10h 35mSEA-STL
$196
8/27Tue
1 stopAmerican Airlines
7h 59mSTL-PDX
8/31Sat
1 stopAmerican Airlines
7h 04mPDX-STL
$202
8/31Sat
1 stopDelta
6h 33mSTL-SEA
9/6Fri
1 stopDelta
7h 58mSEA-STL
$216
7/9Tue
1 stopDelta
7h 31mSTL-SEA
7/16Tue
1 stopDelta
6h 10mSEA-STL
$226
8/14Wed
1 stopSpirit Airlines
22h 15mSTL-SEA
8/18Sun
1 stopSpirit Airlines
15h 35mSEA-STL
$262
7/13Sat
1 stopUnited Airlines
7h 50mSTL-SEA
7/16Tue
1 stopUnited Airlines
9h 28mSEA-STL
$265
7/9Tue
2 stopsSpirit Airlines
33h 33mSTL-PDX
7/16Tue
2 stopsSpirit Airlines
27h 27mPDX-STL
$275
7/1Mon
1 stopUnited Airlines
7h 50mSTL-SEA
10/31Thu
1 stopUnited Airlines
7h 12mSEA-STL
$282

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Recent one-way flight deals

6/21Fri
1 stopFrontier
16h 03mSTL-PDX
$71
6/25Tue
2 stopsFrontier
21h 51mSTL-PDX
$85
9/10Tue
1 stopSpirit Airlines
13h 18mSTL-PDX
$91
10/12Sat
1 stopAmerican Airlines
8h 37mSTL-SEA
$98
9/30Mon
1 stopDelta
7h 18mSTL-SEA
$108
9/10Tue
2 stopsSpirit Airlines
19h 20mSTL-PDX
$109
7/30Tue
1 stopDelta
7h 31mSTL-SEA
$113
7/13Sat
1 stopUnited Airlines
7h 50mSTL-SEA
$152
8/24Sat
2 stopsUnited Airlines
14h 52mSTL-SEA
$158
7/31Wed
nonstopAmerican Airlines
4h 28mSTL-SEA
$249

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Last minute flights from St. Louis to Washington

Last minute flight, train and bus deals

6/14Fri
multi-stopFrontier
10h 36mSTL-PDX
6/25Tue
multi-stopFrontier
11h 37mPDX-STL
$218
6/14Fri
multi-stopFrontier
10h 36mSTL-PDX
6/25Tue
multi-stopFrontier
15h 01mPDX-STL
$223
6/14Fri
multi-stopFrontier
8h 23mSTL-PDX
6/18Tue
multi-stopFrontier
11h 37mPDX-STL
$226
6/12Wed
multi-stopAmerican Airlines
7h 41mSTL-SEA
7/2Tue
multi-stopAmerican Airlines
10h 08mSEA-STL
$266
6/14Fri
multi-stopAmerican Airlines
9h 30mSTL-SEA
6/15Sat
multi-stopAmerican Airlines
6h 34mSEA-STL
$276
6/12Wed
multi-stopDelta
6h 34mSTL-PDX
6/13Thu
multi-stopDelta
8h 39mPDX-STL
$317
6/12Wed
multi-stopDelta
6h 34mSTL-PDX
6/12Wed
multi-stopDelta
8h 05mPDX-STL
$378
6/12Wed
multi-stopUnited Airlines
7h 51mSTL-PDX
6/13Thu
multi-stopUnited Airlines
5h 49mPDX-STL
$408
6/12Wed
multi-stopUnited Airlines
8h 05mSTL-SEA
6/18Tue
multi-stopUnited Airlines
9h 10mSEA-STL
$412
6/15Sat
multi-stopSpirit Airlines
34h 35mSTL-SEA
6/22Sat
multi-stopSpirit Airlines
25h 14mSEA-STL
$1,033

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St. Louis - Washington Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Washington - St. Louis

Cabin classes:

$1,066
$1,889
$2,199
$276