$140 Find Cheap Flights from Seattle to District of Columbia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to District of Columbia departing on 1/6. 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
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to District of Columbia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to District of Columbia.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to District of Columbia.
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Flight Deals

Book Cheap Seattle to District of Columbia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to District of Columbia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to District of Columbia

Mon, Jan 5 - Sun, Jan 11
Alaska Airlines Logo
6:28 am - 9:19 pmSEA-DCA
11h 51m1 stop
Alaska Airlines Logo
8:59 am - 5:29 pmDCA-SEA
11h 30m1 stop
$247Alaska Airlines
Find Deal
Thu, Nov 27 - Thu, Dec 4
Hawaiian Airlines Logo
9:35 am - 5:34 pmSEA-IAD
4h 59mnonstop
Hawaiian Airlines Logo
7:34 am - 10:35 amIAD-SEA
6h 01mnonstop
$248Hawaiian Airlines
Find Deal
Thu, Jan 15 - Sat, Jan 24
United Airlines Logo
8:10 am - 4:16 pmSEA-IAD
5h 06mnonstop
United Airlines Logo
8:15 am - 1:58 pmIAD-SEA
8h 43m1 stop
$249United Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 4
Frontier Logo
12:58 pm - 2:02 pmSEA-DCA
22h 04m1 stop
Frontier Logo
8:00 am - 12:07 pmDCA-SEA
31h 07m1 stop
$252Frontier
Find Deal
Fri, Jan 16 - Sun, Jan 18
United Airlines Logo
12:35 pm - 12:59 amSEA-IAD
9h 24m1 stop
United Airlines Logo
5:17 pm - 10:43 pmIAD-SEA
8h 26m1 stop
$254United Airlines
Find Deal
Wed, Dec 3 - Sat, Dec 6
American Airlines Logo
1:28 pm - 11:56 pmSEA-DCA
7h 28m1 stop
American Airlines Logo
4:44 pm - 9:59 pmDCA-SEA
8h 15m1 stop
$259American Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
American Airlines Logo
1:47 pm - 12:01 amSEA-IAD
7h 14m1 stop
American Airlines Logo
6:00 am - 1:01 pmIAD-SEA
10h 01m1 stop
$259American Airlines
Find Deal
Sat, Nov 8 - Tue, Nov 11
Frontier Logo
12:58 pm - 1:02 pmSEA-DCA
21h 04m1 stop
Frontier Logo
6:00 pm - 12:07 pmDCA-SEA
21h 07m1 stop
$260Frontier
Find Deal
Wed, Dec 17 - Fri, Jan 16
Delta Logo
3:30 pm - 11:27 pmSEA-IAD
4h 57mnonstop
Delta Logo
7:30 am - 10:29 amIAD-SEA
5h 59mnonstop
$268Delta
Find Deal
Tue, Mar 10 - Sat, Mar 14
Delta Logo
3:55 pm - 11:56 pmSEA-IAD
5h 01mnonstop
Delta Logo
7:00 am - 10:04 amIAD-SEA
6h 04mnonstop
$282Delta
Find Deal
Booking Insights

KAYAK's insights & trends for Seattle to District of Columbia flights

Get data-powered insights and trends into flights from Seattle to District of Columbia to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Seattle to District of Columbia flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to District of Columbia from Seattle found in the last 72 hours was to Washington, D.C., at $217 round-trip. The most popular route is from Seattle (SEA) to Washington, D.C. Dulles Intl Airport (IAD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $217.

Can I save money by flying with a layover from Seattle to District of Columbia?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $391 on average.

What is the cheapest month to fly from Seattle to District of Columbia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to District of Columbia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to District of Columbia is August, when tickets cost $347 (return) on average. On the other hand, the most expensive months are December and June, when the average cost of round-trip tickets is $497 and $450 respectively.

What’s the cheapest day of the week to fly from Seattle to District of Columbia?

The average price of all round-trip flights from Seattle to District of Columbia clicked on KAYAK for each day over the last 12 months.

When flying from Seattle to District of Columbia, you should consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

How far in advance should I book a flight from Seattle to District of Columbia?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to District of Columbia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to District of Columbia, you should book around 4 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonSeptember
Cheapest flight$140
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Seattle to Reagan Washington National Airport

Flights from Seattle to District of Columbia: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Seattle to District of Columbia 
SuzetteFlew with Alaska AirlinesSEA-IADMay 2025
Take a shower before arriving at airport and don't wear perfume at all! Pack bags tight, so boarding is smooth and quick.
DanielFlew with Alaska AirlinesSEA-IADMay 2025
Seatac has gnarly traffic right now, took 35min to get from highway exit to the terminal

FAQs - booking District of Columbia flights

  • How does KAYAK find such low prices on flights from Seattle to District of Columbia?

    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 Seattle to District of Columbia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to District of Columbia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to District of Columbia 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 Seattle to District of Columbia?

    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 from Seattle to District of Columbia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to District of Columbia?

    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 from Seattle to District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to District of Columbia?

    The cheapest time of day to fly to District of Columbia is generally in the evening, when round-trip flights cost $357 on average. Morning departures are around 42% more expensive than evening flights, on average. The most expensive time of day to fly to District of Columbia is generally in the morning, which is peak travel time and where the average cost of a ticket is $506.

Reviews of the top 5 airlines serving from Seattle to District of Columbia

 
See real verified KAYAK customer reviews for airlines flying from Seattle to District of Columbia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to District of Columbia? 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
Alaska AirlinesOverall score based on 11199 reviews
8.1Boarding
7.0Entertainment
8.5Crew
7.8Comfort
7.1Food
Airline reviews

Its bumpy but I can say its safe flight ,Thanks Alaska airline for bringing me in my destination😊.

8.0 ExcellentMary Grace, Oct 2025SEA - BNA
Read more Alaska Airlines reviews

Its bumpy but I can say its safe flight ,Thanks Alaska airline for bringing me in my destination😊.

Almost 3 hr delay in Settle with very little information available to passengers. They boarded the plane and we waited for a long time inside the plane as well.

This was our first time flying with Alaska. It was a seamless experience, with comfortable seats and leg room. Staff were friendly and helpful.

Flight on time. Crew good. Seating Bad. Have to pay extra on a not cheap flight to avoid being next to toilet.

The crew was great! Passengers were nice. Just an fyi that I heard several of them complain that the snack was not gluten free. Many people got handed the snack and then promptly gave it back to the flight attendant. Might be good to look into another option as such a high percentage of people in CO and WA are gf. Cheers!

Food and entertainment not applicable - standard drinks and cinnamon cookies; crew did not do a song and dance for us so no entertainment. I like the slightly better leg room than American Airlines - at least it felt that way. Flight crew and atmosphere seemed more welcoming than American, too.

It was fine, mostly I was just happy to be on my last leg home. No in flight entertainment but that's forgivable since it was only a 2 hour flight.

Was delayed in Newark 24 hours due to mechanical problems. The staff was very helpful in trying to make the best of a trying situation. In SeaTac, they changed gates and times. Usually have no problems from SeaTac.

Flight was cancelled, then rebooked on a flight that I was unable to get through since they had closed the gate.

Terrible. We were bumped off our flight to another and weren't sent notice until we were on our prior flight. We got home four hours later and the airline couldn't have cared less.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

I like Hawaiian, it was great that they had good internet connection across the Pacific Ocean, thanks to Star Link satellites. The seating was comfortable, ( I was in economy ). Maybe I missed it, but I only got offered a beverage once. It was a nonstop flight KOA to SMF. I would take it again next time I go that way.

I always love flying Hawaii and I have nothing to add

Previously flown Hawaiian Airlines on similar routes, I found Alaska Airlines to be noticeably more comfortable. The seats on Alaska Airlines provided better support and cushioning, which made a significant difference on the long flight to the islands. When you’re spending 5-6 hours in the air, seat comfort really matters, and Alaska Airlines delivered where it counts. After comparing both carriers, I’ve decided to book with Alaska Airlines for all my future Hawaii trips. The superior seat comfort alone makes it worth choosing Alaska over Hawaiian Airlines. If you’re planning a trip to Hawaii and prioritizing comfort, I’d recommend giving Alaska Airlines a try. You won’t be disappointed. Highly recommended for Hawaii travel!

I received several emails about my 3:10 flight. When I showed up to the airport at 12:30 to check my bags I was told the flight was actually at 1 pm. They grudgingly rebooked me for a flight at 5:22 to Vegas to get a connecting to LAX. I did find the gate for my original 3:10 flight but they were booked. I proceeded to receive status updates and gate change information for the 3:10 flight, even though I was apparently never supposed to be on that flight

My flight was delayed three hours and then cancelled. The gate agent proceeded to rebook me in a middle seat without telling me and I was placed between two large individuals who did not fit in their own seats and instead took up most of mine. It was an awful experience.

The food options were limited and very specific. Some type of entertainment option for a 4.5 hour flight would have been nice.

Flight was smooth and comfortable. We were able to check a bag at counter due to full flight and boarded with an earlier group. We were there very early and didn’t hear the gate change just noticed our flight was no longer displayed st the gate. There were two other flights with gate shuffles - may be unavoidable but not desirable. First time I had to print my own luggage tag and attach at arrival. Not a fan of that process.

The crew was EXTREMELY helpful And sweet and the flight was smooth!

I received an email from Kayak with confirmation number for Hawaiian and another for Alaska. I received emails from Kayak for both my outbound and return flight to say "time to check in." Despite trying each number (Hawaiian and Alaska), I could not check in for outbound or return. It was then confusing at the airport - I hda "no place to go" to figure out how to check in. All the kiosks are marked "scan bag,etc." I wandered around with no agent to talk to. That was a bit stressful. Either Kayak, or airline, needed better communication on what to expect and to do.

Everything was great and smooth. Given the short flight there was no entertainment but the rating does not give this option. My first flight with Hawaiian was a success all around.

Crew was dismissive. Snacks and refills not offered. Poor business class experience. Bed not comfortable compared to Emirates or BA.

Flight was delayed for 5 hours because crew didn’t have enough time to rest - this seems like it could have been avoided with better scheduling. Food was not good.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

This is the best united airlines flight that I took. The crew was very friendly and the food was tasty!

It is clear that someone knew, and competent, is in charge of food at United Airlines at least for the international flights. I was flying in coach, but the choices of the dinner were excellent. Tasty, and appropriate size. I had the beef, which was a little bit like a shepherds pie, and it was good. Nothing comparable has been served on a United flight in years. It will not be confused with three star food, but it is very good for airline food. Even better was the breakfast choice between a cinnamon roll and a breakfast sandwich. I chose the breakfast sandwich which was absolutely delicious and which I would happily order again at my local Starbucks or Panera. It is clear that someone knew indifferent is in charge of the food and it’s about time.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Had one staff that was not pleasant. Seems they are stressed with too many people to care for.

I would have liked an opportunity to move to a different seat ( even would have checked in my hand luggage)as I had health issues where I didn't have to clamber over the passenger next to me to for toilet use/ movement [ She was a highly unpleasant neighbor to sit next to]. In addition, I found that my European phone plan had run out of data and so I was not receiving emails from yourselves on airport wifi to be able to check in online and verifications difficult as did not accept the ticket number I had. I asked for an extra blanket but was told there was none. Then I saw other passengers receiving them. I couldn't eat the food and asked for snacks : Stewardess said " on the way" but they did not bring. The best bit was the check in process in Lisbon. Very efficient. However, I did not understand why we had to collect our bags at Washington then go through customs again. It was not explained. I also with my leg and health issue had approximately mile walk to the gate ( which then changed) . There appeared to be no moving walkways or help provided.

The attendant were friendly. I suggest you have a medical attendant on board every flight so that in case someone is sick , he/she will help them.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Too many extra fees, uncomfortable, little leg room. Will not recommend this airline.

Everyone seemed to be in zone 1 for boarding. Maybe break it up a little. Otherwise, smooth flight.

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