Book Cheap United flight from Seattle (SEA) to Washington (DCA) from CA $248

Find The Best Day to Book a Cheap United Flights From Seattle to Washington

Cheapest United Flights from Seattle (SEA) to Washington (DCA)

The cheapest flights to Ronald Reagan Washington National found within the past 7 days were CA $465 round trip and CA $248 one way. Prices and availability subject to change. Additional terms may apply.

Sun, Jan 18 - Sat, Jan 31
SEA
Seattle
DCA
Washington
CA $465 Roundtrip, found 17 hours ago
CA $465
Roundtrip
found 17 hours ago
Select United flight, departing Sun, Jan 18 from Seattle to Washington, returning Sat, Jan 31, priced at CA $465 found 17 hours ago

Frequently asked questions

Can I catch a flight from Seattle - Tacoma Intl. Airport (SEA) to National Airport right now?
For information on any present Ronald Reagan Washington National Airport (DCA) quarantine requirements and travel advice, go to the Covid-19 Travel Advisor. Check before you arrange your flight, so you don't get caught up en route.
What terminal is United Airlines at Sea-Tac Airport?
Before you travel from Sea-Tac Airport to DCA with United Airlines, it's probably a good idea to contact the airline for your terminal information. While your boarding pass should contain some of the relevant details, we can't guarantee it.
Are there United Airlines non-stop flights from SEA to DCA?
United Airlines doesn't provide direct flights between SEA and Ronald Reagan Washington National Airport (DCA), so get ready to make a stopover. If you have enough time between flights, hit the airport shops while you wait for your connection.
How long is a United Airlines flight from SEA to DCA?
Indulge in some in-flight shut-eye and touch down at your destination relaxed and refreshed. You'll have sufficient time to do so when traveling with United Airlines between SEA and DCA, with the average flight lasting 6 hours and 46 minutes.
How many direct and indirect flights does United Airlines fly from SEA to DCA?
You can select from approximately 3 United Airlines flights daily from SEA to DCA.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Ronald Reagan Washington National Airport (DCA), please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Grab a great United flight from SEA to DCA 

To find a great deal on United flights with Travelocity, simply enter your origin and destination airports, pick your travel dates, and hit search. From here, you can sort by price, flight duration, and arrival/departure time. You can also filter to find nonstop flights. 

Flying United Seattle to Washington gives you fights to choose from. With that direct flight time of , you’ll be touching down before you know it.  

 

Find cheap flights with United between Seattle and Washington 

United has a range of great fares on stacks of flights, and to find the most affordable for you, there are a few tricks you can try. Booking in advance, for example, is a great way to grab a fantastic deal. Also, choose the cheapest month, if you can. One-way flights from Seattle to Washington with United are January.  

The more flexible you are, the more affordable flights you’re likely to find. Consider one-way flights and connecting flights, as well as standard roundtrip and direct options. Even if you’re flying today, cheap last-minute flights are easy to find by entering your travel dates and hitting search.  

 

Reasons to book your United flights with Travelocity 

Travelocity makes it easy to book a seat, anywhere in the world. The vast inventory, fast search, and advanced filters put some of the best deals on the planet in one place. Whether you’re traveling on business, with friends, family, or on your own, take your pick from some fantastic options. And with free cancellation and pay later options, you can travel more and worry less.  

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

Travelers ❤️ these 🏨 after their flight to Washington

AC Hotel by Marriott Arlington National Landing

AC Hotel by Marriott Arlington National Landing

4 out of 5
1999 Richmond Highway Arlington VA
Book a stay at this business-friendly hotel in Arlington. Enjoy breakfast (surcharge), 24-hour room service, and a fitness center. Our guests praise the helpful ...
9.2/10 Wonderful! (230 reviews)
The front desk clerk was professional and friendly. Great bar staff and food!

Reviewed on Dec 20, 2025

AC Hotel by Marriott Arlington National Landing
Hilton Garden Inn Reagan National Airport

Hilton Garden Inn Reagan National Airport

3.5 out of 5
2020 Richmond Highway Arlington VA
Book a stay at this business-friendly hotel in Arlington. Enjoy free WiFi, breakfast (surcharge), and a free airport shuttle. Our guests praise the helpful staff ...
8.4/10 Very Good! (1,745 reviews)
The staff was friendly, and courteous.

Reviewed on Dec 21, 2025

Hilton Garden Inn Reagan National Airport
Hyatt Regency Crystal City

Hyatt Regency Crystal City

4 out of 5
2799 Richmond Hwy Arlington VA
Book a stay at this business-friendly hotel in Arlington. Enjoy free WiFi, an outdoor pool, and breakfast (surcharge). Our guests praise the helpful staff in ...
9/10 Wonderful! (1,001 reviews)
Clean rooms, nice venue

Reviewed on Dec 16, 2025

Hyatt Regency Crystal City
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.