Plan to arrive at SEA at least two hours before your flight. Use SEA Spot Saver for a quicker security experience.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $234 (CheapOair) |
One-way from | $139 (Kiwi.com) |
Popular in | December |
Cheapest in | September |
Average price | $462 |
Good round-trip deal | $304 or less |
Good one-way deal | $243 or less |
Fly from
Fly to
Route
Depart
Return
Price
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
dom. 12/14
7:25 am-3:27 pm
Nonstop5h 02m
Washington, D.C. Reagan-National
lun. 12/15
4:55 pm-7:48 pm
Nonstop5h 53m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
dom. 1/11
1:55 pm-9:59 pm
Nonstop5h 04m
Washington, D.C. Reagan-National
lun. 1/19
8:00 am-10:55 am
Nonstop5h 55m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
dom. 1/11
7:15 am-9:00 pm
1 stop10h 45m
Washington, D.C. Reagan-National
mié. 1/21
5:01 pm-8:07 pm
Nonstop6h 06m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
dom. 1/11
7:15 am-9:00 pm
1 stop10h 45m
Washington, D.C. Reagan-National
vie. 1/16
5:01 pm-8:07 pm
Nonstop6h 06m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
vie. 12/12
7:25 am-3:27 pm
Nonstop5h 02m
Washington, D.C. Reagan-National
mié. 12/17
6:21 pm-11:58 pm
1 stop8h 37m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
mar. 2/3
9:55 am-10:55 pm
2 stops10h 00m
Washington, D.C. Reagan-National
mar. 2/10
3:25 pm-10:30 pm
2 stops10h 05m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
sáb. 1/10
7:20 am-3:20 pm
Nonstop5h 00m
Washington, D.C. Reagan-National
mié. 1/21
4:55 pm-7:54 pm
Nonstop5h 59m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
jue. 12/4
7:25 am-3:27 pm
Nonstop5h 02m
Washington, D.C. Reagan-National
dom. 12/7
6:02 am-10:40 am
1 stop7h 38m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
mié. 12/24
10:57 pm-11:37 am
1 stop9h 40m
Washington, D.C. Reagan-National
mar. 1/6
4:55 pm-7:54 pm
Nonstop5h 59m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
lun. 12/8
6:05 am-8:00 pm
1 stop10h 55m
Washington, D.C. Reagan-National
lun. 12/15
5:00 pm-8:13 pm
Nonstop6h 13m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars |
The price you pay for your flight from Seattle to Washington, D.C. Reagan-National Airport may vary depending on when you book. For the best chance of a lower fare, look to book 37 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Currently, July is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of $149). Flying from Seattle to Washington, D.C. Reagan-National Airport in January is currently the most expensive (average of $318). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Unlike at noon, when flights are generally more expensive, you can save up to 29% on flights from Seattle to Washington, D.C. Reagan-National Airport by exploring options for tickets in the afternoon.
Travelers seeking maximum savings on their Seattle to Washington, D.C. Reagan-National Airport flight should consider departing on Thursday afternoons when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Boarding
Comfort
Food
Overall
Entertainment
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Comfort
Food
Overall
Entertainment
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Comfort
Food
Overall
Entertainment
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Comfort
Food
Overall
Entertainment
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Comfort
Food
Overall
Entertainment
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Comfort
Food
Overall
Entertainment
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$128 | Average$291 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$143 | Average$458 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$236 | Average$432 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$269 | Average$441 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$276 | Average$456 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$296 | Average$496 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$302 | Average$525 | FlexibilityNo cancel fee | On-time75% |