
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $235 (CheapOair) |
One-way from | $131 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $357 |
Good round-trip deal | $405 or less |
Good one-way deal | $218 or less |
Fly from
Fly to
Route
Depart
Return
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Σαβ 9/12
6:15 am-11:17 am
1 stop8h 02m
Seattle/Tacoma Intl
Δευ 9/21
10:47 pm-9:28 am
1 stop7h 41m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Κυρ 8/30
7:10 am-10:03 am
Nonstop5h 53m
Seattle/Tacoma Intl
Σαβ 9/5
3:55 pm-11:55 pm
Nonstop5h 00m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Τρι 7/7
7:49 pm-9:19 am
1 stop16h 30m
Seattle/Tacoma Intl
Τρι 7/14
9:04 pm-6:45 pm
1 stop18h 41m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Τετ 7/1
7:00 am-9:45 am
Nonstop5h 45m
Seattle/Tacoma Intl
Παρ 7/10
3:58 pm-11:59 pm
Nonstop5h 01m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Πεμ 5/14
5:55 pm-8:53 pm
Nonstop5h 58m
Seattle/Tacoma Intl
Κυρ 5/17
10:41 pm-6:50 am
Nonstop5h 09m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Πεμ 5/14
5:55 pm-8:53 pm
Nonstop5h 58m
Seattle/Tacoma Intl
Σαβ 5/23
8:00 am-4:09 pm
Nonstop5h 09m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Τρι 5/26
7:37 pm-9:30 pm
1 stop28h 53m
Seattle/Tacoma Intl
Κυρ 5/31
11:30 pm-7:34 am
Nonstop5h 04m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Πεμ 5/14
4:30 pm-12:55 am
1 stop11h 25m
Seattle/Tacoma Intl
Σαβ 5/23
9:00 am-10:55 pm
1 stop10h 55m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Πεμ 7/16
7:49 pm-9:19 am
1 stop16h 30m
Seattle/Tacoma Intl
Παρ 7/31
9:04 pm-6:57 pm
1 stop18h 53m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Κυρ 8/16
5:18 pm-8:03 pm
Nonstop5h 45m
Seattle/Tacoma Intl
Παρ 8/21
2:26 pm-12:40 am
1 stop7h 14m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
The price you pay for your flight from Washington, D.C. Dulles Intl Airport to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 36 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Seattle (average of $231). Flying from Washington, D.C. Dulles Intl Airport to Seattle in June is currently the most expensive (average of $474). 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.
One of the essential ways to save on airfare from Washington, D.C. Dulles Intl Airport to Seattle is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 8% on airfare.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Seattle flight should consider departing on Thursday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Las Vegas (LAS) – chosen by Cheapflights users on 67% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to Seattle on Cheapflights.
Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $218.
Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 9h 44m.
Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 2h 04m.
Entertainment
Boarding
Food
Overall
Comfort
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Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Food
Overall
Comfort
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Food
Overall
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Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Food
Overall
Comfort
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Food
Overall
Comfort
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Food
Overall
Comfort
Crew
Reviews
Eugene,Mar 2026
MFR - SEA
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$111 | Average$243 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$143 | Average$353 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$148 | Average$357 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$199 | Average$417 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$227 | Average$427 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$336 | Average$527 | FlexibilityNo cancel fee | On-time71% |