Check-in at IAD can be crowded in the afternoon and evening. Arrive early to navigate the busy main terminal efficiently.
Most accurate provider | Mytrip 3 stars |
---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $242 (Kiwi.com) |
One-way from | $127 (CheapOair) |
Popular in | December |
Cheapest in | September |
Average price | $392 |
Good round-trip deal | $303 or less |
Good one-way deal | $165 or less |
Fly from
Fly to
Route
Depart
Return
Price
BaltimoreSeattle
BWI - SEA
BWISEA
Baltimore/Washington
Wed 5/14
6:00 am-10:28 am
1 stop7h 28m
Seattle/Tacoma Intl
Sun 8/24
7:33 pm-6:06 am
1 stop7h 33m
BaltimoreSeattle
BWI - SEA
BWISEA
Baltimore/Washington
Fri 5/2
6:12 pm-12:44 am
1 stop9h 32m
Seattle/Tacoma Intl
Sat 5/10
3:20 pm-6:10 am
1 stop11h 50m
BaltimoreSeattle
BWI - SEA
BWISEA
Baltimore/Washington
Fri 5/23
5:23 pm-2:10 pm
1 stop23h 47m
Seattle/Tacoma Intl
Fri 5/30
7:10 pm-4:53 pm
1 stop18h 43m
BaltimoreSeattle
BWI - SEA
BWISEA
Baltimore/Washington
Wed 6/18
6:15 am-3:03 pm
1 stop11h 48m
Seattle/Tacoma Intl
Wed 7/2
3:58 pm-5:43 am
1 stop10h 45m
BaltimoreSeattle
BWI - SEA
BWISEA
Baltimore/Washington
Tue 6/3
7:26 am-12:47 pm
1 stop8h 21m
Seattle/Tacoma Intl
Mon 6/9
12:05 am-11:16 am
1 stop8h 11m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Wed 5/14
6:30 am-9:13 am
Nonstop5h 43m
Seattle/Tacoma Intl
Wed 5/28
7:00 am-6:25 pm
1 stop8h 25m
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Sat 5/31
9:59 am-6:51 pm
1 stop11h 52m
Seattle/Tacoma Intl
Sat 6/7
1:48 pm-9:59 pm
Nonstop5h 11m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Wed 5/28
7:15 am-1:44 pm
1 stop9h 29m
Seattle/Tacoma Intl
Sun 6/1
3:11 pm-5:58 am
1 stop11h 47m
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Fri 5/16
7:45 am-6:02 pm
1 stop13h 17m
Seattle/Tacoma Intl
Fri 5/23
3:11 pm-5:55 am
1 stop11h 44m
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Wed 5/14
4:59 pm-7:50 pm
Nonstop5h 51m
Seattle/Tacoma Intl
Thu 5/22
7:35 am-3:49 pm
Nonstop5h 14m
Provider | Price Accuracy | Trust Score* |
---|---|---|
Price Accuracy1 star | Trust Score*3 stars | |
Price Accuracy3 stars | Trust Score*2 stars | |
Price Accuracy3 stars | Trust Score*3 stars | |
Price Accuracy1 star | Trust Score*3 stars | |
Price Accuracy3 stars | Trust Score*3 stars | |
Price Accuracy3 stars | Trust Score*2 stars | |
Price Accuracy1 star | Trust Score*3 stars | |
Price Accuracy- | Trust Score*1 star |
The best time to book flights from Washington, D.C. to Seattle is 30 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $238). Flying from Washington, D.C. to Seattle in July is currently the most expensive (average of $411). 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.
It’s typically best to fly out from Washington, D.C. to Seattle in the afternoon. Doing so could potentially save you 24% on the flight price compared to flying in the morning, which is usually more expensive.
Travelers seeking maximum savings on their Washington, D.C. to Seattle flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from WAS to SEA are scheduled on a Wednesday (37 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 on average).
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
Overall
Food
Comfort
Entertainment
Crew
Boarding
Reviews
Cheri,Jan 2025
FAT - SEA
Overall
Food
Comfort
Entertainment
Crew
Boarding
Reviews
Cheri,Jan 2025
FAT - SEA
Overall
Food
Comfort
Entertainment
Crew
Boarding
Reviews
Cheri,Jan 2025
FAT - SEA
Overall
Food
Comfort
Entertainment
Crew
Boarding
Reviews
Cheri,Jan 2025
FAT - SEA
Overall
Food
Comfort
Entertainment
Crew
Boarding
Reviews
Cheri,Jan 2025
FAT - SEA
Overall
Food
Comfort
Entertainment
Crew
Boarding
Reviews
Cheri,Jan 2025
FAT - SEA
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$90 | Average$261 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$131 | Average$382 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$140 | Average$261 | FlexibilityNo cancel fee | On-time65% | |
Cheapest$144 | Average$362 | FlexibilityNo cancel fee | On-time83% | |
Cheapest$168 | Average$466 | FlexibilityNo cancel fee | On-time85% | |
Cheapest$206 | Average$404 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$207 | Average$449 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$258 | Average$497 | FlexibilityNo cancel fee | On-time75% | |
Cheapest$277 | Average$452 | FlexibilityNo cancel fee | On-time69% | |
Cheapest$306 | Average$543 | FlexibilityNo cancel fee | On-time63% |