Washington (IAD) to Seattle / Tacoma (SEA) flight deal in economy from $209
IADWashington Dulles International Airport
Washington, United States
SEASeattle–Tacoma International Airport
Seattle / Tacoma, United States
$272 USD
-23%$209 USD
Verified 28 days agoDecember 2026
Mon
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Fair Availability
38% of dates checked are available within 10% of the lowest price
Wednesday, December 30th, 2026
Outbound Flights
6h 7m·Nonstop
$269 USD
IADDec 30 17:55
→SEADec 30 21:02
UA 1128Boeing 737MAX 9 Passenger
6h 7m·Nonstop
$322 USDIADDec 30 08:50
→SEADec 30 11:57
UA 2731Boeing 737
9h 1m·1 stop
$332 USDIADDec 30 13:05
→ORDDec 30 14:29
UA 2331Boeing 737MAX 9 Passenger
1h 51m layover
ORDDec 30 16:20
→SEADec 30 19:06
UA 1801Airbus A321neo
20h 34m·1 stop
$363 USDIADDec 30 22:45
→ORDDec 31 00:01
UA 421Boeing 737
13h 34m layover
ORDDec 31 13:35
→SEADec 31 16:19
UA 1764Boeing 737MAX 9 Passenger
8h 51m·1 stop
$392 USDIADDec 30 06:05
→EWRDec 30 07:20
UA 1359Boeing 737MAX 9 Passenger
1h 15m layover
EWRDec 30 08:35
→SEADec 30 11:56
UA 1330Boeing 737
9h 9m·1 stop
$409 USDIADDec 30 10:10
→ORDDec 30 11:37
UA 1252Boeing 737
1h 58m layover
ORDDec 30 13:35
→SEADec 30 16:19
UA 1764Boeing 737
16h 41m·1 stop
$412 USDIADDec 30 22:45
→ORDDec 31 00:01
UA 421Boeing 737
9h 28m layover
ORDDec 31 09:29
→SEADec 31 12:26
UA 2099Boeing 737
16h 12m·1 stop
$427 USDIADDec 30 22:44
→EWRDec 30 23:59
UA 1168Boeing 737
8h 36m layover·Overnight
EWRDec 31 08:35
→SEADec 31 11:56
UA 1330Boeing 737