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
Sunday, December 20th, 2026
Outbound Flights
6h 7m·Nonstop
$269 USD
IADDec 20 17:55
→SEADec 20 21:02
UA 1128Boeing 737MAX 9 Passenger
9h 1m·1 stop
$279 USDIADDec 20 13:05
→ORDDec 20 14:29
UA 2331Boeing 737MAX 9 Passenger
1h 51m layover
ORDDec 20 16:20
→SEADec 20 19:06
UA 1801Airbus A321neo
9h 9m·1 stop
$296 USDIADDec 20 10:10
→ORDDec 20 11:37
UA 1252Boeing 737
1h 58m layover
ORDDec 20 13:35
→SEADec 20 16:19
UA 1764Boeing 737
9h 16m·1 stop
$336 USDIADDec 20 06:10
→ORDDec 20 07:32
UA 565Airbus A319
1h 57m layover
ORDDec 20 09:29
→SEADec 20 12:26
UA 2099Boeing 737
6h 7m·Nonstop
$366 USDIADDec 20 08:50
→SEADec 20 11:57
UA 2731Boeing 737
8h 51m·1 stop
$569 USDIADDec 20 06:05
→EWRDec 20 07:20
UA 1359Boeing 737MAX 9 Passenger
1h 15m layover
EWRDec 20 08:35
→SEADec 20 11:56
UA 1330Boeing 737
8h 54m·1 stop
$582 USDIADDec 20 12:35
→SFODec 20 15:42
UA 1434Boeing 737MAX 9 Passenger
35m layover
SFODec 20 16:17
→SEADec 20 18:29
UA 2279Airbus A320
8h 28m·1 stop
$588 USDIADDec 20 12:39
→DENDec 20 14:51
UA 1587Airbus A321neo
1h 14m layover
DENDec 20 16:05
→SEADec 20 18:07
UA 2013Boeing 737