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
Tuesday, December 29th, 2026
Outbound Flights
6h 7m·Nonstop
$289 USD
IADDec 29 17:55
→SEADec 29 21:02
UA 1128Boeing 737MAX 9 Passenger
6h 7m·Nonstop
$374 USDIADDec 29 08:50
→SEADec 29 11:57
UA 2731Boeing 737
8h 51m·1 stop
$409 USDIADDec 29 06:05
→EWRDec 29 07:20
UA 1359Boeing 737MAX 9 Passenger
1h 15m layover
EWRDec 29 08:35
→SEADec 29 11:56
UA 1330Boeing 737
11h 56m·1 stop
$412 USDIADDec 29 10:10
→ORDDec 29 11:37
UA 1252Boeing 737
4h 43m layover
ORDDec 29 16:20
→SEADec 29 19:06
UA 1801Airbus A321neo
9h 1m·1 stop
$421 USDIADDec 29 13:05
→ORDDec 29 14:29
UA 2331Boeing 737MAX 9 Passenger
1h 51m layover
ORDDec 29 16:20
→SEADec 29 19:06
UA 1801Airbus A321neo
9h 9m·1 stop
$421 USDIADDec 29 10:10
→ORDDec 29 11:37
UA 1252Boeing 737
1h 58m layover
ORDDec 29 13:35
→SEADec 29 16:19
UA 1764Boeing 737
14h 37m·1 stop
$467 USDIADDec 29 22:12
→DENDec 30 00:15
UA 495Airbus A321neo
7h 25m layover
DENDec 30 07:40
→SEADec 30 09:49
UA 2271Boeing 737
8h 28m·1 stop
$614 USDIADDec 29 12:39
→DENDec 29 14:51
UA 1587Airbus A321neo
1h 14m layover
DENDec 29 16:05
→SEADec 29 18:07
UA 2013Boeing 737