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
Monday, December 28th, 2026
Outbound Flights
6h 7m·Nonstop
$333 USD
IADDec 28 08:50
→SEADec 28 11:57
UA 2731Boeing 737
6h 7m·Nonstop
$333 USDIADDec 28 17:55
→SEADec 28 21:02
UA 1128Boeing 737MAX 9 Passenger
9h 9m·1 stop
$409 USDIADDec 28 10:10
→ORDDec 28 11:37
UA 1252Boeing 737
1h 58m layover
ORDDec 28 13:35
→SEADec 28 16:19
UA 1764Boeing 737
8h 51m·1 stop
$416 USDIADDec 28 06:05
→EWRDec 28 07:20
UA 1359Boeing 737MAX 9 Passenger
1h 15m layover
EWRDec 28 08:35
→SEADec 28 11:56
UA 1330Boeing 737
14h 37m·1 stop
$467 USDIADDec 28 22:12
→DENDec 29 00:15
UA 495Airbus A321neo
7h 25m layover
DENDec 29 07:40
→SEADec 29 09:49
UA 2271Boeing 737
16h 12m·1 stop
$477 USDIADDec 28 22:44
→EWRDec 28 23:59
UA 1168Boeing 737
8h 36m layover·Overnight
EWRDec 29 08:35
→SEADec 29 11:56
UA 1330Boeing 737
9h 26m·2 stops
$496 USDIADDec 28 12:40
→CKBDec 28 13:45
UA 6071Canadair RJ 200
35m layover
CKBDec 28 14:20
→ORDDec 28 15:28
UA 6073Canadair RJ 200
52m layover
ORDDec 28 16:20
→SEADec 28 19:06
UA 1801Airbus A321neo
9h 1m·1 stop
$563 USDIADDec 28 13:05
→ORDDec 28 14:29
UA 2331Boeing 737MAX 9 Passenger
1h 51m layover
ORDDec 28 16:20
→SEADec 28 19:06
UA 1801Airbus A321neo