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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Sun
Fair Availability
38% of dates checked are available within 10% of the lowest price
Sunday, December 6th, 2026
Outbound Flights
6h 6m·Nonstop
$229 USD
IADDec 6 17:55
→SEADec 6 21:01
UA 1128Boeing 737MAX 9 Passenger
9h 11m·1 stop
$239 USDIADDec 6 08:15
→SFODec 6 11:20
UA 1147Boeing 757
49m layover
SFODec 6 12:09
→SEADec 6 14:26
UA 1264Boeing 737MAX 9 Passenger
9h 8m·1 stop
$239 USDIADDec 6 10:10
→ORDDec 6 11:33
UA 635Boeing 737
1h 57m layover
ORDDec 6 13:30
→SEADec 6 16:18
UA 2844Airbus A321neo
9h 5m·1 stop
$239 USDIADDec 6 06:15
→SFODec 6 09:22
UA 1095Boeing 737MAX 9 Passenger
43m layover
SFODec 6 10:05
→SEADec 6 12:20
UA 2192Airbus A320
10h 37m·1 stop
$239 USDIADDec 6 08:35
→LAXDec 6 11:24
UA 1734Boeing 757
1h 41m layover
LAXDec 6 13:05
→SEADec 6 16:12
UA 6043Embraer 175
9h 12m·1 stop
$315 USDIADDec 6 14:35
→SFODec 6 17:46
UA 2862Boeing 737MAX 9 Passenger
47m layover
SFODec 6 18:33
→SEADec 6 20:47
UA 1497Airbus A320
8h 49m·1 stop
$323 USDIADDec 6 12:35
→DENDec 6 14:44
UA 561Airbus A321neo
1h 36m layover
DENDec 6 16:20
→SEADec 6 18:24
UA 2013Boeing 737
8h 27m·1 stop
$323 USDIADDec 6 08:22
→DENDec 6 10:26
UA 792Boeing 777
1h 19m layover
DENDec 6 11:45
→SEADec 6 13:49
UA 310Boeing 737