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
Friday, December 18th, 2026
Outbound Flights
17h 17m·1 stop
$323 USD
IADDec 18 08:15
→ORDDec 18 09:40
UA 1775Airbus A321neo
10h 2m layover
ORDDec 18 19:42
→SEADec 18 22:32
UA 2798Airbus A321neo
6h 7m·Nonstop
$343 USDIADDec 18 17:55
→SEADec 18 21:02
UA 1128Boeing 737MAX 9 Passenger
6h 7m·Nonstop
$353 USDIADDec 18 08:50
→SEADec 18 11:57
UA 2731Boeing 737
20h 34m·1 stop
$407 USDIADDec 18 22:45
→ORDDec 19 00:01
UA 421Boeing 737
13h 34m layover
ORDDec 19 13:35
→SEADec 19 16:19
UA 1764Boeing 737
9h 9m·1 stop
$427 USDIADDec 18 10:10
→ORDDec 18 11:37
UA 1252Boeing 737
1h 58m layover
ORDDec 18 13:35
→SEADec 18 16:19
UA 1764Boeing 737
9h 1m·1 stop
$432 USDIADDec 18 13:05
→ORDDec 18 14:29
UA 2331Boeing 737MAX 9 Passenger
1h 51m layover
ORDDec 18 16:20
→SEADec 18 19:06
UA 1801Airbus A321neo
9h·1 stop
$602 USDIADDec 18 14:40
→SFODec 18 17:50
UA 2862Boeing 737MAX 9 Passenger
42m layover
SFODec 18 18:32
→SEADec 18 20:40
UA 2159Boeing 737
8h 28m·1 stop
$614 USDIADDec 18 12:39
→DENDec 18 14:51
UA 1587Airbus A321neo
1h 14m layover
DENDec 18 16:05
→SEADec 18 18:07
UA 2013Boeing 737