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 21st, 2026
Outbound Flights
8h 12m·1 stop
$239 USD
IADDec 21 17:20
→ORDDec 21 18:50
UA 2497Boeing 737
52m layover
ORDDec 21 19:42
→SEADec 21 22:32
UA 2798Airbus A321neo
11h 4m·1 stop
$251 USDIADDec 21 08:15
→ORDDec 21 09:40
UA 1775Airbus A321neo
3h 55m layover
ORDDec 21 13:35
→SEADec 21 16:19
UA 1764Boeing 737
9h 9m·1 stop
$271 USDIADDec 21 10:10
→ORDDec 21 11:37
UA 1252Boeing 737
1h 58m layover
ORDDec 21 13:35
→SEADec 21 16:19
UA 1764Boeing 737
6h 7m·Nonstop
$286 USDIADDec 21 17:55
→SEADec 21 21:02
UA 1128Boeing 737MAX 9 Passenger
6h 7m·Nonstop
$289 USDIADDec 21 08:50
→SEADec 21 11:57
UA 2731Boeing 737
16h 41m·1 stop
$320 USDIADDec 21 22:45
→ORDDec 22 00:01
UA 421Boeing 737
9h 28m layover
ORDDec 22 09:29
→SEADec 22 12:26
UA 2099Boeing 737
9h 1m·1 stop
$332 USDIADDec 21 13:05
→ORDDec 21 14:29
UA 2331Boeing 737MAX 9 Passenger
1h 51m layover
ORDDec 21 16:20
→SEADec 21 19:06
UA 1801Airbus A321neo
8h 51m·1 stop
$433 USDIADDec 21 06:05
→EWRDec 21 07:20
UA 1359Boeing 737MAX 9 Passenger
1h 15m layover
EWRDec 21 08:35
→SEADec 21 11:56
UA 1330Boeing 737