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
Saturday, December 19th, 2026
Outbound Flights
17h 17m·1 stop
$323 USD
IADDec 19 08:15
→ORDDec 19 09:40
UA 1775Airbus A321neo
10h 2m layover
ORDDec 19 19:42
→SEADec 19 22:32
UA 2798Airbus A321neo
6h 7m·Nonstop
$335 USDIADDec 19 17:55
→SEADec 19 21:02
UA 1128Boeing 737MAX 9 Passenger
13h 9m·1 stop
$407 USDIADDec 19 06:10
→ORDDec 19 07:32
UA 565Boeing 737MAX 9 Passenger
6h 3m layover
ORDDec 19 13:35
→SEADec 19 16:19
UA 1764Boeing 737
13h 51m·1 stop
$407 USDIADDec 19 08:15
→ORDDec 19 09:40
UA 1775Airbus A321neo
6h 40m layover
ORDDec 19 16:20
→SEADec 19 19:06
UA 1801Airbus A321neo
9h 1m·1 stop
$416 USDIADDec 19 13:05
→ORDDec 19 14:29
UA 2331Boeing 737
1h 51m layover
ORDDec 19 16:20
→SEADec 19 19:06
UA 1801Airbus A321neo
6h 7m·Nonstop
$421 USDIADDec 19 08:50
→SEADec 19 11:57
UA 2731Boeing 737
9h 14m·1 stop
$546 USDIADDec 19 10:05
→ORDDec 19 11:32
UA 1252Boeing 737
2h 3m layover
ORDDec 19 13:35
→SEADec 19 16:19
UA 1764Boeing 737
8h 25m·1 stop
$614 USDIADDec 19 12:39
→DENDec 19 14:51
UA 1587Airbus A321neo
1h 11m layover
DENDec 19 16:02
→SEADec 19 18:04
UA 2013Boeing 737