Washington to Seattle (IAD-SEA): nonstop upgrade & award space

United Airlines, Alaska Airlines, and Delta Air Lines fly nonstop between Washington (IAD) and Seattle (SEA), roughly 58 times a week. United Airlines carries most of this long-haul schedule, so one carrier's release pattern decides when premium space appears, and it is rarely all at once. 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines, on every IAD to SEA departure, so you know which flights have space before you book.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

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58
Nonstop flights a week
2,300 mi
Nonstop distance
Free
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Washington to Seattle flight schedule

Scheduled nonstop departures for IAD to SEA, last checked against our schedule feed on September 6, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Washington (IAD) to Seattle (SEA)
Date Flight Airline Departs IAD Arrives SEA Duration Aircraft
AS 1574Alaska Airlines, Inc.07:0009:375h 37m7M9
DL 1015Delta Air Lines07:2510:055h 40m223
AS 375Alaska Airlines, Inc.09:0311:395h 36m73J
UA 2799United Airlines12:5715:435h 46m739
UA 2241United Airlines13:1015:555h 45m7M9
UA 326United Airlines17:5520:465h 51m7M9
AS 737Alaska Airlines, Inc.17:5720:445h 47m7M9
UA 1128United Airlines18:0020:455h 45m738
AS 1574Alaska Airlines, Inc.07:0009:375h 37m737
DL 1015Delta Air Lines07:2510:055h 40m223
AS 375Alaska Airlines, Inc.09:0311:395h 36m73J
UA 2241United Airlines13:1015:555h 45m7M9
UA 2799United Airlines13:2016:065h 46m739
UA 326United Airlines17:5520:465h 51m7M9
UA 1128United Airlines18:0020:455h 45m738
AS 737Alaska Airlines, Inc.18:1421:095h 55m73J
AS 1574Alaska Airlines, Inc.07:0009:375h 37m73J
DL 1015Delta Air Lines07:2510:055h 40m223
AS 375Alaska Airlines, Inc.09:0311:395h 36m73J
UA 2241United Airlines13:1015:555h 45m7M9
UA 2799United Airlines13:2016:065h 46m739
UA 326United Airlines17:5520:465h 51m7M9
UA 1128United Airlines18:0020:455h 45m738
AS 737Alaska Airlines, Inc.18:1421:095h 55m73J
AS 1574Alaska Airlines, Inc.07:0009:375h 37m7M9
DL 1015Delta Air Lines07:2510:055h 40m223
AS 375Alaska Airlines, Inc.09:0311:395h 36m73J
UA 2241United Airlines13:1015:555h 45m7M9
UA 2799United Airlines13:2016:065h 46m739
UA 1128United Airlines18:0020:455h 45m738
AS 737Alaska Airlines, Inc.18:1421:095h 55m73J
AS 1574Alaska Airlines, Inc.07:0009:375h 37m7M9
DL 1015Delta Air Lines07:2510:055h 40m223
AS 375Alaska Airlines, Inc.09:0311:395h 36m7M9
UA 2241United Airlines13:1015:555h 45m7M9
UA 2799United Airlines13:2016:065h 46m739
UA 326United Airlines17:5520:465h 51m7M9
UA 1128United Airlines18:0020:455h 45m738
AS 737Alaska Airlines, Inc.18:1421:095h 55m73J
AS 1574Alaska Airlines, Inc.07:0009:375h 37m737

Showing the first 40 of 54 scheduled IAD to SEA departures across the next 7 days with service. Every remaining date is on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline has not filed that value in the schedule data we hold. Aircraft are IATA equipment codes as filed, and can change up to departure.

See every IAD to SEA date on the interactive map

Confirmed upgrade & award space on IAD to SEA departures

2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines, segment by segment and date by date. Open the calendar for Washington to Seattle to see which departures have space, the next 14 days free on every product and the full horizon on Pro.

See real availability

Confirmed upgrade and award seats on each IAD to SEA departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See IAD to SEA on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Washington to Seattle nonstop

Carriers operating IAD to SEA nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

See IAD to SEA on the interactive map →

Frequently asked questions about IAD to SEA

How far is Seattle from Washington?
IAD to SEA covers about 2,300 miles nonstop. Flight times vary by aircraft and season; the schedule table on this page lists each scheduled departure with its own times.
Which airlines fly nonstop from IAD to SEA?
United Airlines, Alaska Airlines, and Delta Air Lines fly the route nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines.
How many flights a week are there from IAD to SEA?
About 58 nonstop flights a week run between Washington and Seattle in the current schedule, operated by United Airlines, Alaska Airlines, and Delta Air Lines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.
What time do flights from IAD to SEA depart?
Scheduled IAD to SEA nonstops in the next 7 days with service leave between 07:00 and 18:14, local time at Washington. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
How do I check upgrade or award availability on IAD to SEA?
Open the IAD to SEA route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines and Delta Air Lines, the next 14 days free and the full horizon on Pro. On Pro you can also set an alert on the route and 2LNR notifies you when space opens.

Never miss IAD to SEA upgrade or award space

See what is open by date on this route, the next 14 days free on every product and the full horizon on Pro.

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