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

Alaska Airlines, United Airlines, and Delta Air Lines fly nonstop between Washington (IAD) and Seattle (SEA), roughly 31 times a week. The timetable below shows the nonstop scheduled at 5h 42m to 6h 6m for the 2,300 miles. 2LNR checks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines flights on this route, so you can see which departures have space before you book.

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

Updated .

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31
Flights a week, 4-week average
5h 42m to 6h 6m
Scheduled flight time
2,300 mi
Nonstop distance
Free
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Washington to Seattle flight schedule

Scheduled nonstop departures for IAD to SEA starting October 23, 2026, last checked against our schedule feed on October 18, 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 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737 MAX 9
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737-900
UA 1824United Airlines13:0515:515h 46mBoeing 737 MAX 9
AS 737Alaska Airlines, Inc.17:3320:245h 51mBoeing 737 MAX 9
UA 1128United Airlines17:4520:375h 52mBoeing 737 MAX 9
AS 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737 MAX 9
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737-900
UA 1824United Airlines13:0515:515h 46mBoeing 737 MAX 9
AS 737Alaska Airlines, Inc.17:3320:275h 54m737
UA 1128United Airlines17:4520:375h 52mBoeing 737 MAX 9
AS 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737 MAX 9
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737-900
AS 737Alaska Airlines, Inc.17:3320:245h 51mBoeing 737 MAX 9
UA 1128United Airlines17:4520:375h 52mBoeing 737 MAX 9
AS 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737-900
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737 MAX 9
AS 737Alaska Airlines, Inc.17:3320:245h 51mBoeing 737 MAX 9
UA 1128United Airlines17:4520:375h 52mBoeing 737 MAX 9
AS 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737 MAX 9
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737 MAX 9
AS 737Alaska Airlines, Inc.17:3320:275h 54m737
UA 1128United Airlines17:5020:566h 6mBoeing 737 MAX 9
AS 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737 MAX 9
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737-900
AS 737Alaska Airlines, Inc.17:3320:275h 54m737
UA 1128United Airlines17:5020:566h 6mBoeing 737 MAX 9
AS 409Alaska Airlines, Inc.07:0209:445h 42mBoeing 737-900
DL 1015Delta Air Lines07:0509:565h 51mAirbus A220-300
AS 375Alaska Airlines, Inc.09:3812:205h 42mBoeing 737-800
AS 737Alaska Airlines, Inc.17:3320:245h 51mBoeing 737 MAX 9
UA 1128United Airlines17:4520:375h 52mBoeing 737 MAX 9

Showing all 37 scheduled IAD to SEA departures across 7 days with service, starting October 23, 2026. Later dates are 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 hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure.

See every IAD to SEA date on the interactive map

Aircraft on the Washington to Seattle nonstop

In the schedule table on this page, Alaska Airlines flies the Boeing 737 MAX 9, the Boeing 737-900, the Boeing 737, and the Boeing 737-800. United Airlines flies the Boeing 737 MAX 9. Delta Air Lines flies the Airbus A220-300. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure.

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.

In the 7 days to October 19, 2026, 2LNR checked award space on Washington to Seattle departures from October 19 to November 1. Alaska Airlines had space open on 7 of 14 dates checked and Delta Air Lines on 13 of 14.

See real availability

Confirmed upgrade or award seats by date on the IAD to SEA departures 2LNR tracks, checked against live inventory so you know what's open before you book.

Set an alert

Premium inventory turns over fast. Watch this route on Pro and 2LNR notifies you when space appears on a date you're 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. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date.

See IAD to SEA on the interactive map →

Frequently asked questions about IAD to SEA

How long is the flight from Washington (IAD) to Seattle (SEA)?
Scheduled flight times from Washington (IAD) to Seattle (SEA) run from 5h 42m to 6h 6m across the departures in the schedule table on this page. The nonstop covers about 2,300 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.
Which airlines fly nonstop from IAD to SEA?
Alaska Airlines, United Airlines, and Delta Air Lines fly IAD to SEA 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 31 nonstop flights a week run between Washington (IAD) and Seattle (SEA) in the current schedule, operated by Alaska Airlines, United 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 07:02 and 17:50, local time at Washington. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
Which flights operate IAD to SEA nonstop?
In the schedule table on this page, IAD to SEA nonstops fly as AS 375, AS 409, and AS 737 on Alaska Airlines; UA 1128 and UA 1824 on United Airlines; and DL 1015 on Delta Air Lines. The table lists each departure by date with its times 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.

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

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