Washington (DCA) to Seattle (SEA) flights: who flies it

Washington to Seattle flight schedule

Scheduled nonstop departures for DCA 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.

Scheduled nonstop departures from Washington (DCA) to Seattle (SEA)
Date	Flight	Airline	Departs DCA	Arrives SEA	Duration	Aircraft
Fri, Oct 23	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737-800
Fri, Oct 23	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Fri, Oct 23	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737 MAX 8
Sat, Oct 24	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737-800
Sat, Oct 24	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Sat, Oct 24	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737 MAX 8
Sun, Oct 25	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737 MAX 8
Sun, Oct 25	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Sun, Oct 25	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737 MAX 8
Mon, Oct 26	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737-800
Mon, Oct 26	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Mon, Oct 26	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737-800
Tue, Oct 27	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737 MAX 8
Tue, Oct 27	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Tue, Oct 27	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737-800
Wed, Oct 28	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737 MAX 8
Wed, Oct 28	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Wed, Oct 28	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737 MAX 8
Thu, Oct 29	AS 1	Alaska Airlines, Inc.	08:00	10:59	5h 59m	Boeing 737 MAX 8
Thu, Oct 29	DL 786	Delta Air Lines	16:45	19:35	5h 50m	Airbus A321neo family
Thu, Oct 29	AS 3	Alaska Airlines, Inc.	17:00	19:55	5h 55m	Boeing 737 MAX 8

Showing all 21 scheduled DCA 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 DCA 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 8 and the Boeing 737-800, and Delta Air Lines flies the Airbus A321neo family. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure.

Confirmed upgrade & award space on DCA 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 1 of 14 dates checked and Delta Air Lines on 11 of 14.

See real availability

Confirmed upgrade or award seats by date on the DCA 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 DCA to SEA on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Washington to Seattle nonstop

Carriers operating DCA to SEA nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date.

See DCA to SEA on the interactive map →

Frequently asked questions about DCA to SEA

How long is the flight from Washington (DCA) to Seattle (SEA)?

Scheduled flight times from Washington (DCA) to Seattle (SEA) run from 5h 50m to 5h 59m across the departures in the schedule table on this page. The nonstop covers about 2,322 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.

Which airlines fly nonstop from DCA to SEA?

Alaska Airlines and Delta Air Lines fly DCA 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 DCA to SEA?

About 21 nonstop flights a week run between Washington (DCA) and Seattle (SEA) in the current schedule, operated by 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 DCA to SEA depart?

Scheduled DCA to SEA nonstops in the next 7 days with service leave between 08:00 and 17:00, local time at Washington. The schedule table on this page lists every departure by date, with its arrival time and aircraft.

Which flights operate DCA to SEA nonstop?

In the schedule table on this page, DCA to SEA nonstops fly as AS 1 and AS 3 on Alaska Airlines, and DL 786 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 DCA to SEA?

Open the DCA 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.