Washington (DCA) to Seattle (SEA)
Flight time
≈ 5h 27m
Bearing
300° NW
Washington (DCA) to Seattle (SEA) is 2,323 miles (3,738 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies DCA–SEA
Filed traffic dataIn May 2026, Alaska Airlines operated the most departures, one of 2 carriers flying nonstop DCA–SEA; the Boeing 737-800 was the most common aircraft at 54% of departures; flights ran 85% full.
Departures
186
May 2026
Seats
31,703
both directions
Passengers
26,868
both directions
Load factor
84.8%
RPM ÷ ASM
Who flies DCA–SEA?
Alaska Airlines operated the most nonstop DCA–SEA departures in May 2026 (124), one of 2 carriers on the route.
- AS
124 departures · 19,942 seats
Share of departures66.7%89.4%
Load
- DL
62 departures · 11,761 seats
Share of departures33.3%76.9%
Load
What plane flies DCA–SEA?
In May 2026, the Boeing 737-800 flew 54% of DCA–SEA departures — more than any other aircraft type.
- Boeing 737-800
100 departures · 89.2% load
53.8% - Airbus A321neo
52 departures · 75.4% load
28.0% - Boeing 737 MAX 8
24 departures · 90.0% load
12.9% - Boeing 757-200
10 departures · 86.1% load
5.4%
How has DCA–SEA traffic changed?
Nonstop DCA–SEA departures rose from 177 in June 2025 to 186 in May 2026.
Monthly nonstop DCA–SEA traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
June 2025
177 departures · 26,303 passengers
87.1%
Load
July 2025
172 departures · 25,404 passengers
86.5%
Load
August 2025
181 departures · 27,164 passengers
91.7%
Load
September 2025
179 departures · 23,767 passengers
82.0%
Load
October 2025
186 departures · 24,345 passengers
80.7%
Load
November 2025
174 departures · 22,543 passengers
79.4%
Load
December 2025
181 departures · 24,837 passengers
84.6%
Load
January 2026
176 departures · 21,798 passengers
76.1%
Load
February 2026
166 departures · 20,869 passengers
77.2%
Load
March 2026
175 departures · 24,633 passengers
86.5%
Load
April 2026
180 departures · 25,263 passengers
86.0%
Load
May 2026
186 departures · 26,868 passengers
84.8%
Load
By direction
Each direction is filed separately — they rarely match.
DCA → SEA
84.1% full
93 departures · 13,324 passengers
SEA → DCA
85.4% full
93 departures · 13,544 passengers
Nonstop DCA–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Washington (DCA) from Seattle (SEA)?
DCA to SEA is 2,323 miles (3,738 km / 2,018 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from DCA to SEA?
A nonstop covers the 2,323-mile great-circle distance in roughly 5h 27m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies DCA–SEA?
In May 2026, the Boeing 737-800 flew the largest share of departures (53.8%), followed by the Airbus A321neo (28.0%).
What mileage do I earn flying DCA–SEA?
Distance-based programs credit off the 2,323-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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