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 July 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 53% of departures; flights ran 85% full.
Departures
176
July 2026
Seats
30,236
both directions
Passengers
25,778
both directions
Load factor
85.3%
RPM ÷ ASM
Who flies DCA–SEA?
Alaska Airlines operated the most nonstop DCA–SEA departures in July 2026 (118), one of 2 carriers on the route.
- AS
118 departures · 18,984 seats
Share of departures67.0%91.8%
Load
- DL
58 departures · 11,252 seats
Share of departures33.0%74.3%
Load
What plane flies DCA–SEA?
In July 2026, the Boeing 737-800 flew 53% of DCA–SEA departures — more than any other aircraft type.
- Boeing 737-800
94 departures · 91.9% load
53.4% - Airbus A321neo
58 departures · 74.3% load
33.0% - Boeing 737 MAX 8
24 departures · 91.2% load
13.6%
How has DCA–SEA traffic changed?
Nonstop DCA–SEA departures fell from 181 in August 2025 to 176 in July 2026.
Monthly nonstop DCA–SEA traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
June 2026
177 departures · 25,506 passengers
83.9%
Load
July 2026
176 departures · 25,778 passengers
85.3%
Load
By direction
Each direction is filed separately — they rarely match.
DCA → SEA
81.0% full
88 departures · 12,252 passengers
SEA → DCA
89.5% full
88 departures · 13,526 passengers
Nonstop DCA–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 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 July 2026, the Boeing 737-800 flew the largest share of departures (53.4%), followed by the Airbus A321neo (33.0%).
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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