Baltimore (BWI) to Seattle (SEA)
Flight time
≈ 5h 27m
Bearing
299° NW
Baltimore (BWI) to Seattle (SEA) is 2,329 miles (3,748 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies BWI–SEA
Filed traffic dataIn June 2026, Alaska Airlines operated the most departures, one of 3 carriers flying nonstop BWI–SEA; the Boeing 737-900ER was the most common aircraft at 35% of departures; flights ran 91% full.
Departures
175
June 2026
Seats
30,634
both directions
Passengers
27,895
both directions
Load factor
91.1%
RPM ÷ ASM
Who flies BWI–SEA?
Alaska Airlines operated the most nonstop BWI–SEA departures in June 2026 (120), one of 3 carriers on the route.
- AS
120 departures · 21,360 seats
Share of departures68.6%90.6%
Load
- WN
54 departures · 9,108 seats
Share of departures30.9%93.3%
Load
- UA
1 departures · 166 seats
Share of departures0.6%21.1%
Load
What plane flies BWI–SEA?
In June 2026, the Boeing 737-900ER flew 35% of BWI–SEA departures — more than any other aircraft type.
- Boeing 737-900ER
61 departures · 90.4% load
34.9% - Boeing 737 MAX 9
59 departures · 90.8% load
33.7% - Boeing 737 MAX 8
24 departures · 89.4% load
13.7% - Boeing 737-800
22 departures · 94.0% load
12.6% - Boeing 737-700
9 departures · 95.1% load
5.1%
How has BWI–SEA traffic changed?
Nonstop BWI–SEA departures fell from 182 in July 2025 to 175 in June 2026.
Monthly nonstop BWI–SEA traffic, trailing 12 months through June 2026. Bars scale to the busiest month; months with no filed service show as zero.
July 2025
182 departures · 28,482 passengers
93.0%
Load
August 2025
186 departures · 29,346 passengers
93.1%
Load
September 2025
181 departures · 27,468 passengers
88.6%
Load
October 2025
111 departures · 16,296 passengers
83.1%
Load
November 2025
105 departures · 14,196 passengers
76.0%
Load
December 2025
121 departures · 17,609 passengers
82.4%
Load
January 2026
69 departures · 9,215 passengers
75.7%
Load
February 2026
55 departures · 7,457 passengers
77.6%
Load
March 2026
62 departures · 9,825 passengers
89.9%
Load
April 2026
75 departures · 11,410 passengers
85.5%
Load
May 2026
116 departures · 17,866 passengers
87.1%
Load
June 2026
175 departures · 27,895 passengers
91.1%
Load
By direction
Each direction is filed separately — they rarely match.
SEA → BWI
90.1% full
88 departures · 14,036 passengers
BWI → SEA
92.0% full
87 departures · 13,859 passengers
Nonstop BWI–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through June 2026; filings from 2025. Public domain (US Government work).
The airports
Baltimore
US
Baltimore/Washington International Thurgood Marshall Airport
Coordinates
39.18°N, 76.67°W
Hemisphere
N · W
Frequently asked
How far is Baltimore (BWI) from Seattle (SEA)?
BWI to SEA is 2,329 miles (3,748 km / 2,024 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from BWI to SEA?
A nonstop covers the 2,329-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 BWI–SEA?
In June 2026, the Boeing 737-900ER flew the largest share of departures (34.9%), followed by the Boeing 737 MAX 9 (33.7%).
What mileage do I earn flying BWI–SEA?
Distance-based programs credit off the 2,329-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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