Seattle (SEA) to San Francisco (SFO)
Flight time
≈ 2h 09m
Bearing
180° S
Seattle (SEA) to San Francisco (SFO) is 679 miles (1,093 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies SEA–SFO
US DOT T-100 · filed dataIn April 2026, Alaska Airlines operated the most departures, one of 4 carriers flying nonstop SEA–SFO; the Boeing 737-800 was the most common aircraft at 21% of departures; flights ran 85% full.
Departures
993
April 2026
Seats
143,748
both directions
Passengers
121,651
both directions
Load factor
84.6%
passengers ÷ seats
Who flies SEA–SFO?
Alaska Airlines operated the most nonstop SEA–SFO departures in April 2026 (396), one of 4 carriers on the route.
- AS
Alaska Airlines
396 departures · 66,409 seats
Share of departures39.9%85.1%
Load
- UA
United Airlines
302 departures · 47,213 seats
Share of departures30.4%85.3%
Load
- DL
Delta Air Lines
158 departures · 19,996 seats
Share of departures15.9%77.9%
Load
- OO
SkyWest Airlines
137 departures · 10,130 seats
Share of departures13.8%91.4%
Load
What plane flies SEA–SFO?
In April 2026, the Boeing 737-800 flew 21% of SEA–SFO departures — more than any other aircraft type.
- Boeing 737-800
210 departures · 84.3% load
21.1% - Boeing 737 MAX 9
147 departures · 82.6% load
14.8% - Embraer E175
137 departures · 91.4% load
13.8% - Boeing 737-900ER
117 departures · 83.5% load
11.8% - Boeing 737 MAX 8
90 departures · 89.9% load
9.1% - Airbus A220-300
66 departures · 70.8% load
6.7% - Airbus A320
66 departures · 82.0% load
6.7% - Airbus A220-100
62 departures · 89.3% load
6.2% - Airbus A319
62 departures · 91.2% load
6.2% - Boeing 737-700
30 departures · 89.5% load
3.0% - Airbus A321neo
4 departures · 70.8% load
0.4% - Boeing 757-200
2 departures · 63.9% load
0.2%
How has SEA–SFO traffic changed?
Nonstop SEA–SFO departures fell from 1,268 in May 2025 to 993 in April 2026.
Monthly nonstop SEA–SFO traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
1,268 departures · 145,117 passengers
77.8%
Load
June 2025
1,263 departures · 150,456 passengers
83.7%
Load
July 2025
1,260 departures · 160,314 passengers
87.4%
Load
August 2025
1,235 departures · 162,090 passengers
88.8%
Load
September 2025
1,165 departures · 142,153 passengers
81.4%
Load
October 2025
1,158 departures · 135,888 passengers
79.0%
Load
November 2025
1,118 departures · 129,672 passengers
78.5%
Load
December 2025
1,115 departures · 130,770 passengers
80.1%
Load
January 2026
960 departures · 111,157 passengers
78.7%
Load
February 2026
963 departures · 112,907 passengers
81.7%
Load
March 2026
1,029 departures · 122,433 passengers
84.5%
Load
April 2026
993 departures · 121,651 passengers
84.6%
Load
By direction
The DOT files each direction separately — they rarely match.
SFO → SEA
84.8% full
497 departures · 61,054 passengers
SEA → SFO
84.4% full
496 departures · 60,597 passengers
Nonstop SEA–SFO traffic has been filed with the US DOT since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through April 2026; filings from 2025. Public domain (US Government work). The DOT publishes roughly three months in arrears.
The airports
Frequently asked
How far is Seattle (SEA) from San Francisco (SFO)?
SEA to SFO is 679 miles (1,093 km / 590 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from SEA to SFO?
A nonstop covers the 679-mile great-circle distance in roughly 2h 09m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies SEA–SFO?
In April 2026, the Boeing 737-800 flew the largest share of departures (21.1%), followed by the Boeing 737 MAX 9 (14.8%).
What mileage do I earn flying SEA–SFO?
Distance-based programs credit off the 679-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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