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
Filed traffic dataIn May 2026, Alaska Airlines operated the most departures, one of 4 carriers flying nonstop SEA–SFO; the Embraer E175 was the most common aircraft at 16% of departures; flights ran 82% full.
Departures
1,177
May 2026
Seats
168,460
both directions
Passengers
138,326
both directions
Load factor
82.1%
RPM ÷ ASM
Who flies SEA–SFO?
Alaska Airlines operated the most nonstop SEA–SFO departures in May 2026 (432), one of 4 carriers on the route.
- AS
432 departures · 72,618 seats
Share of departures36.7%83.9%
Load
- UA
363 departures · 57,055 seats
Share of departures30.8%80.8%
Load
- DL
191 departures · 24,595 seats
Share of departures16.2%76.4%
Load
- OO
191 departures · 14,192 seats
Share of departures16.2%88.5%
Load
What plane flies SEA–SFO?
In May 2026, the Embraer E175 flew 16% of SEA–SFO departures — more than any other aircraft type.
- Embraer E175
191 departures · 88.5% load
16.2% - Airbus A220-300
174 departures · 77.9% load
14.8% - Boeing 737-900ER
163 departures · 83.4% load
13.9% - Boeing 737-800
159 departures · 79.8% load
13.5% - Boeing 737 MAX 9
150 departures · 85.2% load
12.7% - Airbus A320
149 departures · 77.5% load
12.7% - Boeing 737 MAX 8
92 departures · 85.3% load
7.8% - Airbus A319
43 departures · 88.0% load
3.6% - Boeing 737-700
36 departures · 86.8% load
3.1% - Airbus A220-100
11 departures · 84.2% load
0.9% - Airbus A321neo
7 departures · 48.4% load
0.6% - Boeing 757-200
2 departures · 27.8% load
0.2%
How has SEA–SFO traffic changed?
Nonstop SEA–SFO departures fell from 1,263 in June 2025 to 1,177 in May 2026.
Monthly nonstop SEA–SFO traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
1,177 departures · 138,326 passengers
82.1%
Load
By direction
Each direction is filed separately — they rarely match.
SFO → SEA
85.5% full
591 departures · 72,106 passengers
SEA → SFO
78.8% full
586 departures · 66,220 passengers
Nonstop SEA–SFO 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 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 May 2026, the Embraer E175 flew the largest share of departures (16.2%), followed by the Airbus A220-300 (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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