King County International Airport - Boeing Field
Seattle, United StatesBFI / KBFI
Regional airport · 63 direct destinations · 2 runways · longest runway 10,007 ft
46 °F · Partly cloudySource: METAR observation via the NOAA Aviation Weather Center
Route
Seattle → San Francisco
BFI
SeattleKing County International Airport - Boeing Field
SeattleKing County International Airport - Boeing FieldSFOSan FranciscoSan Francisco International Airport
San FranciscoSan Francisco International Airport- Distance
- 685 mi
- Estimated flight time
- ~1h 55m
Same local time in Seattle and San Francisco.
Observed nonstop
How often does this route fly?
Frequency
Daily at most
On average around 1 flights a day, observed from October 2025 to September 2026.
- 1
- flights per day
- 2
- busiest month · Apr
- 1
- quietest month · Oct
- 1 hr 43 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 1Jan2026
- 1Feb
- 1Mar
- 2Apr
- 1May
- 1Jun
- 1Jul
- 1Aug
- 1Sep
- 1Oct2025
- 1Nov
- 1Dec
In December 2025 we saw less traffic at Seattle in general than usual; compare that month with care.
Airlines
Who flies it
Regency Airlinesnow and then
United Airlinesnow and then
Through the day
Departure times
Local time in Seattle. Most departures between 14:00 and 17:00.
- 00:00
- 01:00
- 02:00
- 03:00
- 04:00
- 05:00
- 06:00
- 07:00
- 08:00
- 09:00
- 10:00
- 11:00
- 12:00
- 13:00
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
Through the week
By weekday
- 0.6Mon
- 1.2Tue
- 0.9Wed
- 0.9Thu
- 0.9Fri
- 0.8Sat
- 0.6Sun
Fleet
Aircraft observed
- Cessna Citation LatitudeC68A15%
- Cessna Citation LongitudeC7009%
- Bombardier Challenger 350CL359%
- Bombardier Global ExpressGLEX6%
- Embraer Phenom 300E55P5%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 1 | 18 | – |
| February 2026 | 1 | 28 | – |
| March 2026 | 1 | 38 | – |
| April 2026 | 2 | 23 | – |
| May 2026 | 1 | 25 |
|
| June 2026 | 1 | 28 |
|
| July 2026 | 1 | 25 | – |
| August 2026 | 1 | 19 | – |
| September 2026 | 1 | 38 | – |
| October 2025 | 1 | 22 |
|
| November 2025 | 1 | 22 | – |
| December 2025 | 1 | 16 |
|
Airlines observed on this route
From observed callsign routes on BFI-SFO - not a booking guarantee.
About this route
- Domestic route: both airports are in the same country.
- The opposite direction has also been observed as a direct connection.
- Direct destinations observed from Seattle: 63.
- Direct destinations observed from San Francisco: 130.
The airports on this route
San Francisco International Airport
San Francisco, United StatesSFO / KSFO
International hub · 130 direct destinations · 4 runways · longest runway 11,870 ft
60 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center
Alternative airports for this journey
Same journey, a different airport nearby - with an observed direct connection.
SEA SFOSeattle–Tacoma International AirportSeattle is about 6 mi from Seattle.View route →BFI OAKOakland San Francisco Bay AirportOakland is about 11 mi from San Francisco.View route →PAE SFOSeattle Paine Field International AirportEverett is about 26 mi from Seattle.View route →BFI SJCMineta San Jose International AirportSan Jose is about 30 mi from San Francisco.View route →
About the route from Seattle to San Francisco
The observed direct connection between King County International Airport - Boeing Field (BFI) and San Francisco International Airport (SFO) covers approximately 685 mi. The estimated flight time is around 1h 55m. Regency Airlines and United Airlines have been observed on this connection in the available route data.
Frequently asked questions about this route
- How far is Seattle from San Francisco by air?
- The great-circle distance between King County International Airport - Boeing Field and San Francisco International Airport is approximately 685 mi.
- How long is the flight from Seattle to San Francisco?
- Based on the distance, the estimated flight time is about 1h 55m. This is an estimate, not a schedule.
- Is there a direct connection from Seattle to San Francisco?
- Yes, a direct connection between BFI and SFO has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Regency Airlines and United Airlines.
- How often is there a flight from Seattle to San Francisco?
- On average around 1 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 302 observed flights. Mainly Regency Airlines, United Airlines. That is an observation, not a timetable.
- What is the current time difference between Seattle and San Francisco?
- Same local time in Seattle and San Francisco.
Where this data comes from
The route data comes from the flight archive (ADS-B, adsb.lol): which connections actually flew over the last twelve full months and who flew them, combined with our own airport, runway, and airline datasets. It is reference data about observed routes - not a current timetable and no claim about bookability.
The frequency and aircraft on this page come from the flight archive (ADS-B, 12 months, October 2025 to September 2026), summarized per route per month. We do not see every flight, so it is a floor, not a count.
Route data updated on October 11, 2026.