San Francisco International Airport
San Francisco, United StatesSFO / KSFO
International hub · 130 direct destinations · 4 runways · longest runway 11,870 ft
72 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center
Route
San Francisco → Seattle
SFO
San FranciscoSan Francisco International Airport
San FranciscoSan Francisco International AirportBFISeattleKing County International Airport - Boeing Field
SeattleKing County International Airport - Boeing Field- Distance
- 685 mi
- Estimated flight time
- ~1h 55m
Same local time in San Francisco and Seattle.
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 · Sep
- 1
- quietest month · Oct
- 1 hr 37 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 1Jan2026
- 1Feb
- 1Mar
- 1Apr
- 1May
- 1Jun
- 1Jul
- 1Aug
- 2Sep
- 1Oct2025
- 1Nov
- 1Dec
Airlines
Who flies it
Alaska Airlinesnow and then
Delta Air Linesspring
United Airlinesnow and then
Red Barn Operationsnow and then
Through the day
Departure times
Local time in San Francisco. Most departures between 13:00 and 16:00.
- 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
- 0.9Mon
- 1.1Tue
- 1.2Wed
- 1Thu
- 0.7Fri
- 0.6Sat
- 0.7Sun
Fleet
Aircraft observed
- Cessna Citation LatitudeC68A16%
- Cessna Citation LongitudeC70013%
- Bombardier Challenger 350CL359%
- Embraer Phenom 300E55P8%
- Bombardier Challenger 600CL603%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 1 | 27 |
|
| February 2026 | 1 | 30 |
|
| March 2026 | 1 | 39 | – |
| April 2026 | 1 | 26 |
|
| May 2026 | 1 | 18 |
|
| June 2026 | 1 | 30 | – |
| July 2026 | 1 | 19 |
|
| August 2026 | 1 | 25 |
|
| September 2026 | 2 | 28 |
|
| October 2025 | 1 | 31 |
|
| November 2025 | 1 | 34 |
|
| December 2025 | 1 | 15 | – |
Airlines observed on this route
From observed callsign routes on SFO-BFI - 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 San Francisco: 130.
- Direct destinations observed from Seattle: 63.
The airports on this route
King County International Airport - Boeing Field
Seattle, United StatesBFI / KBFI
Regional airport · 63 direct destinations · 2 runways · longest runway 10,007 ft
52 °F · Partly cloudySource: METAR observation via the NOAA Aviation Weather Center
Alternative airports for this journey
Same journey, a different airport nearby - with an observed direct connection.
SFO SEASeattle–Tacoma International AirportSeattle is about 6 mi from Seattle.View route →OAK BFIOakland San Francisco Bay AirportOakland is about 11 mi from San Francisco.View route →SFO PAESeattle Paine Field International AirportEverett is about 26 mi from Seattle.View route →SJC BFIMineta San Jose International AirportSan Jose is about 30 mi from San Francisco.View route →
About the route from San Francisco to Seattle
The observed direct connection between San Francisco International Airport (SFO) and King County International Airport - Boeing Field (BFI) covers approximately 685 mi. The estimated flight time is around 1h 55m. Alaska Airlines, Delta Air Lines, Red Barn Operations and United Airlines have been observed on this connection in the available route data.
Frequently asked questions about this route
- How far is San Francisco from Seattle by air?
- The great-circle distance between San Francisco International Airport and King County International Airport - Boeing Field is approximately 685 mi.
- How long is the flight from San Francisco to Seattle?
- 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 San Francisco to Seattle?
- Yes, a direct connection between SFO and BFI has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Alaska Airlines, Delta Air Lines, Red Barn Operations and United Airlines.
- How often is there a flight from San Francisco to Seattle?
- On average around 1 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 322 observed flights. Mainly Alaska Airlines, Delta Air Lines, United Airlines. That is an observation, not a timetable.
- What is the current time difference between San Francisco and Seattle?
- Same local time in San Francisco and Seattle.
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.