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
Route
San Francisco → Seattle
SFO
San FranciscoSan Francisco International Airport
San FranciscoSan Francisco International AirportSEASeattleSeattle–Tacoma International Airport
SeattleSeattle–Tacoma International Airport- Distance
- 679 mi
- Estimated flight time
- ~1h 50m
Same local time in San Francisco and Seattle.
Observed nonstop
How often does this route fly?
Frequency
Throughout the day
On average around 18 flights a day, observed from October 2025 to September 2026.
- 18
- flights per day
- 21
- busiest month · Jun
- 15
- quietest month · Jan
- 1 hr 38 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 15Jan2026
- 16Feb
- 16Mar
- 16Apr
- 19May
- 21Jun
- 21Jul
- 21Aug
- 20Sep
- 17Oct2025
- 19Nov
- 17Dec
Airlines
Who flies it
Alaska Airlinesall year
United Airlinesall year
Delta Air Linesall year
SkyWest Airlinesall year
Horizon Airnow and then
Southwest Airlinesnow and then
Through the day
Departure times
Local time in San Francisco. Most departures between 17:00 and 20:00.
- 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
- 19.2Mon
- 18.4Tue
- 16.6Wed
- 17.7Thu
- 18.6Fri
- 17Sat
- 17.8Sun
Fleet
Aircraft observed
- Boeing 737-900B73917%
- Boeing 737-800B73815%
- Embraer 175E75L15%
- Boeing 737 MAX 9B39M15%
- Airbus A320A32010%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 15 | 446 |
|
| February 2026 | 16 | 469 |
|
| March 2026 | 16 | 484 |
|
| April 2026 | 16 | 465 |
|
| May 2026 | 19 | 527 |
|
| June 2026 | 21 | 617 |
|
| July 2026 | 21 | 644 |
|
| August 2026 | 21 | 605 |
|
| September 2026 | 20 | 605 |
|
| October 2025 | 17 | 533 |
|
| November 2025 | 19 | 556 |
|
| December 2025 | 17 | 500 |
|
Airlines observed on this route
From observed callsign routes on SFO-SEA - 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: 132.
The airports on this route
Seattle–Tacoma International Airport
Seattle, United StatesSEA / KSEA
International hub · 132 direct destinations · 3 runways · longest runway 11,900 ft
47 °F · FogSource: 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 BFIKing County International Airport - Boeing FieldSeattle is about 6 mi from Seattle.View route →OAK SEAOakland San Francisco Bay AirportOakland is about 11 mi from San Francisco.View route →SJC SEAMineta San Jose International AirportSan Jose is about 30 mi from San Francisco.View route →SFO PAESeattle Paine Field International AirportEverett is about 32 mi from Seattle.View route →
About the route from San Francisco to Seattle
The observed direct connection between San Francisco International Airport (SFO) and Seattle–Tacoma International Airport (SEA) covers approximately 679 mi. The estimated flight time is around 1h 50m. Alaska Airlines, Delta Air Lines, Horizon Air, SkyWest Airlines, Southwest Airlines 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 Seattle–Tacoma International Airport is approximately 679 mi.
- How long is the flight from San Francisco to Seattle?
- Based on the distance, the estimated flight time is about 1h 50m. This is an estimate, not a schedule.
- Is there a direct connection from San Francisco to Seattle?
- Yes, a direct connection between SFO and SEA 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, Horizon Air, SkyWest Airlines, Southwest Airlines and United Airlines.
- How often is there a flight from San Francisco to Seattle?
- On average around 18 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 6,451 observed flights. Mainly Alaska Airlines, United Airlines, Delta Air Lines. 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.