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
Route
Seattle → Salt Lake City
BFI
SeattleKing County International Airport - Boeing Field
SeattleKing County International Airport - Boeing FieldSLCSalt Lake CitySalt Lake City International Airport
Salt Lake CitySalt Lake City International Airport- Distance
- 690 mi
- Estimated flight time
- ~1h 55m
Salt Lake City is currently 1 hour ahead of 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 · Aug
- 1
- quietest month · Oct
- 1 hr 35 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 1Jan2026
- 1.5Feb
- 1Mar
- 1Apr
- 1May
- 1Jun
- 1.5Jul
- 2Aug
- 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
Alpine Air Expressnow and then
Air Wisconsinnow and then
UPS Airlinesnow and then
Caribairspring
Delta Air Linesnow and then
Sun Country Airlinesnow and then
Through the day
Departure times
Local time in Seattle. Most departures between 11:00 and 14:00.
- 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
- 0.5Mon
- 0.7Tue
- 0.8Wed
- 0.7Thu
- 0.5Fri
- 0.7Sat
- 0.6Sun
Fleet
Aircraft observed
- Cessna Citation LongitudeC70010%
- Bombardier Challenger 350CL357%
- B1905%
- Bombardier CRJ200CRJ23%
- Embraer Phenom 300E55P3%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 1 | 19 |
|
| February 2026 | 1.5 | 23 |
|
| March 2026 | 1 | 19 |
|
| April 2026 | 1 | 18 |
|
| May 2026 | 1 | 7 |
|
| June 2026 | 1 | 21 |
|
| July 2026 | 1.5 | 26 |
|
| August 2026 | 2 | 29 |
|
| September 2026 | 1 | 24 |
|
| October 2025 | 1 | 12 | – |
| November 2025 | 1 | 15 |
|
| December 2025 | 1 | 18 |
|
Airlines observed on this route
From observed callsign routes on BFI-SLC - 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 Salt Lake City: 114.
The airports on this route
Salt Lake City International Airport
Salt Lake City, United StatesSLC / KSLC
International hub · 114 direct destinations · 3 runways · longest runway 12,001 ft
58 °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 SLCSeattle–Tacoma International AirportSeattle is about 6 mi from Seattle.View route →TIW SLCTacoma Narrows AirportTacoma is about 22 mi from Seattle.View route →PAE SLCSeattle Paine Field International AirportEverett is about 26 mi from Seattle.View route →BFI PVUProvo Municipal AirportProvo is about 42 mi from Salt Lake City.View route →
About the route from Seattle to Salt Lake City
The observed direct connection between King County International Airport - Boeing Field (BFI) and Salt Lake City International Airport (SLC) covers approximately 690 mi. The estimated flight time is around 1h 55m. Air Wisconsin, Alpine Air Express, Caribair, Delta Air Lines, Sun Country Airlines and UPS Airlines have been observed on this connection in the available route data.
Frequently asked questions about this route
- How far is Seattle from Salt Lake City by air?
- The great-circle distance between King County International Airport - Boeing Field and Salt Lake City International Airport is approximately 690 mi.
- How long is the flight from Seattle to Salt Lake City?
- 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 Salt Lake City?
- Yes, a direct connection between BFI and SLC has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Air Wisconsin, Alpine Air Express, Caribair, Delta Air Lines, Sun Country Airlines and UPS Airlines.
- How often is there a flight from Seattle to Salt Lake City?
- On average around 1 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 231 observed flights. Mainly Alpine Air Express, Air Wisconsin, UPS Airlines. That is an observation, not a timetable.
- What is the current time difference between Seattle and Salt Lake City?
- Salt Lake City is currently 1 hour ahead of 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.