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Route

Ontario → Seattle

ONTOntarioOntario International Airport
BFISeattleKing County International Airport - Boeing Field
Distance
962 mi
Estimated flight time
~2h 25m

Same local time in Ontario and Seattle.

Observed nonstop

View the reverse route

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
2 hr 11 min
measured flight time
12 / 12
months seen

Through the year

Per day, month by month

  1. 1Jan2026
  2. 1Feb
  3. 1Mar
  4. 2Apr
  5. 2May
  6. 2Jun
  7. 1Jul
  8. 1Aug
  9. 1Sep
  10. 1Oct2025
  11. 1Nov
  12. 1Dec

Airlines

Who flies it

UPS Airlinesall year

Through the day

Departure times

Local time in Ontario. Most departures between 00:00 and 03:00.

  1. 00:00
  2. 01:00
  3. 02:00
  4. 03:00
  5. 04:00
  6. 05:00
  7. 06:00
  8. 07:00
  9. 08:00
  10. 09:00
  11. 10:00
  12. 11:00
  13. 12:00
  14. 13:00
  15. 14:00
  16. 15:00
  17. 16:00
  18. 17:00
  19. 18:00
  20. 19:00
  21. 20:00
  22. 21:00
  23. 22:00
  24. 23:00

Through the week

By weekday

  1. 0.1Mon
  2. 1.3Tue
  3. 1.6Wed
  4. 1.4Thu
  5. 1Fri
  6. 0.1Sat
  7. 0.1Sun

Fleet

Aircraft observed

  1. Boeing 767-300B76367%
  2. Boeing 757-200B75221%
  3. Cessna Citation CJ3C25B3%
  4. Airbus A300-600A3061%
  5. Cessna Citation CJ4C25C1%
All the numbers in a table
MonthPer daySeenAirlines
January 2026116
  • UPS Airlines13×
February 2026120
  • UPS Airlines16×
March 2026124
  • UPS Airlines20×
April 2026229
  • UPS Airlines29×
May 2026224
  • UPS Airlines22×
June 2026229
  • UPS Airlines27×
July 2026128
  • UPS Airlines24×
August 2026119
  • UPS Airlines16×
September 2026117
  • UPS Airlines17×
October 2025122
  • UPS Airlines19×
November 2025122
  • UPS Airlines18×
December 2025140
  • UPS Airlines36×

Airlines observed on this route

From observed callsign routes on ONT-BFI - not a booking guarantee.

UPS Airlines

5X · UPS

Hub: SDF Louisville

154 departure airportsView airline →

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 Ontario: 63.
  • Direct destinations observed from Seattle: 63.

The airports on this route

Ontario International Airport

Ontario, United StatesONT / KONT

Major airport · 63 direct destinations · 2 runways · longest runway 12,198 ft

86 °F · Partly cloudySource: METAR observation via the NOAA Aviation Weather Center

Airport pageAll direct destinations

King County International Airport - Boeing Field

Seattle, United StatesBFI / KBFI

Regional airport · 63 direct destinations · 2 runways · longest runway 10,007 ft

58 °F · CloudySource: METAR observation via the NOAA Aviation Weather Center

Airport pageAll direct destinations

Alternative airports for this journey

Same journey, a different airport nearby - with an observed direct connection.

ONT SEASeattle–Tacoma International AirportSeattle is about 6 mi from Seattle.View route →SNA BFIJohn Wayne Orange County International AirportSanta Ana is about 30 mi from Ontario.View route →LGB BFILong Beach International AirportLong Beach is about 35 mi from Ontario.View route →BUR BFIHollywood Burbank/Bob Hope AirportBurbank is about 45 mi from Ontario.View route →

About the route from Ontario to Seattle

The observed direct connection between Ontario International Airport (ONT) and King County International Airport - Boeing Field (BFI) covers approximately 962 mi. The estimated flight time is around 2h 25m. UPS Airlines has been observed on this connection in the available route data.

Frequently asked questions about this route

How far is Ontario from Seattle by air?
The great-circle distance between Ontario International Airport and King County International Airport - Boeing Field is approximately 962 mi.
How long is the flight from Ontario to Seattle?
Based on the distance, the estimated flight time is about 2h 25m. This is an estimate, not a schedule.
Is there a direct connection from Ontario to Seattle?
Yes, a direct connection between ONT and BFI has been observed in our route data.
Which airlines have been observed on this route?
In the available route data: UPS Airlines.
How often is there a flight from Ontario to Seattle?
On average around 1 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 290 observed flights. Mainly UPS Airlines. That is an observation, not a timetable.
What is the current time difference between Ontario and Seattle?
Same local time in Ontario 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.