Ontario International Airport
Ontario, United StatesONT / KONT
Major airport · 63 direct destinations · 2 runways · longest runway 12,198 ft
82 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center
Route
Ontario → San Francisco
ONT
OntarioOntario International Airport
OntarioOntario International AirportSFOSan FranciscoSan Francisco International Airport
San FranciscoSan Francisco International Airport- Distance
- 364 mi
- Estimated flight time
- ~1h 15m
Same local time in Ontario and San Francisco.
Observed nonstop
How often does this route fly?
Frequency
Several times a day
On average around 4 flights a day, observed from October 2025 to September 2026.
- 4
- flights per day
- 4
- busiest month · Oct
- 3
- quietest month · Dec
- 58 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 3Jan2026
- 3Feb
- 3Mar
- 4Apr
- 4May
- 4Jun
- 4Jul
- 4Aug
- 4Sep
- 4Oct2025
- 4Nov
- 3Dec
Airlines
Who flies it
United Airlinesall year
Frontier Airlinesall year
SkyWest Airlinesall year
Through the day
Departure times
Local time in Ontario. 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
- 4.1Mon
- 3.8Tue
- 3.1Wed
- 3.3Thu
- 4.1Fri
- 4.2Sat
- 3.7Sun
Fleet
Aircraft observed
- Boeing 737 MAX 9B39M22%
- Airbus A320A32012%
- Airbus A320neoA20N12%
- Boeing 737-800B73812%
- Boeing 737 MAX 8B38M11%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 3 | 97 |
|
| February 2026 | 3 | 83 |
|
| March 2026 | 3 | 101 |
|
| April 2026 | 4 | 119 |
|
| May 2026 | 4 | 119 |
|
| June 2026 | 4 | 118 |
|
| July 2026 | 4 | 120 |
|
| August 2026 | 4 | 130 |
|
| September 2026 | 4 | 136 |
|
| October 2025 | 4 | 120 |
|
| November 2025 | 4 | 105 |
|
| December 2025 | 3 | 97 |
|
Airlines observed on this route
From observed callsign routes on ONT-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 Ontario: 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
66 °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.
ONT OAKOakland San Francisco Bay AirportOakland is about 11 mi from San Francisco.View route →SBD SFOSan Bernardino International AirportSan Bernardino is about 21 mi from Ontario.View route →ONT SJCMineta San Jose International AirportSan Jose is about 30 mi from San Francisco.View route →SNA SFOJohn Wayne Orange County International AirportSanta Ana is about 30 mi from Ontario.View route →
About the route from Ontario to San Francisco
The observed direct connection between Ontario International Airport (ONT) and San Francisco International Airport (SFO) covers approximately 364 mi. The estimated flight time is around 1h 15m. Frontier Airlines, SkyWest Airlines and United Airlines have been observed on this connection in the available route data.
Frequently asked questions about this route
- How far is Ontario from San Francisco by air?
- The great-circle distance between Ontario International Airport and San Francisco International Airport is approximately 364 mi.
- How long is the flight from Ontario to San Francisco?
- Based on the distance, the estimated flight time is about 1h 15m. This is an estimate, not a schedule.
- Is there a direct connection from Ontario to San Francisco?
- Yes, a direct connection between ONT and SFO has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Frontier Airlines, SkyWest Airlines and United Airlines.
- How often is there a flight from Ontario to San Francisco?
- On average around 4 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 1,345 observed flights. Mainly United Airlines, Frontier Airlines, SkyWest Airlines. That is an observation, not a timetable.
- What is the current time difference between Ontario and San Francisco?
- Same local time in Ontario 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.