Flights from San Francisco to Ontario

Our cheapest offers for flights from San Francisco to Ontario

Here you can compare cheap flights from San Francisco (SFO) to Ontario (ONT) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Ontario. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
San Francisco
Ontario
Outbound
11/26/25
direct
F92678
01h 28min
Return
-
Frontier Airlines
$126
San Francisco
Ontario
Outbound
04/03/26
direct
F92678
01h 28min
Return
04/16/26
1 Stopover (PDX)
AS0544, AS1457
06h 21min
Frontier Airlines ?
$346
Best option
San Francisco
Ontario
Outbound
04/03/26
direct
UA0552
01h 36min
Return
04/16/26
direct
UA2363
01h 29min
United Airlines ?
$458
San Francisco
Ontario
Outbound
04/03/26
1 Stopover (PDX)
AS1410, AS0340
12h 13min
Return
04/16/26
1 Stopover (PDX)
AS0544, AS0236
09h 38min
Alaska Airlines ?
$473
San Francisco
Ontario
Outbound
04/03/26
1 Stopover (PHX)
AA1930, AA1782
05h 16min
Return
04/16/26
1 Stopover (PHX)
AA3168, AA2813
05h 08min
American Airlines ?
$596
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from San Francisco to Ontario

Favorite airline: Frontier Airlines
99 % of travelers choose to book flights on this route with Frontier Airlines and United Airlines.
Frontier Airlines
83 %
United Airlines
16 %
Cheapest weekday: Tuesday
The cheapest ticket prices are available for flights departing on Tuesday.
Direct flights are cheaper
Compared to flights with a stopover, direct flights are $341.00 cheaper on this route.
non stop flight
1 stop
01h 23min
05h 55min
$54
$395
The favorite connection is non-stop
Direct flights are especially popular on this route. 99 % of travelers will book a direct flight.
Route
bookings
Direct flights
01h 23min, from $54
99 %
1 stopover Phoenix - Sky Harbor International Airport
05h 55min, from $395
1 %

Important flight information

Flight information: San Francisco - Ontario

Cheapest outbound flight from $125.97
Roundtrip from $345.98
Flight duration min. 01:27 / max. 03:20
Return flight duration min. 01:28/ max. 01:35
Distance 585 km
Flights per week 48
Departure airport Airport San Francisco International Airport, CA (SFO)
Arrival airport Airport Ontario-CA (ONT)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Ontario
Flight destinations with a similar price
Flight destinations with a similar price