Flights from Ontario to San Francisco

Our cheapest offers for flights from Ontario to San Francisco

Here you can compare cheap flights from Ontario (ONT) to San Francisco (SFO) 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 San Francisco. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Ontario
San Francisco
Outbound
10/18/25
1 Stopover (LAS)
F91358, F93801
04h 07min
Return
11/17/25
direct
F92678
01h 29min
Frontier Airlines
$141
Best option
Ontario
San Francisco
Outbound
10/18/25
direct
UA1840
01h 19min
Return
11/17/25
direct
UA5981
01h 35min
United Airlines ?
$191
Ontario
San Francisco
Outbound
10/18/25
1 Stopover (LAS)
F92232, F94401
13h 22min
Return
11/17/25
direct
F92678
01h 29min
Frontier Airlines
$144
Ontario
San Francisco
Outbound
10/18/25
1 Stopover (LAS)
F92232, F94401
13h 22min
Return
11/17/25
direct
F92678
01h 29min
Frontier Airlines
$149
Ontario
San Francisco
Outbound
10/18/25
direct
UA0393
01h 19min
Return
11/17/25
direct
UA0448
01h 35min
United Airlines ?
$200
Ontario
San Francisco
Outbound
10/18/25
1 Stopover (PHX)
AA6508, AA0686
05h 25min
Return
11/17/25
1 Stopover (PHX)
AA2664, AA1423
13h 24min
American Airlines ?
$321
Ontario
San Francisco
Outbound
10/18/25
1 Stopover (PHX)
AA6508, AA0686
05h 25min
Return
11/17/25
1 Stopover (PHX)
AA6404, AA3016
05h 35min
American Airlines ?
$421
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from Ontario to San Francisco

Favorite airline: Frontier Airlines
The favorite airline for flights from Ontario to San Francisco is Frontier Airlines.
Frontier Airlines
90 %
United Airlines
10 %
Cheapest weekday: Tuesday
Compared to other weekdays, flights are cheapest on Tuesday.

Important flight information

Flight information: Ontario - San Francisco

Roundtrip from $140.42
Flight duration min. 01:28 / max. 01:35
Return flight duration min. 01:27/ max. 03:20
Distance 585 km
Flights per week 42
Departure airport Airport Ontario-CA (ONT)
Arrival airport Airport San Francisco International Airport, CA (SFO)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to San Francisco
Flight destinations with a similar price