Cheap Flights from Ontario to San Francisco

Cheapest flights from Ontario to San Francisco

Flaut.Travel was designed and developed by a team dedicated to making the process of searching, comparing and booking airline tickets as easy and convenient as possible. Our service helps travelers to find and buy the cheapest flights from Ontario to San Francisco. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.

Cheapest one way flight

$30

Frontier Airlines

Direct flight

1h 38m

01/07/2026

The cheapest one-way flight from Ontario to San Francisco departs on 01/07/2026, is operated by Frontier Airlines and costs $30

Cheapest round trip flight

$86

Frontier Airlines

Direct flight

3h 8m

12/05/2025

The cheapest roundtrip flight from Ontario to San Francisco departs on 12/05/2025, is operated by Frontier Airlines and costs $86

The fastest flight

1h 10m

Fastest flight from Ontario to San Francisco takes 1h 10m

Direct flights

Several times a week

There are direct flights on this route 6 days a week: Su, Mo, Tu, We, Th, and Sa

Earliest flight

6:00 AM

Latest flight

10:50 PM

Direct flights count

28

Distance

597km

Timezone difference

0h

The distance between Ontario and San Francisco is 597km (370 miles). There are 28 direct flights from Ontario to San Francisco. Ontario and San Francisco are in the same time zone. Flights from Ontario begin at 6:00 AM. The latest flight from Ontario departs at 10:50 PM

Remember that on average the ideal time to book flights is 2 months before departure!

Airfare from Ontario to San Francisco by month

The minimum one-way ticket price from Ontario to San Francisco is $54 (November 2025), while the maximum is $83 (January 2026). On average, a ticket costs $67–$147.

November 2025

Lowest price

on average:

$54

January 2026

Highest price

on average:

$83

Avg Price

Airlines operating on route

The Ontario — San Francisco route is served by a wide range of airlines: 4 in total, including Frontier Airlines, Alaska Airlines, United Airlines, and Southwest Airlines. Competition among carriers gives passengers the opportunity to find tickets at attractive fares — with prices starting from $30. Our service helps compare all available offers within seconds and choose the most convenient option. You can filter flights by price, departure time, or baggage rules to make your trip as comfortable as possible. With so many airlines, there’s always a chance to catch special promotions and save.

Starting at $30

Starting at $66

Starting at $88

Starting at $94

Direct Flights from Ontario to San Francisco

A direct flight is the most convenient and comfortable way to fly from Ontario to San Francisco, despite the fact that sometimes flights with transfers can cost significantly less.

Los Angeles — San Francisco

LAX — SFO

01/07/2026

Departure

Direct flight

F92857

Starting at $30

Los Angeles — San Francisco

LAX — SFO

12/10/2025

Departure

Direct flight

F92857

Starting at $32

Ontario — San Francisco

ONT — SFO

12/09/2025

Departure

Direct flight

F92677

Starting at $32

Ontario — San Francisco

ONT — SFO

12/06/2025

Departure

Direct flight

F92677

Starting at $36

Los Angeles — San Francisco

LAX — SFO

12/16/2025

Departure

Direct flight

F92857

Starting at $38

Los Angeles — San Francisco

LAX — SFO

12/03/2025

Departure

Direct flight

F92857

Starting at $41

Los Angeles — San Francisco

LAX — SFO

08/25/2026

Departure

Direct flight

AS1417

Starting at $66

Los Angeles — San Francisco

LAX — SFO

07/04/2026

Departure

Direct flight

AS1434

Starting at $67

Ontario — San Francisco

ONT — SFO

12/29/2025

Departure

Direct flight

F92677

Starting at $70

Los Angeles — San Francisco

LAX — SFO

12/22/2025

Departure

Direct flight

F92857

Starting at $72

Schedule of direct flights from Ontario to San Francisco

A direct flight is the easiest way to get to your destination. The following airlines operate non-stop flights from Ontario to San Francisco:

Unable to find information about the schedule of direct flights from

Ontario airports overview

Ontario International Airport

•

ONT

5km

Serves Ontario and the Inland Empire region of Southern California, offering domestic and select international flights; convenient for travelers to Los Angeles, San Bernardino and nearby business centers.

•

San Francisco airports overview

San Francisco International Airport

•

SFO

18km

•

Frequently asked questions (FAQ)

Answers to questions about the route that travelers are most interested in.

How much is the cheapest flight ticket from Ontario to San Francisco?

The cheapest flight ticket from Ontario to San Francisco according to data for the last 48 hours costs $30

When is the best time to buy air tickets on the route Ontario — San Francisco?

Often the best time to buy tickets from Ontario to San Francisco is 2 months before departure.

When is the cheapest time of year to fly from Ontario to San Francisco?

Based on statistics over the past years, the lowest prices for flights from Ontario to San Francisco can be found flying in these months: November, December, January.

How long does it take to fly from Ontario to San Francisco?

The fastest flights from Ontario to San Francisco start from 1 hour 10 minutes in the air.

Which airline can fly direct from Ontario to San Francisco?

The following airlines operate direct flights on the route Ontario — San Francisco: Frontier Airlines, Alaska Airlines

Special offers and sales on air tickets from Ontario to San Francisco

We keep tight track on airlines' pre-holidays sales and other special offers occurences all the time to let you save maximum amount of funds while traveling to your family or just going out on vacation.

We couldn't find any special offers for flights from Ontario to San Francisco

Alternative routes

Bakersfield ➜ San Francisco•Fresno ➜ San Francisco•Long Beach ➜ San Francisco•Merced ➜ San Francisco•Modesto ➜ San Francisco•Mexicali ➜ San Francisco•Santa Barbara ➜ San Francisco•Santa Maria ➜ San Francisco•Tijuana ➜ San Francisco•Yuma ➜ San Francisco•Ontario ➜ Concord•Ontario ➜ Berkeley•Ontario ➜ Modesto•Ontario ➜ Sacramento•Ontario ➜ Stockton•Ontario ➜ San Jose•Ontario ➜ Santa Rosa

•••••••••••••••••••

Cheapest one way flight

$30

Frontier Airlines

Direct flight

1h 38m

01/07/2026

The cheapest one-way flight from Ontario to San Francisco departs on 01/07/2026, is operated by Frontier Airlines and costs $30

Cheapest round trip flight

$86

Frontier Airlines

Direct flight

3h 8m

12/05/2025

The cheapest roundtrip flight from Ontario to San Francisco departs on 12/05/2025, is operated by Frontier Airlines and costs $86

The fastest flight