Find Cheap Flights from San Francisco to Ontario (SFO - LAX)

Flights overview

Useful information for finding cheap flights from San Francisco to Ontario and booking your next trip

Cheapest round-trip flights	$108	Frontier Nonstop 2 hr Thu, Jun 25 — Sun, Jun 28	The cheapest round-trip flight from San Francisco to Ontario is currently $108
Cheapest one-way flight	$28	Frontier Nonstop 2 hr Tue, Jun 30	The cheapest one-way flight from San Francisco to Ontario is currently $28
Last-minute weekend getaway	$256	Frontier 1 stop 29 hr Thu, May 7 — Mon, May 11	The cheapest last-minute weekend getaway from San Francisco to Ontario is currently $256
Cheapest business class flights	$336	Frontier Nonstop 2 hr Thu, Jun 25 — Sun, Jun 28	The cheapest business class round-trip flight from San Francisco to Ontario is currently $336

Fastest flight	1 hr 29 min	The fastest nonstop flight from San Francisco to Ontario takes 1 hr 29 min
Nonstop flights	Every day	There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from San Francisco to Ontario is typically June. The most expensive month to fly is typically February.

June Cheapest	Typical prices: $65–185
February Most expensive	Typical prices: $165–300

Popular airlines from San Francisco to Ontario

United

Nonstop

from $199

Typical price: $135–370

26 weekly nonstop flights

SFO - ONT Every day

110 weekly connecting flights

SFO - ONT Every day
Southwest

from $197

Typical price: $195–390

743 weekly connecting flights

SFO - ONT Every day
Frontier

Nonstop

from $108

Typical price: $105–270

4 weekly nonstop flights

SFO - ONT Every Mon, Thu, Fri, Sun

31 weekly connecting flights

SFO - ONT Every day
American

from $399

Typical price: $235–560

207 weekly connecting flights

SFO - ONT Every day
Alaska

from $418

Typical price: $330–740

134 weekly connecting flights

SFO - ONT Every day
Delta

from $1,314

Typical price: $1,250–1,800

91 weekly connecting flights

SFO - ONT Every day

Popular airports near San Francisco

San Francisco International Airport (SFO)

San Francisco United States 19 min 11 mi
Oakland San Francisco Bay Airport (OAK)

Oakland United States 27 min 11 mi
Sacramento International Airport (SMF)

Sacramento United States 1 hr 34 min 78 mi
San Jose Mineta International Airport (SJC)

San Jose United States 51 min 39 mi

Popular airports near Ontario

Ontario International Airport (ONT)

Ontario United States 11 min 2 mi
Los Angeles International Airport (LAX)

Los Angeles United States 1 hr 7 min 44 mi
Tijuana International Airport (TIJ)

Tijuana Mexico 2 hr 16 min 112 mi
San Diego International Airport (SAN)

San Diego United States 1 hr 50 min 95 mi

Frequently asked questions about flying from San Francisco to Ontario

The cheapest flights from San Francisco to Ontario are usually in June. Typical ticket prices in June range from $65 to $185.

The cheapest round-trip flight from San Francisco to Ontario recently found on Google Flights was with Frontier from $108. The cheapest one-way flight was with Frontier from $28.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest United flight from San Francisco to Ontario is $199, flying from May 28 to Jun 1.
The cheapest Southwest flight from San Francisco to Ontario is $197, flying from Jun 4 to Jun 8.
The cheapest Frontier flight from San Francisco to Ontario is $108, flying from Jun 25 to Jun 28.
The cheapest American flight from San Francisco to Ontario is $399, flying from Jul 25 to Jul 27.
The cheapest Alaska flight from San Francisco to Ontario is $418, flying from May 28 to Jun 1.
The cheapest Delta flight from San Francisco to Ontario is $1,314, flying from Jul 4 to Jul 6.

The cheapest round-trip flight from San Francisco to Ontario starts at $108 from Thu, Jun 25 to Sun, Jun 28. The cheapest one-way flight starts at $28 and departs on Tue, Jun 30.

1 hr 29 min is the shortest flight time from San Francisco to Ontario.

Ontario is a year-round destination, with mild to warm weather for much of the year. Summers (Jun–Aug) tend to be hot, while winters (Dec–Feb) are typically mild. There is a slightly higher chance of rain Jan–Apr. The Road to California (Jan) is a quilt show featuring quilting competitions, classes and exhibits. The city celebrates Independence Day (Jul 4) with a parade, picnic and fireworks display. The Route 66 Cruisin' Reunion (Sep) attracts vintage cars from around the country.

It's easy to use Google Flights to find the cheapest days to fly from San Francisco to Ontario.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.

What counts as the best airline for your flights from San Francisco to Ontario really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from San Francisco to Ontario.

In terms of nonstop flights, United is the most popular. United offers 26 nonstop flights and 110 connecting flights per week. United flies from San Francisco International Airport (SFO) to Ontario International Airport (ONT) .

In terms of flights, Southwest is the most popular. Southwest offers 743 connecting flights per week. Southwest flies from San Francisco International Airport (SFO) to Ontario International Airport (ONT) .

Other popular airlines flying from San Francisco to Ontario are:

Frontier offers 4 nonstop flights and 31 connecting flights per week. Frontier flies from San Francisco International Airport (SFO) to Ontario International Airport (ONT) .
American offers 207 connecting flights per week. American flies from San Francisco International Airport (SFO) to Ontario International Airport (ONT) .
Alaska offers 134 connecting flights per week. Alaska flies from San Francisco International Airport (SFO) to Ontario International Airport (ONT) .
Delta offers 91 connecting flights per week. Delta flies from San Francisco International Airport (SFO) to Ontario International Airport (ONT) .

The number of connecting flights refers to distinct flights with at least one stop between San Francisco and Ontario.

The cheapest round-trip flight from San Francisco to Ontario recently found on Google Flights was with Frontier from $108. The cheapest one-way flight was with Frontier from $28.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest United flight from San Francisco to Ontario is $199, flying from May 28 to Jun 1.
The cheapest Southwest flight from San Francisco to Ontario is $197, flying from Jun 4 to Jun 8.
The cheapest Frontier flight from San Francisco to Ontario is $108, flying from Jun 25 to Jun 28.
The cheapest American flight from San Francisco to Ontario is $399, flying from Jul 25 to Jul 27.
The cheapest Alaska flight from San Francisco to Ontario is $418, flying from May 28 to Jun 1.
The cheapest Delta flight from San Francisco to Ontario is $1,314, flying from Jul 4 to Jul 6.

United and Frontier fly direct from San Francisco to Ontario.

There are 26 United direct flights from San Francisco to Ontario per week. Flights are available every day.
There are 4 Frontier direct flights from San Francisco to Ontario per week. Flights are available on Monday, Thursday, Friday and Sunday.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

The cheapest last-minute deal between San Francisco and Ontario at price $256 is offered by Frontier from Thu, May 7 to Mon, May 11.

United and Frontier fly direct from San Francisco to Ontario.

There are 26 United direct flights from San Francisco to Ontario per week. Flights are available every day.
There are 4 Frontier direct flights from San Francisco to Ontario per week. Flights are available on Monday, Thursday, Friday and Sunday.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

There are direct flights from San Francisco to Ontario on a daily basis.

The cheapest direct (nonstop) round-trip flights between San Francisco and Ontario start at $108 from Thu, Jun 25 to Sun, Jun 28 with Frontier.

It's easy to find nonstop flights with Google Flights! Once you've searched for flights from San Francisco to Ontario, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.

The cheapest business class round-trip flights between San Francisco and Ontario start at $336 from Thu, Jun 25 to Sun, Jun 28 with Frontier.

The cheapest economy class round-trip flights between San Francisco and Ontario start at $108 from Thu, Jun 25 to Sun, Jun 28.

To book business class trips from San Francisco to Ontario, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.

The best last-minute getaway deal for the next weekend between San Francisco and Ontario starts at $256 from Thu, May 7 to Mon, May 11 with Frontier.

The cheapest last-minute deal between San Francisco and Ontario at price $256 is offered by Frontier from Thu, May 7 to Mon, May 11.

To find last-minute flight deals from San Francisco to Ontario, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.