Cheap flights from Ontario to San Francisco

Flights overview

Useful information for finding cheap flights from Ontario to San Francisco and booking your next trip
Cheapest round-trip flights $83
Frontier Nonstop 2 hr Sat, Jun 6 — Mon, Jun 8
The cheapest round-trip flight from Ontario to San Francisco is currently $83
Cheapest one-way flight $28
Frontier Nonstop 2 hr Wed, Jun 3
The cheapest one-way flight from Ontario to San Francisco is currently $28
Last-minute weekend getaway $195
Frontier 1 stop 19 hr Sat, May 9 — Sun, May 10
The cheapest last-minute weekend getaway from Ontario to San Francisco is currently $195
Cheapest business class flights $291
Frontier Nonstop 2 hr Sat, Jun 6 — Mon, Jun 8
The cheapest business class round-trip flight from Ontario to San Francisco is currently $291
Fastest flight 1 hr 23 min The fastest nonstop flight from Ontario to San Francisco takes 1 hr 23 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 Ontario to San Francisco is typically June. The most expensive month to fly is typically February.
June
Cheapest
Typical prices: $55–160
February
Most expensive
Typical prices: $170–265

Popular airlines from Ontario to San Francisco

  • United
    Nonstop
    from $177
    Typical price: $130–350
    26 weekly nonstop flights
    ONT - SFO Every day
    119 weekly connecting flights
    ONT - SFO Every day
  • Southwest
    from $219
    Typical price: $195–380
    796 weekly connecting flights
    ONT - SFO Every day
  • Frontier
    Nonstop
    from $83
    Typical price: $105–265
    3 weekly nonstop flights
    ONT - SFO Every Thu, Fri, Sun
    34 weekly connecting flights
    ONT - SFO Every day
  • American
    from $370
    Typical price: $230–520
    169 weekly connecting flights
    ONT - SFO Every day
  • Alaska
    from $428
    Typical price: $335–740
    135 weekly connecting flights
    ONT - SFO Every day
  • Delta
    from $1,363
    Typical price: $1,250–1,800
    71 weekly connecting flights
    ONT - SFO Every day

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

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

Frequently asked questions about flying from Ontario to San Francisco

The cheapest flights from Ontario to San Francisco are usually in June. Typical ticket prices in June range from $55 to $160.
The cheapest round-trip flight from Ontario to San Francisco recently found on Google Flights was with Frontier from $83. 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 Ontario to San Francisco is $177, flying from May 28 to Jun 1.
  • The cheapest Southwest flight from Ontario to San Francisco is $219, flying from Jun 4 to Jun 8.
  • The cheapest Frontier flight from Ontario to San Francisco is $83, flying from Jun 6 to Jun 8.
  • The cheapest American flight from Ontario to San Francisco is $370, flying from May 29 to Jun 1.
  • The cheapest Alaska flight from Ontario to San Francisco is $428, flying from May 30 to Jun 1.
  • The cheapest Delta flight from Ontario to San Francisco is $1,363, flying from Jul 4 to Jul 6.
The cheapest round-trip flight from Ontario to San Francisco starts at $83 from Sat, Jun 6 to Mon, Jun 8. The cheapest one-way flight starts at $28 and departs on Wed, Jun 3.
1 hr 23 min is the shortest flight time from Ontario to San Francisco.
Apr–Dec is when most people visit San Francisco, with crowds peaking in summer. Although average temperatures are higher then, mornings and evenings often have damp, chilly fog. In summer, street fairs and cultural institutions offer free outdoor entertainment. Winter visitors will find the opera and ballet seasons in full swing. Major annual events include Chinese New Year (Feb), Bay to Breakers footrace (May), San Francisco Pride parade and festival (Jun), and San Francisco Fleet Week (Oct).
It's easy to use Google Flights to find the cheapest days to fly from Ontario to San Francisco.
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 Ontario to San Francisco 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 Ontario to San Francisco.

In terms of nonstop flights, United is the most popular. United offers 26 nonstop flights and 119 connecting flights per week. United flies from Ontario International Airport (ONT) to San Francisco International Airport (SFO) .

In terms of flights, Southwest is the most popular. Southwest offers 796 connecting flights per week. Southwest flies from Ontario International Airport (ONT) to San Francisco International Airport (SFO) .

Other popular airlines flying from Ontario to San Francisco are:
  • Frontier offers 3 nonstop flights and 34 connecting flights per week. Frontier flies from Ontario International Airport (ONT) to San Francisco International Airport (SFO) .
  • American offers 169 connecting flights per week. American flies from Ontario International Airport (ONT) to San Francisco International Airport (SFO) .
  • Alaska offers 135 connecting flights per week. Alaska flies from Ontario International Airport (ONT) to San Francisco International Airport (SFO) .
  • Delta offers 71 connecting flights per week. Delta flies from Ontario International Airport (ONT) to San Francisco International Airport (SFO) .
The number of connecting flights refers to distinct flights with at least one stop between Ontario and San Francisco.
The cheapest round-trip flight from Ontario to San Francisco recently found on Google Flights was with Frontier from $83. 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 Ontario to San Francisco is $177, flying from May 28 to Jun 1.
  • The cheapest Southwest flight from Ontario to San Francisco is $219, flying from Jun 4 to Jun 8.
  • The cheapest Frontier flight from Ontario to San Francisco is $83, flying from Jun 6 to Jun 8.
  • The cheapest American flight from Ontario to San Francisco is $370, flying from May 29 to Jun 1.
  • The cheapest Alaska flight from Ontario to San Francisco is $428, flying from May 30 to Jun 1.
  • The cheapest Delta flight from Ontario to San Francisco is $1,363, flying from Jul 4 to Jul 6.
United and Frontier fly direct from Ontario to San Francisco.
  • There are 26 United direct flights from Ontario to San Francisco per week. Flights are available every day.
  • There are 3 Frontier direct flights from Ontario to San Francisco per week. Flights are available on 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 Ontario and San Francisco at price $195 is offered by Frontier from Sat, May 9 to Sun, May 10.
United and Frontier fly direct from Ontario to San Francisco.
  • There are 26 United direct flights from Ontario to San Francisco per week. Flights are available every day.
  • There are 3 Frontier direct flights from Ontario to San Francisco per week. Flights are available on 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 Ontario to San Francisco on a daily basis.
The cheapest direct (nonstop) round-trip flights between Ontario and San Francisco start at $83 from Sat, Jun 6 to Mon, Jun 8 with Frontier.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Ontario to San Francisco, 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 Ontario and San Francisco start at $291 from Sat, Jun 6 to Mon, Jun 8 with Frontier.
The cheapest economy class round-trip flights between Ontario and San Francisco start at $83 from Sat, Jun 6 to Mon, Jun 8.
To book business class trips from Ontario to San Francisco, 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 Ontario and San Francisco starts at $195 from Sat, May 9 to Sun, May 10 with Frontier.
The cheapest last-minute deal between Ontario and San Francisco at price $195 is offered by Frontier from Sat, May 9 to Sun, May 10.
To find last-minute flight deals from Ontario to San Francisco, 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.

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Popular trips from Ontario

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