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Flights from San Francisco to Ontario
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Find San Francisco to Ontario flights starting at US$18.

We've found these cheap flights for you. You can book one-way or return flight tickets.

  • One way
  • Round-trip
      • Cheapest nonstop
        SFO12:19
        1h 28m
        Nonstop
        ONT13:47
        Thu, Jan 30|San Francisco - Ontario|Frontier Airlines
        US$18US$28
        35% OFF
        35% OFF
        US$28US$18

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Thu, Jan 30, arriving at Ontario International Airport. One-way Prices start from US$18 including taxes and charges.

      • SFO21:59
        1h 24m
        Nonstop
        ONT23:23
        Sun, Dec 15|San Francisco - Ontario|Frontier Airlines
        US$18US$28
        34% OFF
        34% OFF
        US$28US$18

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Sun, Dec 15, arriving at Ontario International Airport. One-way Prices start from US$18 including taxes and charges.

      • SFO21:59
        1h 24m
        Nonstop
        ONT23:23
        Mon, Jan 13|San Francisco - Ontario|Frontier Airlines
        US$19US$28
        34% OFF
        34% OFF
        US$28US$19

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Mon, Jan 13, arriving at Ontario International Airport. One-way Prices start from US$19 including taxes and charges.

      • SFO21:59
        1h 24m
        Nonstop
        ONT23:23
        Sun, Dec 8|San Francisco - Ontario|Frontier Airlines
        US$19
        US$19

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Sun, Dec 8, arriving at Ontario International Airport. One-way Prices start from US$19 including taxes and charges.

      • SFO21:59
        1h 24m
        Nonstop
        ONT23:23
        Mon, Dec 16|San Francisco - Ontario|Frontier Airlines
        US$19
        US$19

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Mon, Dec 16, arriving at Ontario International Airport. One-way Prices start from US$19 including taxes and charges.

      • SFO21:59
        1h 24m
        Nonstop
        ONT23:23
        Fri, Jan 10|San Francisco - Ontario|Frontier Airlines
        US$19
        US$19

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Fri, Jan 10, arriving at Ontario International Airport. One-way Prices start from US$19 including taxes and charges.

      • SFO16:32
        1h 28m
        Nonstop
        ONT18:00
        Mon, Dec 9|San Francisco - Ontario|Frontier Airlines
        US$19
        US$19

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Mon, Dec 9, arriving at Ontario International Airport. One-way Prices start from US$19 including taxes and charges.

      • SFO21:59
        1h 24m
        Nonstop
        ONT23:23
        Fri, Dec 6|San Francisco - Ontario|Frontier Airlines
        US$20
        US$20

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Fri, Dec 6, arriving at Ontario International Airport. One-way Prices start from US$20 including taxes and charges.

      • SFO21:59
        1h 25m
        Nonstop
        ONT23:24
        Sun, Feb 2|San Francisco - Ontario|Frontier Airlines
        US$21
        US$21

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Sun, Feb 2, arriving at Ontario International Airport. One-way Prices start from US$21 including taxes and charges.

      • SFO21:59
        1h 25m
        Nonstop
        ONT23:24
        Sun, Jan 12|San Francisco - Ontario|Frontier Airlines
        US$23
        US$23

        Choose Frontier Airlines flights from San Francisco to Ontario. The one-way direct flight with Frontier Airlines departs from San Francisco International Airport on Sun, Jan 12, arriving at Ontario International Airport. One-way Prices start from US$23 including taxes and charges.

      • SFO13:00
        3h 5m
        Nonstop
        ONT14:00
        Sun, Dec 1|San Francisco - Ontario|Frontier Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

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

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Find Cheapest Airlines Flying from San Francisco to Ontario

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines
From US$18
Alaska Airlines
From US$78
Southwest Airlines
From US$88
United Airlines
From US$90
Delta Air Lines
From US$93
American Airlines
From US$93
Hawaiian Airlines
From US$236

Find more flights and airlines

Alternative Routes for San Francisco to Ontario Flights

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from San Francisco to Ontario.

  • Cheapest
    Frontier Airlines
    SFO
    12:19
    1h 28m
    Nonstop
    ONT
    13:47
    San Francisco International Airport - Ontario International Airport
    Thu, Jan 30Frontier Airlines
    US$18
  • Frontier Airlines
    SFO
    12:19
    1h 28m
    Nonstop
    ONT
    13:47
    San Francisco International Airport - Ontario International Airport
    Thu, Jan 30Frontier Airlines
    US$18
    Find More Flights

FAQ

  • When are flight tickets from San Francisco (SFO) to Ontario (ONT) the cheapest?

    Airlines adjust prices for flights from San Francisco to Ontario based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much are flights from San Francisco (SFO) to Ontario (ONT) cost?

    According to Trip.com's data, the lowest price is around US$136.

  • What's the most popular airline for direct flights from San Francisco (SFO) to Ontario (ONT)?

    Jetblue Airways operates 1 direct flights from San Francisco (SFO) to Ontario (ONT).

How to find a cheap flight from San Francisco to Ontario

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from San Francisco to Ontario. Book your flights at the right time and save more.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Information for San Francisco to Ontario Flights

Cheapest direct flight priceUS$18
Cheapest return ticket priceUS$35
Off-season travel monthFebruary
Peak season for travelFebruary
Flight distance12,799.42km
Popular airlineUnited Airlines

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