Cheap flights from San Francisco to Ontario from $39
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Ontario departing on 5/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Frontier flights from San Francisco to Ontario
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How to get the cheapest flight ticket from San Francisco to Ontario
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Ontario?
In general, May is the cheapest month to fly from San Francisco to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $90. If you aren’t able to travel during the month of May, then book flights to Ontario from San Francisco during July instead. Flights to Ontario in July, while not as cheap as those in May, still average around $92.
What is the cheapest day to depart on your flight to Ontario?
The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $103. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from San Francisco to Ontario for around $127.
What is the cheapest time of day to depart on your flight to Ontario?
At noon is the cheapest time of day to fly from San Francisco to Ontario when you can find flight prices for as low as $100. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $161 on average. Flights to Ontario from San Francisco in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.
What is the cheapest San Francisco to Ontario flight route?
Fly from San Francisco to Ontario for the best San Francisco - Ontario flight prices
How far in advance should I book a flight to Ontario?
You are more likely to see cheaper flights to Ontario from San Francisco when booking 25 weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $124 when searching 25 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from San Francisco for as low as $81 on momondo.
What cabin class options are available on San Francisco to Ontario flights?
There are 4 cabin classes available to choose from on San Francisco to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from San Francisco to Ontario?
Frontier, United Airlines, and Southwest are the most popular carriers operating from San Francisco to Ontario
What airlines fly to Ontario?
Frontier, Alaska Airlines and Spirit Airlines are the top three most popular airlines that fly to Ontario from San Francisco according to our data. Frontier is the first choice among our users, with 34% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 12 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.
How many flights depart from San Francisco to Ontario on average per day?
The number of flights available between San Francisco and Ontario is 6 per day as of March 2025. The most frequent departure time is 4:00PM, with 41% of daily flights leaving in the afternoon.
How many flights depart from San Francisco to Ontario on average per week?
As of March 2025, there are 44 flights per week flying from San Francisco to Ontario. The most common day of the week flights depart is Fri, with 20% of flights taking off on this day.
When to book flights from San Francisco to Ontario
Cheap San Francisco to Ontario (SFO to ONT) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from San Francisco to Ontario
How far is San Francisco to Ontario by plane?
There are 370.2 mi between San Francisco and Ontario. By plane, this route typically takes 1h 25m.
When did momondo last update prices for flights from San Francisco Airport to Ontario Airport?
Prices for flights from San Francisco Airport to Ontario Airport were last updated today.
How many operators does momondo search for flights from San Francisco Airport to Ontario Airport?
There are 6 operators available for flights from San Francisco Airport to Ontario Airport as of March 2025.
How old do you have to be to fly from San Francisco Airport to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from San Francisco to Ontario?
Based on momondo bookings for flights between San Francisco and Ontario, the leading plane model is Airbus A320neo, making up 24.68% of the total bookings. Other popular models include Embraer 175 (Enhanced Winglets) with 10.91%, Airbus A320-100/200 with 9.90%, and Airbus A321neo with 7.35%.
What is the most popular airline from San Francisco to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from San Francisco to Ontario is Frontier (68% of total bookings). The next most popular airlines are United Airlines (29%), Delta (1%), and Spirit Airlines (1%).
Best airlines flying from San Francisco to Ontario
Compare and see reviews for airlines that fly from San Francisco to Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $32 | Free Cancellation | Rating 6.3 7,876 reviews | |||
| PriceFrom $38 | Free Cancellation | Rating 5.9 3,273 reviews | |||
| PriceFrom $45 | Free Cancellation | Rating 8.0 7,888 reviews | |||
| PriceFrom $59 | Free Cancellation | Rating 8.0 9,785 reviews | |||
| PriceFrom $78 | Free Cancellation | Rating 8.0 156 reviews | |||
| PriceFrom $93 | Free Cancellation | Rating 7.4 8,603 reviews |
United Airlines Flights From San Francisco to Ontario
The lowest priced United Airlines flight from San Francisco to Ontario from the last 72 hours was $93. Generally, United Airlines has 17 flights on this route every week with an average price of $243. United Airlines is rated 7.4/10 by our users.
Frontier Flights From San Francisco to Ontario
$38 is the best Frontier flight deal from San Francisco to Ontario found on momondo over the last 72 hours. The average Frontier ticket price found was closer to $90, however, with flight time and availability significantly affecting the price. Frontier (6.0/10 from 3,273 user reviews) flies into Ontario from San Francisco 2 times in an average week so prices can vary.
Why use momondo?
Why should I use momondo to find a flight deal from San Francisco to Ontario?
It is quick and easy to find San Francisco to Ontario flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ontario that suits you.
Can I find flights from San Francisco to Ontario with flexible booking policies on momondo?
Yes. All flights to Ontario from San Francisco on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from San Francisco to Ontario?
Once all potential San Francisco to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from San Francisco to Ontario right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of San Francisco to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.