Cheap flights from Ontario to San Francisco from $29
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Francisco departing on 8/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Ontario to San Francisco
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Frontier flights from Ontario to San Francisco
Our best Frontier deals on Ontario to San Francisco flight tickets
United Airlines flights from Ontario to San Francisco
Our best United Airlines deals on Ontario to San Francisco flight tickets
See travel insights to San Francisco from
How to get the cheapest flight ticket from Ontario to San Francisco
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 San Francisco?
If you aren’t able to travel to San Francisco during the month of May, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $90.
What is the cheapest day to depart on your flight to San Francisco?
The cheapest day to depart from Ontario to San Francisco is on a Friday when prices can be found for as low as $178. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $328.
What is the cheapest time of day to depart on your flight to San Francisco?
Our data shows that the cheapest Ontario to San Francisco flights are usually those with departure times in the afternoon. Our users have found flights to San Francisco in the afternoon for as low as $160. Flights in the evening are often more expensive with an average ticket price of $557.
What is the cheapest Ontario to San Francisco flight route?
Fly from Ontario to San Francisco for the best Ontario - San Francisco flight prices
How far in advance should I book a flight to San Francisco?
You are more likely to see cheaper flights to San Francisco from Ontario when booking 14 weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $111 when searching 14 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Ontario for as low as $85 on momondo.
What cabin class options are available on Ontario to San Francisco flights?
There are 4 cabin classes available to choose from on Ontario to San Francisco 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 Ontario to San Francisco?
United Airlines, Frontier, and Southwest are the most popular carriers operating from Ontario to San Francisco
What airlines fly to San Francisco?
Frontier, United Airlines and Alaska Airlines are the top three most popular airlines that fly to San Francisco from Ontario according to our data. Frontier is the first choice among our users, with 38% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 11 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.
How many flights depart from Ontario to San Francisco on average per day?
The number of flights available between Ontario and San Francisco is 5 per day as of June 2025. The most frequent departure time is 6:00PM, with 44% of daily flights leaving in the evening.
How many flights depart from Ontario to San Francisco on average per week?
As of June 2025, there are 40 flights per week flying from Ontario to San Francisco. The most common day of the week flights depart is Wed, with 23% of flights taking off on this day.
When to book flights from Ontario to San Francisco
Cheap Ontario to San Francisco (ONT to SFO) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to San Francisco
Best Price Found | $29 |
|---|---|
Fastest flight time | 1h 19m |
Direct flights | Every day |
Airports in San Francisco | 1 airport |
How far is Ontario to San Francisco by plane?
The straight-line distance from Ontario to San Francisco is 370.2 mi. In terms of flight time, this usually takes a little over 1h 19m.
When did momondo last update prices for flights from Ontario Airport to San Francisco Airport?
Prices for flights from Ontario Airport to San Francisco Airport are updated daily.
How many operators does momondo search for flights from Ontario Airport to San Francisco Airport?
There are 6 operators available for flights from Ontario Airport to San Francisco Airport as of June 2025.
How old do you have to be to fly from Ontario Airport to San Francisco Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Francisco Airport.
What documentation or ID do you need to fly to San Francisco Airport?
The necessary travel and health documents for your San Francisco 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 Ontario to San Francisco?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Ontario to San Francisco is Airbus A320neo (15.58% of total bookings). The next most popular plane models are Airbus A320-100/200 (12.35%), Boeing 737-800 (10.38%), and Embraer 175 (Enhanced Winglets) (8.08%).
What is the most popular airline from Ontario to San Francisco?
momondo data reveals that the most frequently booked airline on the route from Ontario to San Francisco is Frontier, representing 61% of all bookings. The subsequent popular airlines are United Airlines at 37%, Spirit Airlines at 1%, and Alaska Airlines at 1%.
Best airlines flying from Ontario to San Francisco
Compare and see reviews for airlines that fly from Ontario to San Francisco with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $34 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $36 | Free Cancellation | Rating 6.3 8,052 reviews | |||
| PriceFrom $58 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $67 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $85 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $116 | Free Cancellation | Rating 8.0 4,287 reviews |
Southwest Flights From Ontario to San Francisco
Southwest flight deals from Ontario to San Francisco start from $116 round-trip. Over the 2 Southwest flights for this route in a normal week, average airfare is usually $345 round-trip - but some users have found much cheaper deals with momondo.
United Airlines Flights From Ontario to San Francisco
Across 8,790 United Airlines reviews on momondo, the average score is 7.4/10. United Airlines flies from Ontario to San Francisco about 12 times each week, with ticket deals ranging from $58 to $204. Price data is based on momondo searches in the last 72 hours.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Ontario to San Francisco?
It is quick and easy to find Ontario to San Francisco 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 San Francisco that suits you.
Can I find flights from Ontario to San Francisco with flexible booking policies on momondo?
Flights from Ontario to San Francisco with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Ontario to San Francisco?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to San Francisco.
I’m not ready to book a flight from Ontario to San Francisco right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to San Francisco from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.