SFO - ONT

$28 Find Cheap Flights from San Francisco to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Ontario departing on 6/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Ontario, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Expert advice
Useful Info
Flights Deals

Cheap Flights from San Francisco to Ontario (SFO-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to Ontario

Wed, Jun 25 - Sun, Jun 29
United Airlines Logo
9:18 pm - 10:45 pmSFO-ONT
1h 27mnonstop
United Airlines Logo
6:10 am - 7:37 amONT-SFO
1h 27mnonstop
$57United Airlines
Find Deal
Mon, Aug 18 - Thu, Aug 28
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
Frontier Logo
9:41 pm - 11:13 pmONT-SFO
1h 32mnonstop
$59Frontier
Find Deal
Fri, Jul 11 - Sun, Jul 13
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
$60Frontier
Find Deal
Fri, Jun 6 - Mon, Jul 14
Frontier Logo
10:11 pm - 11:39 pmSFO-ONT
1h 28mnonstop
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
$64Frontier
Find Deal
Fri, Jun 6 - Sun, Jun 8
Frontier Logo
10:11 pm - 11:39 pmSFO-ONT
1h 28mnonstop
Frontier Logo
9:41 pm - 11:15 pmONT-SFO
1h 34mnonstop
$69Frontier
Find Deal
Sun, Jul 27 - Mon, Jul 28
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
$74Frontier
Find Deal
Sun, Jul 6 - Sun, Jul 13
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
$75Frontier
Find Deal
Mon, Jun 2 - Mon, Jun 9
Frontier Logo
10:11 pm - 11:39 pmSFO-ONT
1h 28mnonstop
Frontier Logo
9:41 pm - 11:15 pmONT-SFO
1h 34mnonstop
$79Frontier
Find Deal
Fri, Jul 4 - Sun, Jul 6
Frontier Logo
10:11 pm - 11:39 pmSFO-ONT
1h 28mnonstop
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
$84Frontier
Find Deal
Tue, Jul 8 - Fri, Jul 11
United Airlines Logo
4:16 pm - 5:43 pmSFO-ONT
1h 27mnonstop
United Airlines Logo
6:39 pm - 8:06 pmONT-SFO
1h 27mnonstop
$91United Airlines
Find Deal
Expert advice

Expert advice for your flight from San Francisco to Ontario

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Frontier

Frontier's Premium Bundle offers priority boarding and extra legroom for just $20 more than Economy.


Avoid middle seats by selecting Economy Bundle for free Standard seat selection and carry-on bag.

Read more about Frontierby Stefanie Waldek
United Airlines

United's Economy Plus offers up to six inches more legroom than standard economy seats.


United offers free messaging on most flights, with additional Wi-Fi options available.

Airports
SFO

SFO offers curbside check-in for United, Delta, and Southwest, making it convenient for travelers with kids or heavy luggage.

Read more about SFOby Blane Bachelor
ONT

For a budget-friendly arrival, use Omnitrans Bus Route 61 from ONT to nearby transit centers, operating frequently during peak hours.

Read more about ONTby Jennifer Simonson
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier and United Airlines

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson

Jennifer Simonson

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more
Blane Bachelor

Blane Bachelor

Expert on SFO

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Useful Info

KAYAK's insights & trends for San Francisco to Ontario flights

Get data-powered insights and trends into flights from San Francisco to Ontario to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Ontario
Find cheap flights to Ontario

Planning a trip from San Francisco to Ontario? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from San Francisco to Ontario?

The average price of all round-trip flights from San Francisco to Ontario clicked on KAYAK for each day over the last 12 months.

When flying from San Francisco to Ontario, you should consider leaving on a Monday and avoid Tuesdays if you are looking for the best rates. For your return to San Francisco, you’ll find the best rates on Fridays and the most expensive ones on Tuesdays.

What is the cheapest month to fly from San Francisco to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Ontario is July, where tickets cost $91 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $235 and $157 respectively.

How far in advance should I book a flight from San Francisco to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Francisco to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Francisco to Ontario, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Low seasonFebruary
High seasonNovember
Cheapest flight$28
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 15% increase in price.
Flight from San Francisco to Ontario

When to book flights from San Francisco to Ontario

Are your dates flexible? Find out the best times to travel from San Francisco to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from San Francisco to Ontario

  • What happens upon losing an item at ONT?

    If you have lost your item when traveling to ONT, you can visit the lost and found offices. The offices are in terminal 2 just behind the information desk. The lost and found offices operate from Monday through Friday from 7am to 3:30pm.

  • Are there any electric vehicle charging stations at SFO?

    Yes, there are several electric vehicles charging stations that are easily accessible. The charging stations are located at the domestic garage level 1, Long-term garage 2, and the international garage level 2. The charging stations are available on a first-come, first-served basis.

  • Is SFO safe for kids?

    Yes, SFO airport is child-friendly and you can travel with your children easily. Several nursery spots are located at terminals 1, 2, and 3, international terminal A gates, international terminal main hall, and international terminal G gates. There are shower facilities at the entire airport to enable you to freshen up before traveling with your child.

  • Is safety assured at ONT?

    At ONT airport, there are security screening procedures to guarantee your safety. The security screening commences upon your arrival at the airport. It is advisable to declare all your electronics at the security screening center to avoid inconveniences. The security screening procedures often change; hence it’s advisable to be flexible and adjust accordingly.

  • What is the cheapest flight from San Francisco to Ontario?

    In the last 3 days, the lowest price for a flight from San Francisco to Ontario was $28 for a one-way ticket and $57 for a round-trip.

  • Do I need a passport to fly between San Francisco and Ontario?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from San Francisco to Ontario?

    On your way to Ontario, you’ll fly out from San Francisco. You’ll be landing at Ontario.

  • Which airlines offer Wi-Fi service onboard planes from San Francisco to Ontario?

    Alaska Airlines, Delta, American Airlines, and Hawaiian Airlines offer inflight Wi-Fi service on the San Francisco to Ontario flight route.

  • Which aircraft models fly most regularly from San Francisco to Ontario?

    The Airbus A320neo is the aircraft model that flies most regularly on the San Francisco to Ontario flight route.

  • Which airline alliances offer flights from San Francisco to Ontario?

    Star Alliance is the only airline alliance operating flights between San Francisco and Ontario.

  • On which days can I fly direct from San Francisco to Ontario?

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

  • Which is the best airline for flights from San Francisco to Ontario, Alaska Airlines or United Airlines?

    The two airlines most popular with KAYAK users for flights from San Francisco to Ontario are Alaska Airlines and United Airlines. With an average price for the route of $206 and an overall rating of 8.0, Alaska Airlines is the most popular choice. United Airlines is also a great choice for the route, with an average price of $234 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from San Francisco to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from San Francisco is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from San Francisco to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $39 or less one-way and $59 or less round-trip.
  • Want to secure a parking spot in advance when traveling to Ontario International Airport (ONT)? It is advisable to book early via the online system. This will enable you to choose your parking spot and ideal date and time. With this booking, there is an assurance your parking spot will be vacant before your arrival. There is tightened security at the parking lot; hence no need to worry about the security of your vehicle.
  • Upon arriving at San Francisco International Airport (SFO), you can get access to free Wi-Fi. The Wi-Fi is strong in all terminals enabling you to watch your favorite movie or game while waiting to catch your flight. You only need to select the SFO Wi-Fi network and launch your browser.
  • You can only travel with your pet at SFO airport if it is kenneled. Your pet will be delivered to the baggage claim area if traveling with it. Before your flight commences, you can take your pet to the relief areas located in terminals 1, 2, and 3. If you wish to import or export a pet at SFO, it is advisable to make prior arrangements to minimize any inconveniences.
  • There is a medical clinic onsite at SFO where you can visit in case you feel unwell. The clinic features state-of-the-art equipment to aid in your treatment. Upon diagnosis, you will be provided with travel medicine to make you feel better. The average wait time is less than 15min, but you can book an appointment before arrival.
  • SFO features an AirTrain that connects all the airport terminals at the airport. Some of the items allowed on the AirTrain include animals, bicycles, and airport luggage carts. The departure time is always indicated on the screens

Prefer to fly direct from San Francisco to Ontario?

Find which airlines fly direct from San Francisco Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

San Francisco to Ontario

Monday

Air Canada, Emirates, Frontier, +1 more

Air Canada, Emirates, +2 more

Tuesday

Air Canada, Emirates, United Airlines

Air Canada, Emirates, +1 more

Wednesday

Air Canada, Emirates, United Airlines

Air Canada, Emirates, +1 more

Thursday

Air Canada, Emirates, United Airlines

Air Canada, Emirates, +1 more

Friday

Air Canada, Emirates, Frontier, +1 more

Air Canada, Emirates, +2 more

Saturday

Air Canada, Emirates, United Airlines

Air Canada, Emirates, +1 more

Sunday

Air Canada, Emirates, Frontier, +1 more

Air Canada, Emirates, +2 more

See more direct flights

Direct returns

Ontario to San Francisco

Monday

Air Canada, Copa Airlines, Emirates, +2 more

Air Canada, Copa Airlines, +3 more

Tuesday

Air Canada, Copa Airlines, Emirates, +1 more

Air Canada, Copa Airlines, +2 more

Wednesday

Air Canada, Copa Airlines, Emirates, +1 more

Air Canada, Copa Airlines, +2 more

Thursday

Air Canada, Copa Airlines, Emirates, +1 more

Air Canada, Copa Airlines, +2 more

Friday

Air Canada, Copa Airlines, Emirates, +2 more

Air Canada, Copa Airlines, +3 more

Saturday

Air Canada, Copa Airlines, Emirates, +1 more

Air Canada, Copa Airlines, +2 more

Sunday

Air Canada, Copa Airlines, Emirates, +2 more

Air Canada, Copa Airlines, +3 more

See more direct flights
See more direct flights

Top 5 airlines serving from San Francisco to Ontario

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Francisco to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 10000 reviews
8.2Boarding
7.1Entertainment
7.1Food
8.5Crew
7.9Comfort
Airline reviews

Flight last minute delayed 2 hours for crew calling out sick

4.0 OkaySalina, May 2025PDX - ONT
Read more Alaska Airlines reviews

Flight last minute delayed 2 hours for crew calling out sick

Great, overall. Thicker seat cushion would be nice. My butt hurt the whole flight.

Thicker seat cushion would be nice. My butt hurt the whole flight.

All good! No entertainment on this new plane yet but ok for this short flight. Great on time flight! Thanks

No non-alcoholic drinks available except water and small apple juice cans.

Alaska Airlines needs more bag tag kiosks and bag check-in stations in Seattle. A single entry point for the bag tag kiosks would be helpful. This alleviates lines forming at each individual kiosk, which causes traffic jams for people passing through.

The flight was delayed over two and a half hours thus causing me to miss my best friend’s funeral. All because the flight crew had to get more rest. That was the reason stated. I understand however very unfortunate. Glad everyone is well rested and resting in peace.

All good except both the outbound and return flights were delayed about 1 1/2 hrs.

Not great. My flight was canceled due to a mechanical problem and I could not get rebooked for the same day. I needed to get to my destination yesterday, not today. I was able to book with another airline but it was a layover and ultimately a 1 hour flight took me 12 hours. Normally I like Alaska much more than Southwest, but Southwest came through with a not terrible price for same day.

The plane was late arriving. The Alaska people did a great job of turning it around quickly and getting us off. We took off about 35 minutes after it reached the gate.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Seats are much much more comfortable than United, which is what I usually fly

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

If I pay extra for "comfort+" I expect leg room where I can stretch my legs. I was seated with an attendant's seat blocking my feet. Knee space was fine but my feet had less room than the non-"comfort+" seats. Also, don't go cheap on food when you have flights of 3+ hours. It's insulting.

Only one side of the heafphone jack work. Crew was friendly and helpful.

Great. Flight departed early and arrived early. Deplaning and baggage claim ww were quick.

They separated our seats and moved us to the back of the plane. Hundreds of dollars and thousands of miles used and this was my platinum member experience.

New boarding doesn't make sense. Filling front first is slow.

AC barely worked on a 50 minute flight. It was very warm the whole flight. Flight was very bumpy and hard landing.

Boarding seemed to be organized bedlam. For what ever reason, preboarding took longer than 20 minutes. Made the plane 20 minutes late taking off. Luckily we arrived on time. Flight crew seemed very friendly. Only slight turbulence.

They hired a new catering company the same day of my flight. They botched the job by not delivering the right carts and after THREE HOURS waiting, the flight crew timed out (flight was 19 hours long and FAA rules state crew can’t work more than 14 hours long). So they CANCELED OUR FLIGHT!! Worst experience ever. Avoid UAL at all costs.

The personnel were professional and friendly. The Boeing 737 Max 9 is too claustrophobic and was very warm at both airport gates, and still warm in the air.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

get E+, a must for 5 hours flight if you are tall

Liked fold flat bed. Didn’t like having no window. Didn’t like poor choice of food and being served dinner very late, hours after take off of a 7:40pm flight. Servers not friendly. Food horrible in business class.

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

Compared with other carriers business class for an overnight was not worth the extra expense.

Easy to board. Flight was super crowded though so I didn't sleep well on that cross country red-eye flight. The aisles seem ot have gotten narrower and the seat smaller whn luggage and people are getting bigger so it would be AWESOME to have more space and breathing room in general ;)

Pilot Erika DeLong made us feel safe and at ease in a frankly scary time to be flying. Her warm smile and greeting and excellent command of the aircraft in foggy bumpy weather helped us all to calm our nerves and get us home safely.

hahaha we are delayed for one hour plus.. but thx we arrived San Diego safe

Worst airline ever! The guy weighing my bag had his foot on the metal plate and when I called him out on it, I got this stupid little smirk. La is a scam and so is Spirit Airlines. All the flight attendants looked like they hated our flight just as much as we did.

Unclear pricing; ended up being charged an extra $52 just to get onboard

Spirit is awful. Too expensive for what you get. Stop nickel and diming.

would be great to get basic water, soda at least and stop charging for carry ons

Your crew is a representation of your Standards and Values. The crew from Seattle to LAX, was very disappointing. The crew was more interested in hanging out at the lobby area. Talking, laughing loudly and eating all the snacks. They did not do regular rounds to see if customers needed anything. This was a huge disappointment. I will no longer be flying with your airlines moving forward.

- flight attendants not very friendly. - Paid for WiFi and plane didn’t have it working , never got a refund.

We got to fly on the new airplane. Much better as it’s roomier and cleaner than before. Most Importantly it’s much more comfortable. I still can’t move the seat back but the extra space made up for it. I didn’t taste the food or drinks because they charge for everything so I didn’t bother. I didn’t experience the entertainment because I downloaded my own movies on my phone. The crew was great. The flight itself was smooth . No complaints.

I was comfortable because I upgraded. I would not have been comfortable in economy. It was a short flight so there was limited food service and no inflight entertainment.

I thought since I upgraded my seat I would get some perks. Free water, free snacks. Free carry on luggage.

The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Everything went as planned. Crew was great. Seats were still not that comfortable.

No frills for sure. No gate announcements about flight delay, not even water to drink on the flight.

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

The plane was clean, the crew was friendly and helpful. It’s a low cost airline so there was no food, drinks or in flight entertainment but we didn’t expect any of these things. In the room for improvement department, they should install USB ports in seats to charge mobile devices.

I was surprised that all baggage, including carry on, were charged. Each additional bag went up in cost. Really disappointed in the additional costs.

It was a redeye flight, so every passenger just wanted to sleep, but through the entire flight, the flight crew made announcements over the loudspeaker at maximum volume every few minutes making sleep impossible. For example: it’s 2am, and the crew decides to give an extremely detailed announcement about snacks and beverages for sale. And 3am is the perfect time to wake up everyone with a lengthy announcement about how to get a coffee refill and how to take advantage of new offer from frontier for a credit card.

Charges unexpected. For seat that didnt recline. Please reverse extra seat and carryon charge. Bad business that is a bait and switch.

I couldn’t check in because the app didn’t work. It took 3 Frontier employees at the counter to get me checked in. Flight left 3 hours after departure time

Everything you need to know for your flight from San Francisco to Ontario

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.