ONT - SFO

$39 Find Cheap Flights from Ontario to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to San Francisco departing on 12/16. 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
1 adult, Economy, 0 bags

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Francisco, 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 Ontario to San Francisco, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$72
Overall average: $142
United Airlines
Thu 12/4Thu 12/4
ONT - SFO • Non-stop
Cheapest one-way
$39
Typical prices: $68-$159
United Airlines
Tue 12/16
ONT - SFO • Non-stop
Our travelers' advice
AI-generated summary based on content written by travel experts
United's Economy Plus offers extra legroom benefits.
ONT's streamlined security makes it a quick start.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to San Francisco
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Top airlines
United Airlines
Cheapest • from $72 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 26% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
May
Cheapest • 32% price drop
November
Most popular
Good to know
Good to know
+1
+1
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+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Francisco!
Flight Deals
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Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to San Francisco 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 Ontario to San Francisco

Thu, Dec 4 - Thu, Dec 4
United Airlines Logo
6:00 am - 7:24 amONT-SFO
1h 24mnonstop
United Airlines Logo
10:55 am - 12:18 pmSFO-ONT
1h 23mnonstop
$72United Airlines
Find Deal
Wed, Dec 3 - Sat, Dec 6
United Airlines Logo
6:00 am - 7:24 amONT-SFO
1h 24mnonstop
United Airlines Logo
4:16 pm - 5:37 pmSFO-ONT
1h 21mnonstop
$77United Airlines
Find Deal
Fri, Nov 21 - Thu, Dec 4
Frontier Logo
9:59 pm - 11:29 pmONT-SFO
1h 30mnonstop
Frontier Logo
9:03 pm - 10:29 pmSFO-ONT
1h 26mnonstop
$79Frontier
Find Deal
Thu, Dec 4 - Thu, Dec 11
Frontier Logo
10:12 pm - 11:52 pmONT-SFO
1h 40mnonstop
Frontier Logo
9:03 pm - 10:29 pmSFO-ONT
1h 26mnonstop
$82Frontier
Find Deal
Thu, Dec 4 - Sat, Dec 6
Frontier Logo
10:12 pm - 11:52 pmONT-SFO
1h 40mnonstop
Frontier Logo
6:30 am - 2:25 pmSFO-ONT
7h 55m1 stop
$83Frontier
Find Deal
Thu, Dec 4 - Sat, Dec 6
Frontier Logo
10:12 pm - 11:52 pmONT-SFO
1h 40mnonstop
Frontier Logo
6:30 am - 2:25 pmSFO-ONT
7h 55m1 stop
$84Frontier
Find Deal
Thu, Dec 4 - Mon, Dec 8
Frontier Logo
6:15 am - 10:03 pmONT-SFO
15h 48m1 stop
Frontier Logo
10:03 pm - 11:31 pmSFO-ONT
1h 28mnonstop
$85Frontier
Find Deal
Fri, Nov 14 - Mon, Dec 8
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
Frontier Logo
10:03 pm - 11:31 pmSFO-ONT
1h 28mnonstop
$87Frontier
Find Deal
Mon, Nov 17 - Tue, Nov 18
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
Frontier Logo
8:02 am - 9:27 pmSFO-ONT
13h 25m1 stop
$89Frontier
Find Deal
Thu, Dec 4 - Sun, Dec 7
Frontier Logo
2:59 pm - 8:03 pmONT-SFO
5h 04m1 stop
Frontier Logo
10:03 pm - 11:31 pmSFO-ONT
1h 28mnonstop
$90Frontier
Find Deal
Booking Insights

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

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

Find cheap flights to San Francisco
Find cheap flights to San Francisco

Planning a trip from Ontario to San Francisco? 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 Ontario to San Francisco?

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

For Ontario to San Francisco, Friday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from San Francisco back to Ontario, the best deals are generally found on Monday, with Wednesday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to San Francisco, 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 Ontario to San Francisco is May, where tickets cost $89 (return) on average. On the other hand, the most expensive months are November and September, where the average cost of round-trip tickets is $167 and $159 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to San Francisco, 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 Ontario to San Francisco, you should book around 2 weeks before departure, which saves you about 26% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to San Francisco

 
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
United Airlines

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


Purchase Priority Boarding to ensure overhead bin space and avoid gate-checking your carry-on.

Frontier

Choose the Economy Bundle for a carry-on bag and Standard seat choice without change fees.


Avoid Airport Agent Assistance fees by checking in online or at a kiosk.

Read more about Frontierby Stefanie Waldek
Airports
ONT

ONT offers streamlined security with average wait times of 6-15 minutes, making it a convenient choice for business travelers.

Read more about ONTby Jennifer Simonson
SFO

For easy city access, take BART from SFO. It's affordable and connects to popular neighborhoods like the Mission and Embarcadero.

Read more about SFOby Blane Bachelor
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Frontier

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

Good to know

Low seasonApril
Cheapest flight$39
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 27% increase in price.
Flight from Ontario to San Francisco

When to book flights from Ontario to San Francisco

Are your dates flexible? Find out the best times to travel from Ontario to San Francisco 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 Ontario to San Francisco

  • What other airports can I board my flight to SFO other than ONT?

    Apart from ONT, Ontario is served by John Wayne Airport (SNA) and Long Beach Airport (LGB). Of the two, SNA is closer to Ontario than LGB making it the best option if you are looking for something close-by.

  • Where can I breastfeed my child at ONT?

    If you want to breastfeed your baby at ONT, you can do so in one of ONT's two operational nursing rooms. In terminal 2 there’s a nursing room located across from gate 207 and in terminal 4 there is one found across gate 407.

  • Does SFO have a place I can relax once my flight lands?

    Once you land at SFO, you can enjoy the rejuvenating services at one of the three locations operated by XpresSpa. In terminal 3, XpresSpa has a locationnear boarding area E, while the other is found in the boarding area F. The third location is found in the international terminal boarding area G.

  • Can I rent a car at SFO?

    At SFO, you can easily rent a car once you land. To do so, you’ll have to visit the airport’s Car Rental Center, which houses rental agencies like Thrifty, Enterprise, Budget, and Dollar. To get to the airport’s Car Rental Center, you’ll board its AirTrain Blue Line which will take you right there.

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

    In the last 3 days, the lowest price for a flight from Ontario to San Francisco was $39 for a one-way ticket and $72 for a round-trip.

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

    A passport is not required to fly from Ontario to San Francisco.

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

    All the following airlines offer inflight Wi-Fi service on the Ontario to San Francisco flight route: Alaska Airlines, Delta, American Airlines, JetBlue, Japan Airlines, and Hawaiian Airlines.

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Ontario to San Francisco flight route.

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

    oneworld, and Star Alliance are the airline alliances operating flights between Ontario and San Francisco, with oneworld being the most commonly used for this route.

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to San Francisco are Alaska Airlines and Southwest. With an average price for the route of $187 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Southwest is also a great choice for the route, with an average price of $345 and an overall rating of 8.0.

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

    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 Ontario to San Francisco.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Ontario 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 Ontario to San Francisco?

    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 San Francisco with an airline and back to Ontario with another airline. Booking your flights between Ontario and SFO 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 Ontario to San Francisco?

    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 San Francisco from Ontario 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 Ontario to San Francisco

  • Looking for a cheap flight? 25% of our users found flights on this route for $78 or less one-way and $130 or less round-trip.
  • To pass through the security checkpoints at Ontario International Airport (ONT), you’ll need to budget a good amount of time. On many occasions, travelers have missed their flights at this airport after being held up at its checkpoints. To avoid finding yourself in a similar situation, the day you’re set to fly to San Francisco International Airport (SFO) from ONT, you should get to the airport at least 2 hours before your flight.
  • If you want to withdraw some cash before departing from ONT, you can do so without hassle from one of the airport's several ATMs. These ATMs are located on the upper and lower levels of terminals 2 and 4, near the front entrance to the international terminal, and in the airport’s car rental facility.
  • While waiting for your flight to San Francisco at ONT, you can purchase a meal of your choice at one of the airport's numerous restaurants. In terminal 2, you can eat at Wolfgang Puck Pizza, Cross Grain Brewhouse, or Harvest & Grounds. In terminal 4, you can eat at Rock & Brews, Wahoo’s Fish Taco, or Coffee Bean & Tea Leaf.
  • If you need to do some work or fax documents once you land at San Francisco International Airport (SFO), you should check out SFO’s business center. Located in the main hall of the international terminal, the center operates from 8 a.m. to 8:30 p.m.
  • In case you want to leave some of your luggage at SFO before proceeding with your journey, you’ll be happy to hear about SFO’s Airport Travel Agency which offers luggage storage services. They are located in the main hall of the international terminal.

Prefer to fly direct from Ontario to San Francisco?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Ontario to San Francisco.
Find which airlines fly direct from Ontario Airport to San Francisco Airport, which days they fly and book direct flights.

Direct departures

Ontario to San Francisco

Monday

Frontier, United Airlines

Frontier, United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Frontier, United Airlines

Frontier, United Airlines

Friday

Frontier, United Airlines

Frontier, United Airlines

Saturday

United Airlines

United Airlines

Sunday

Frontier, United Airlines

Frontier, United Airlines

See more direct flights

Direct returns

San Francisco to Ontario

Monday

Frontier, United Airlines

Frontier, United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Frontier, United Airlines

Frontier, United Airlines

Friday

Frontier, United Airlines

Frontier, United Airlines

Saturday

United Airlines

United Airlines

Sunday

Frontier, United Airlines

Frontier, United Airlines

See more direct flights

Reviews of the top 4 airlines serving from Ontario to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Ontario to San Francisco. 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 Ontario to San Francisco? 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 11247 reviews
7.0Entertainment
7.8Comfort
8.1Boarding
7.1Food
8.5Crew
Airline reviews

Overall the flight was on-time and plane ride very comfortable. The free snacks not so good - only a small bag of pretzels and no milk. I wanted milk. There was not entertainment on the plane unless I wanted to download their APP. But I would consider flying with them again and be more prepared on my part with food and entertainment.

10.0 ExcellentSara, Oct 2025JFK - SFO
Read more Alaska Airlines reviews

Overall the flight was on-time and plane ride very comfortable. The free snacks not so good - only a small bag of pretzels and no milk. I wanted milk. There was not entertainment on the plane unless I wanted to download their APP. But I would consider flying with them again and be more prepared on my part with food and entertainment.

This was more with the third party booking through Kayak but my KTN for Pre-TSA, even though I entered it, wasn't assigned to my ticket when I got to the airport. I had to go through regular security. Also the Alaska app had trouble loading my ticket in the first place and I had to ask for it to be printed. Alaska Airlines was great but wanted you to know about this hiccup in the ticketing interface.

this was the THIRD time in four Alaska flights that were 2 hours late. Only one was due to weather. The intentionally posted each flight as only 1 hour and 55 minutes late so that they wouldn't have to give out vouchers. And then the flights all ended up more than 2 hours late. Makes United look like a premium carrier.

It was fine, mostly I was just happy to be on my last leg home. No in flight entertainment but that's forgivable since it was only a 2 hour flight.

Flight was cancelled, then rebooked on a flight that I was unable to get through since they had closed the gate.

This was likely the smallest, oldest plane I've been on. It didn't handle turbulence well and we were all jostled a lot more than I'm used to. At least it was a short flight.

Boarding process was poorly handled by the gate crew and the onboard crew. No effort was made to provide equal treatment to passengers with overhead bin space. Crew seemed disengaged and unfriendly.

It was a good experience! Thank you:) No sparkling mineral water… 🥲

On time, WiFi worked, reasonable legroom, helpful staff. Unfortunately there was no water for handwashing in the rear lavatory.

Miss bigger screens for movies Staff was friendly Seats comfortable Bathroom line long

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Connecting flight is on time and boarding was a breeze!

Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

It was a perfect flight in all aspects! Both legs!

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Subject: Formal Complaint: Discriminatory and Unprofessional Conduct – Request for Immediate Action & Compensation Dear [Airline Customer Relations Team], I am writing to file a formal complaint regarding my recent travel experience with [Airline], which was by far the worst I have ever encountered. What occurred was not only unprofessional, but in several instances discriminatory, unsafe, and unacceptable. On the first leg of my trip, I arrived only four minutes past check-in. Instead of making any attempt to resolve the matter, your representative flatly denied me boarding and made me wait while she attended to passengers who arrived after me. By the time a manager intervened, it was too late to board, costing me time, money, and unnecessary frustration. The second leg of my trip (Chicago–San Francisco) raised even more serious concerns. From the outset, it was apparent that the staff—particularly two attendants—prioritized Caucasian passengers while dismissing African American and minority passengers. • When a Caucasian passenger in the exit row refused to comply with federal safety requirements, I, as a first responder, immediately offered to switch seats and assume the responsibility. My offer was blatantly ignored, and instead, a Caucasian passenger seated further up was chosen. This was discriminatory and deeply insulting, especially as I was actively de-escalating the situation that could have delayed the flight further. • During a lengthy tarmac delay of over 90 minutes, passengers were given conflicting and unreasonable instructions that created unnecessary distress and tension. • Throughout the flight, a visibly intoxicated passenger directly in front of me was disruptive, rude to others, failed to comply with seatbelt and electronic device rules, and yet faced no enforcement from the crew. In stark contrast, I was singled out for repeated compliance checks even though I was following every rule. This unequal treatment was so obvious that multiple passengers around me spoke up in my defense. This pattern of behavior demonstrated a clear lack of professionalism, disregard for passenger safety, and discriminatory treatment. I expect far better from an airline of your stature. As a paying customer subjected to this unacceptable treatment, I am formally requesting: 1. A full investigation into the conduct of the staff on both flights. 2. A written apology acknowledging the discriminatory and unprofessional behavior I endured. 3. Appropriate compensation for the distress, inconvenience, and mishandling of my travel. If this matter is not addressed promptly and thoroughly, I will have no choice but to escalate my complaint further, including filing with the U.S. Department of Transportation and sharing my experience through other channels. I trust [Airline] will take this complaint seriously and provide a timely resolution.

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

Boarded plane and then delayed 1.5 hours while on the plane

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

Very bad! No good service delayed my second connection flight

They canceled flight. Hard to believe there was even a plane incoming for us to get on

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

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

Other airlines flying from Ontario to San Francisco

Flights from the other most popular airlines that fly from Ontario to San Francisco according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.