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Cheap flight tickets from San Francisco International to Ontario International

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Compare San Francisco International to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from San Francisco International to Ontario International

Looking for a cheap last-minute deal or the best return flight from San Francisco International to Ontario International? Find the lowest prices on one-way and return tickets right here.
Ontario.RM222 per passenger.Departing Thu, 29 May, returning Thu, 29 May.Return flight with United.Outbound direct flight with United departs from San Francisco International on Thu, 29 May, arriving in Ontario International.Inbound direct flight with United departs from Ontario International on Thu, 29 May, arriving in San Francisco International.Price includes taxes and charges.From RM222, select.
Ontario.RM223 per passenger.Departing Tue, 24 Jun, returning Tue, 24 Jun.Return flight with United.Outbound direct flight with United departs from San Francisco International on Tue, 24 Jun, arriving in Ontario International.Inbound direct flight with United departs from Ontario International on Tue, 24 Jun, arriving in San Francisco International.Price includes taxes and charges.From RM223, select.
Ontario.RM247 per passenger.Departing Fri, 30 May, returning Sun, 1 Jun.Return flight with United.Outbound direct flight with United departs from San Francisco International on Fri, 30 May, arriving in Ontario International.Inbound direct flight with United departs from Ontario International on Sun, 1 Jun, arriving in San Francisco International.Price includes taxes and charges.From RM247, select.
Ontario.RM337 per passenger.Departing Fri, 11 Jul, returning Mon, 14 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Fri, 11 Jul, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Mon, 14 Jul, arriving in San Francisco International.Price includes taxes and charges.From RM337, select.
Ontario.RM346 per passenger.Departing Mon, 4 Aug, returning Mon, 11 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Mon, 4 Aug, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Mon, 11 Aug, arriving in San Francisco International.Price includes taxes and charges.From RM346, select.
Ontario.RM432 per passenger.Departing Sun, 29 Jun, returning Sun, 6 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Sun, 29 Jun, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Sun, 6 Jul, arriving in San Francisco International.Price includes taxes and charges.From RM432, select.
Ontario.RM593 per passenger.Departing Wed, 30 Apr, returning Fri, 2 May.Return flight with United.Outbound direct flight with United departs from San Francisco International on Wed, 30 Apr, arriving in Ontario International.Inbound direct flight with United departs from Ontario International on Fri, 2 May, arriving in San Francisco International.Price includes taxes and charges.From RM593, select.
Ontario.RM707 per passenger.Departing Wed, 30 Jul, returning Fri, 1 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Francisco International on Wed, 30 Jul, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 1 Aug, arriving in San Francisco International.Price includes taxes and charges.From RM707, select.

Find the cheapest month to fly from San Francisco International to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Francisco International to Ontario International flights are currently cheapest in May.
Apr
from RM2,702
May
from RM222
Jun
from RM223
Jul
from RM337
Aug
from RM346
Sep
from RM937
Oct
from RM945
Nov
from RM842
Dec
from RM1,119
Jan
Find prices
Feb
Find prices
Mar
Find prices

Direct flights from San Francisco International to Ontario International

San Francisco International to Ontario International: Alternative routes

Compare routes from San Francisco International to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

San Francisco to Ontario: Flight information

The things to know before you go.
Cheapest flight foundRM222
Cheapest month to flyMay
Average flight time1 hr, 31 mins
Most popular airlineUnited
Average flights per week113

Finding cheap flights from San Francisco International to Ontario International: Frequently asked questions

The best price we found for a return flight from San Francisco International to Ontario International is RM222. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 31 minutes is the average flight time from San Francisco International to Ontario International.
United, Air Canada and SkyWest Airlines fly direct from San Francisco International to Ontario International.
As of April 2025, there are 113 flights per week flying from San Francisco International to Ontario International.
The cheapest month to fly from San Francisco International to Ontario International is usually April 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Francisco International Airport to Ontario International Airport on Thursday, 29 May 2025.
Yes – the average flight time is 1 hour and 31 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, United offers the cheapest flight tickets to Ontario International.

Travelling from San Francisco International Airport (SFO) to Ontario International Airport (ONT): what you need to know

  • The average time for a direct flight from San Francisco International Airport to Ontario International Airport is 1 hour 25 minutes.

  • Ontario's timezone is UTC-7, which is the same as San Francisco.

  • Flights from SFO to ONT start from 05:15 — the earliest with Frontier Airlines. The last service of the day is at 23:19 with United Airlines. Overall, you can take your pick of 88 weekly San Francisco International Airport to Ontario International Airport flights.

  • Leave enough time to make your SFO to ONT flight. As a general rule, arrive at least two hours before international departures and an hour ahead for domestic flights.

  • You can expect bigger queues in popular months like August. Arriving up to four hours ahead of international flights and two hours for domestic departures is a wise move.

  • Frontier Airlines has direct flights from San Francisco International Airport to Ontario International Airport. Book with this popular airline, then get ready to discover the sights in Ontario — and maybe even more of United States if you have time.

  • The airline that tops the list for bookings on this route is Frontier Airlines.

  • With 78.66% of its services arriving as scheduled, United Airlines is the most punctual carrier offering SFO to ONT flights.

  • If you want to add a stop to your trip, simply deselect 'Direct flights only' when searching for your ticket from San Francisco International Airport to Ontario International Airport. These are the most popular stopovers between SFO and ONT:

    • Harry Reid Airport (formerly McCarran Airport)

    • Sacramento International Airport

    • Phoenix Sky Harbour International Airport

How to find the cheapest flights from San Francisco International Airport (SFO) to Ontario International Airport (ONT)

  • Right now, RM123 is the cheapest price we've found for a one-way San Francisco International Airport to Ontario International Airport flight. The best price for a return ticket is RM222. Bear in mind that fares could change due to availability when booking.

  • Book five months before travelling. After crunching the numbers on our calendar, this is how far you should book ahead to find cheap tickets from SFO to ONT.

  • Organise your trip for April. That's the cheapest month for flights from San Francisco International Airport to Ontario International Airport. If you're flexible on when you fly, try out the 'Whole month' tool to find the lowest airfare across every month.

  • You don't need to check back in every day to see if fares have gone down when you set up a Price Alert. We'll notify you the moment there's a better deal on cheap flights from SFO to ONT.

  • Choose your ideal arrival and departure times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from San Francisco International Airport to Ontario International Airport.

Handy information about San Francisco International Airport (SFO)

  • When it comes to the on-time performance of San Francisco International Airport, 77.36% of flights complete their journey on time.

  • San Francisco International Airport is about 21 kilometres from central San Francisco. If you're driving, ride-sharing or catching a cab from the centre, it'll take you 20 minutes or so to arrive, depending on the traffic.

  • Catching public transport? Expect a journey time of around 45 minutes.

  • Looking for a handy hotel near SFO? If you're catching an early flight from San Francisco International Airport to Ontario International Airport, these stays will have you sleeping moments from your departure gate:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport to central Ontario has a drive time of around 10 minutes. It's approximately 6 kilometres away.

  • It takes roughly 1 hour 30 minutes to get there by public transport.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from San Francisco International Airport to Ontario International Airport is May, while August is the busiest. Pick the best time to go to Ontario based on whether you prefer a faster pace or a more relaxed vibe.

  • Before locking in your flight from San Francisco International Airport to Ontario International Airport, think about the type of weather you enjoy. August is the warmest month in Ontario, with temperatures ranging from 15ºC (59ºF) to 35ºC (95ºF).

  • If you like cooler conditions, search for a cheap ticket from SFO to ONT in January. Temperatures average between 4ºC (39ºF) and 23ºC (73ºF) then.

Explore more of United States

  • You've visited Ontario, now it's time to discover other parts of United States. Journey about 56 kilometres west to Los Angeles to tick off its top attractions. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, your itinerary will be busy.

  • Around 153 kilometres south of Ontario, San Diego is another favourite stop in United States. Start your sightseeing at San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Plan the rest of your trip from San Francisco to Ontario

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.