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Cheap Flights from San Francisco International to Ontario International

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 Airport to Ontario International Airport? If you want to travel next month, return fares start from R 754. Find the lowest prices on one-way and return tickets right here.
Ontario.R 377 per passenger.Departing Sat, 15 Aug.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Sat, 15 Aug, arriving in Ontario International.Price includes taxes and charges.From R 377, select.
Ontario.R 377 per passenger.Departing Wed, 2 Sep.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Wed, 2 Sep, arriving in Ontario International.Price includes taxes and charges.From R 377, select.
Ontario.R 458 per passenger.Departing Mon, 16 Nov.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Mon, 16 Nov, arriving in Ontario International.Price includes taxes and charges.From R 458, select.
Ontario.R 459 per passenger.Departing Thu, 1 Oct.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Thu, 1 Oct, arriving in Ontario International.Price includes taxes and charges.From R 459, select.
Ontario.R 1,283 per passenger.Departing Thu, 10 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Francisco International on Thu, 10 Dec, arriving in Ontario International.Price includes taxes and charges.From R 1,283, select.
Ontario.R 1,480 per passenger.Departing Thu, 7 Jan.One-way flight with United.Outbound direct flight with United departs from San Francisco International on Thu, 7 Jan, arriving in Ontario International.Price includes taxes and charges.From R 1,480, select.
Ontario.R 1,480 per passenger.Departing Tue, 1 Dec.One-way flight with United.Outbound direct flight with United departs from San Francisco International on Tue, 1 Dec, arriving in Ontario International.Price includes taxes and charges.From R 1,480, select.
Ontario.R 2,114 per passenger.Departing Wed, 3 Mar.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Francisco International on Wed, 3 Mar, arriving in Ontario International.Price includes taxes and charges.From R 2,114, select.
Ontario.R 2,115 per passenger.Departing Mon, 1 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Francisco International on Mon, 1 Feb, arriving in Ontario International.Price includes taxes and charges.From R 2,115, select.
Ontario.R 2,189 per passenger.Departing Tue, 30 Mar.One-way flight with Lufthansa.Outbound direct flight with Lufthansa departs from San Francisco International on Tue, 30 Mar, arriving in Ontario International.Price includes taxes and charges.From R 2,189, select.
Ontario.R 2,740 per passenger.Departing Tue, 28 Jul.One-way flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Francisco International on Tue, 28 Jul, arriving in Ontario International.Price includes taxes and charges.From R 2,740, select.
Ontario.R 2,940 per passenger.Departing Mon, 5 Apr.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Francisco International on Mon, 5 Apr, arriving in Ontario International.Price includes taxes and charges.From R 2,940, select.
Ontario.R 3,103 per passenger.Departing Fri, 30 Apr.One-way flight with United.Outbound direct flight with United departs from San Francisco International on Fri, 30 Apr, arriving in Ontario International.Price includes taxes and charges.From R 3,103, select.
Ontario.R 4,833 per passenger.Departing Tue, 4 May.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from San Francisco International on Tue, 4 May, arriving in Ontario International.Price includes taxes and charges.From R 4,833, select.
Ontario.R 5,033 per passenger.Departing Tue, 1 Jun.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from San Francisco International on Tue, 1 Jun, arriving in Ontario International.Price includes taxes and charges.From R 5,033, select.
Ontario.R 15,458 per passenger.Departing Sat, 19 Jun.One-way flight with United.Outbound direct flight with United departs from San Francisco International on Sat, 19 Jun, arriving in Ontario International.Price includes taxes and charges.From R 15,458, 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 August.
Jul
from R 2,740
Aug
from R 377
Sep
from R 377
Oct
from R 459
Nov
from R 458
Dec
from R 1,283
Jan
from R 1,480
Feb
from R 2,115
Mar
from R 2,114
Apr
from R 2,940
May
from R 4,833
Jun
from R 5,033

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.

Ontario International

4km from central Ontario
Closest
from R 377
Search flights

San Bernardino Norton AFB

39km from central Ontario
from R 720
Search flights

Santa Ana John Wayne

48km from central Ontario
from R 771
Search flights

Long Beach Municipal

54km from central Ontario
from R 2,179
Search flights

Hawthorne

65km from central Ontario
from R 6,829
Search flights

Burbank

67km from central Ontario
from R 755
Search flights

Los Angeles International

71km from central Ontario
Cheapest
from R 311
Search flights

San Francisco to Ontario: Flight information

The things to know before you go.
Cheapest flight foundR 377
Cheapest month to flySeptember
Average flight time1 hr, 34 mins
Most popular airlineUnited
Average flights per week103

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 R 754. 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 34 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 July 2026, there are 103 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 August.
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 Wednesday, 12 August 2026.
Yes – the average flight time is 1 hour and 34 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, Frontier Airlines 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 length of a direct flight from San Francisco International Airport to Ontario International Airport is 1 hour 35 minutes.

  • Ontario's timezone is UTC-8, which is the same as San Francisco.

  • Flights from SFO to ONT start at 07:15 — the first with United Airlines. The last departure is at 22:50 with United Airlines. Overall, there are 24 weekly San Francisco International Airport to Ontario International Airport flights.

  • For a smooth journey, arrive at the airport two hours ahead of international flights and an hour before domestic departures. This way, you'll have plenty of time to catch your SFO to ONT flight.

  • During popular months such as July, you'll want to get to the airport earlier than normal. Arrive two hours before a domestic departure and four hours ahead for international flights whenever you're travelling during a peak period in general.

  • Travelling to Ontario (and then seeing more of the United States!) is a breeze with United. This popular carrier has direct flights from San Francisco International Airport to Ontario International Airport.

  • United tops the list for bookings on this route.

  • United is the most punctual carrier offering SFO to ONT flights, with 79.47% of its services landing on schedule.

  • We make it easy to book a flight with a stopover. To see your options for tickets from San Francisco International Airport to Ontario International Airport, uncheck 'Direct flights only.' Then, choose a flight with a stop long enough to tour the city of your choice. Worthwhile stopovers between SFO and ONT include:

    • Phoenix Sky Harbour Airport

    • Harry Reid International Airport

    • Sacramento International Airport

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

  • R 377 is the lowest price for a one-way San Francisco International Airport to Ontario International Airport flight. A return flight starts at R 754. These prices may change based on availability.

  • To get cheap tickets from SFO to ONT, reserve your journey 11 months ahead of your departure.

  • The cheapest month for flights from San Francisco International Airport to Ontario International Airport is April. Use the 'Whole month' tool to see the lowest airfares if you have a flexible travel schedule.

  • Never miss a deal on cheap flights from SFO to ONT by setting up a Price Alert. You'll receive an email or push notification on the app when a lower fare pops up.

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

Handy information about San Francisco International Airport (SFO)

  • Of all flights leaving San Francisco International Airport, 78% land on time at their destination.

  • San Francisco International Airport is around 21 kilometres from central San Francisco. If you're ride-sharing, catching a taxi or driving from the centre, it'll take you 25 minutes or so to arrive, depending on the traffic.

  • You can expect a trip time of around 35 minutes on public transport.

  • Get your trip off to a leisurely start by staying near SFO. Whether you've booked an early flight from San Francisco International Airport to Ontario International Airport or just don't want to be rushed, these hotels are ideal:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • You'll find ONT at 2900 E. Airport Drive.

  • Ontario International Airport is roughly 10 kilometres from the centre of Ontario. The drive time takes around 15 minutes.

  • It'll take around 45 minutes if you're travelling on 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 March, while July is the busiest. Pick the ideal time to go to Ontario based on whether you prefer a more relaxed vibe or a faster pace.

  • Lock in your flight from San Francisco International Airport to Ontario International Airport for August if you want to explore Ontario during its warmest month. You can expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

  • If you like travelling in cooler conditions, search for a cheap ticket from SFO to ONT in February. Average temperatures are between 4ºC (39ºF) and 24ºC (75ºF) then.

Explore more of the United States

  • Ontario is easy to fall in love with, but there are so many other corners of the United States waiting to be explored. Around 56 kilometres west of Ontario, a trip to Los Angeles will keep you on the go. Don't miss top attractions like Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

  • San Diego is another standout destination in the United States and is around 153 kilometres south of Ontario. No journey is complete without a visit to San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

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 12 days.