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Cheap Flights from San Diego International (SAN) to Ontario International (ONT)

Compare San Diego 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 Diego International to Ontario International

Looking for a cheap last-minute deal or the best return flight from San Diego International Airport to Ontario International Airport? If you want to travel next month, return fares start from £93. Find the lowest prices on one-way and return tickets right here.
Ontario.£63 per passenger.Departing Mon, 20 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Mon, 20 Jul, arriving in Ontario International.Price includes taxes and charges.From £63, select.
Ontario.£75 per passenger.Departing Mon, 7 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Mon, 7 Sep, arriving in Ontario International.Price includes taxes and charges.From £75, select.
Ontario.£80 per passenger.Departing Tue, 4 Aug.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from San Diego International on Tue, 4 Aug, arriving in Ontario International.Price includes taxes and charges.From £80, select.
Ontario.£92 per passenger.Departing Thu, 8 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Thu, 8 Oct, arriving in Ontario International.Price includes taxes and charges.From £92, select.
Ontario.£97 per passenger.Departing Fri, 6 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Fri, 6 Nov, arriving in Ontario International.Price includes taxes and charges.From £97, select.
Ontario.£119 per passenger.Departing Sat, 27 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Sat, 27 Jun, arriving in Ontario International.Price includes taxes and charges.From £119, select.
Ontario.£167 per passenger.Departing Tue, 1 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Diego International on Tue, 1 Dec, arriving in Ontario International.Price includes taxes and charges.From £167, select.
Ontario.£168 per passenger.Departing Fri, 1 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Diego International on Fri, 1 Jan, arriving in Ontario International.Price includes taxes and charges.From £168, select.
Ontario.£197 per passenger.Departing Fri, 5 Feb.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from San Diego International on Fri, 5 Feb, arriving in Ontario International.Price includes taxes and charges.From £197, select.
Ontario.£205 per passenger.Departing Sat, 27 Mar.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from San Diego International on Sat, 27 Mar, arriving in Ontario International.Price includes taxes and charges.From £205, select.

Find the cheapest month to fly from San Diego 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 Diego International to Ontario International flights are currently cheapest in July.
Jun
from £119
Jul
from £63
Aug
from £80
Sep
from £75
Oct
from £92
Nov
from £97
Dec
from £167
Jan
from £168
Feb
from £197
Mar
from £205
Apr
Find prices
May
Find prices

San Diego International to Ontario International: Alternative routes

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

Ontario International

2 miles from central Ontario
Closest
from £63
Search flights

San Bernardino Norton AFB

24 miles from central Ontario
Search flights

Santa Ana John Wayne

30 miles from central Ontario
from £45
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Long Beach Municipal

33 miles from central Ontario
from £359
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Hawthorne

40 miles from central Ontario
from £209
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Burbank

42 miles from central Ontario
from £86
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Los Angeles International

44 miles from central Ontario
Cheapest
from £36
Search flights

San Diego to Ontario: Flight information

The things to know before you go.
Cheapest flight found£63
Cheapest month to flyJuly

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

The best price we found for a return flight from San Diego International to Ontario International is £94. 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.
Currently, there are no airlines that fly direct from San Diego International to Ontario International. But we found flights with one or more stops from £93.
As of June 2026, there are no flights flying from San Diego International to Ontario International.
The cheapest month to fly from San Diego International to Ontario International is usually July.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Diego International Airport to Ontario International Airport on Wednesday, 1 July 2026.
No airlines currently offer direct flights between San Diego International Airport and Ontario International Airport. Most routes have one or more stops.
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.

Flying from San Diego International Airport (SAN) to Ontario International Airport (ONT): what you need to know

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

  • For a smooth journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This ensures you have enough time to board your SAN to ONT flight.

  • Be prepared for longer queues in popular months such as July. Arriving up to four hours ahead of an international flight and two hours for domestic departures is a good idea.

  • If you want to include a stop along the way, simply uncheck 'Direct flights only' when searching for your ticket from San Diego International Airport to Ontario International Airport. These are the top stopovers between SAN and ONT:

    • Harry Reid Airport (formerly McCarran Airport)

    • Phoenix Sky Harbour International Airport

    • Norman Y. Mineta San Jose International Airport

How to find the cheapest flights from San Diego International Airport (SAN) to Ontario International Airport (ONT)

  • Currently, £63 is the lowest price we've seen for a one-way San Diego International Airport to Ontario International Airport flight. The best price for a return plane ticket is £93. Bear in mind that fares can change due to availability when booking.

  • It's usually smart to book early if you want to find cheap tickets from SAN to ONT. That's because flight prices are based on demand, which tends to rise closer to departure.

  • The 'Whole month' tool shows you the cheapest flights from San Diego International Airport to Ontario International Airport across the month. It's an easy way to snap up a bargain if your plans are flexible.

  • You won't have to check back in every day to see if fares have gone down when you set up a Price Alert. We'll let you know the moment the price changes on cheap flights from SAN to ONT.

  • Tailor your flights using filters. Select your preferred arrival and departure times, total journey duration and airlines. You can also sort results by 'Cheapest,' 'Fastest' or 'Best' flights from San Diego International Airport to Ontario International Airport.

Handy information about San Diego International Airport (SAN)

  • SAN's address is Airport Drive.

  • 71.38% of flights that leave from San Diego International Airport land at their destination on schedule.

  • Central San Diego to San Diego International Airport is approximately 3 miles. Depending on traffic, it'll take about 10 minutes to get there if you're driving, catching a cab or ride-sharing.

  • The trip when using public transport usually takes 20 minutes.

  • Get your journey off to a hassle-free start by staying near SAN. Whether you're boarding an early flight from San Diego International Airport to Ontario International Airport or want to avoid feeling rushed, these stays are perfect:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • The address for ONT is 2900 E. Airport Drive.

  • From Ontario International Airport, Ontario is approximately 4 miles away. It takes around 10 minutes to reach the centre driving.

  • It'll take around 1 hour 30 minutes to get there using public transport.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from San Diego International Airport to Ontario International Airport is May, while August is the most popular. Pick the best time to go to Ontario based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • The warmest month in Ontario is August, with the temperature ranging between 15ºC (59ºF) and 35ºC (95ºF). Book your flights from San Diego International Airport to Ontario International Airport in this month if this is the type of weather you like.

  • January has average temperatures of between 4ºC (39ºF) and 23ºC (73ºF). Look for cheap tickets from SAN to ONT sometime around then if you want to travel in cooler conditions.

Explore more of United States

  • You've visited Ontario, now it's time to discover more of United States. Travel about 35 miles west to Los Angeles to tick off its popular sights. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, you'll have a packed itinerary ahead.

  • San Diego is another must-experience destination in United States and is around 95 miles south of Ontario. No trip is complete without a visit to San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Plan the rest of your trip from San Diego to Ontario

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