Cheap flights from Ontario to San Diego

Flights overview

Useful information for finding cheap flights from Ontario to San Diego and booking your next trip
Cheapest round-trip flights $304
United 1 stop 15 hr Sat, Jun 6 — Mon, Jun 8
The cheapest round-trip flight from Ontario to San Diego is currently $304
Cheapest one-way flight $137
American 1 stop 10 hr Wed, May 27
The cheapest one-way flight from Ontario to San Diego is currently $137
Last-minute weekend getaway $747
Southwest 1 stop 4 hr Thu, May 7 — Sun, May 10
The cheapest last-minute weekend getaway from Ontario to San Diego is currently $747
Cheapest business class flights $753
Alaska 1 stop 25 hr Thu, Jul 23 — Sun, Jul 26
The cheapest business class round-trip flight from Ontario to San Diego is currently $753
Fastest flight 2 hr 55 min The fastest flight with stops from Ontario to San Diego takes 2 hr 55 min
Nonstop flights None There are no direct flights on this route.

When is the cheapest time to fly?

The cheapest month to fly from Ontario to San Diego is typically September. The most expensive month to fly is typically March.
September
Cheapest
Typical prices: $140–260
March
Most expensive
Typical prices: $290–610

Popular airlines from Ontario to San Diego

  • Southwest
    from $353
    Typical price: $270–580
    1651 weekly connecting flights
    ONT - SAN Every day
  • United
    from $318
    Typical price: $280–580
    175 weekly connecting flights
    ONT - SAN Every day
  • American
    from $313
    Typical price: $295–750
    170 weekly connecting flights
    ONT - SAN Every day
  • Alaska
    from $417
    Typical price: $370–840
    105 weekly connecting flights
    ONT - SAN Every day
  • Frontier
    Typical price: $150–280
    26 weekly connecting flights
    ONT - SAN Every day

Popular airports near Ontario

  • Ontario International Airport (ONT)
    Ontario United States 11 min 2 mi
  • Los Angeles International Airport (LAX)
    Los Angeles United States 1 hr 7 min 44 mi
  • Tijuana International Airport (TIJ)
    Tijuana Mexico 2 hr 16 min 112 mi
  • San Diego International Airport (SAN)
    San Diego United States 1 hr 50 min 95 mi

Popular airports near San Diego

  • San Diego International Airport (SAN)
    San Diego United States 10 min 2 mi
  • Tijuana International Airport (TIJ)
    Tijuana Mexico 37 min 16 mi
  • Los Angeles International Airport (LAX)
    Los Angeles United States 2 hr 2 min 111 mi
  • John Wayne Airport (SNA)
    Santa Ana United States 1 hr 21 min 78 mi

Frequently asked questions about flying from Ontario to San Diego

The cheapest flights from Ontario to San Diego are usually in September. Typical ticket prices in September range from $140 to $260.
The cheapest round-trip flight from Ontario to San Diego recently found on Google Flights was with United from $304. The cheapest one-way flight was with American from $137.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from Ontario to San Diego is $353, flying from May 28 to Jun 1.
  • The cheapest United flight from Ontario to San Diego is $318, flying from Jun 4 to Jun 8.
  • The cheapest American flight from Ontario to San Diego is $313, flying from May 30 to Jun 1.
  • The cheapest Alaska flight from Ontario to San Diego is $417, flying from Jun 6 to Jun 8.
The cheapest round-trip flight from Ontario to San Diego starts at $304 from Sat, Jun 6 to Mon, Jun 8. The cheapest one-way flight starts at $137 and departs on Wed, May 27.
2 hr 55 min is the shortest flight time from Ontario to San Diego.
Jun–Aug is when most people visit San Diego, where the weather's temperate year-round. Beaches are less crowded Dec–Feb, which bring cooler temperatures but brighter sun. Whale-watching season is from mid-Dec–mid-Mar. Major annual events include Comic-Con International (Jul), a massive comic book convention with workshops and film screenings. Fleet Week (autumn) is a large military appreciation event featuring Navy ship tours, an air show and more.
It's easy to use Google Flights to find the cheapest days to fly from Ontario to San Diego.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from Ontario to San Diego really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from Ontario to San Diego.

In terms of flights, Southwest is the most popular. Southwest offers 1,651 connecting flights per week. Southwest flies from Ontario International Airport (ONT) to San Diego International Airport (SAN) .

Other popular airlines flying from Ontario to San Diego are:
  • United offers 175 connecting flights per week. United flies from Ontario International Airport (ONT) to San Diego International Airport (SAN) .
  • American offers 170 connecting flights per week. American flies from Ontario International Airport (ONT) to San Diego International Airport (SAN) .
  • Alaska offers 105 connecting flights per week. Alaska flies from Ontario International Airport (ONT) to San Diego International Airport (SAN) .
  • Frontier offers 26 connecting flights per week. Frontier flies from Ontario International Airport (ONT) to San Diego International Airport (SAN) .
The number of connecting flights refers to distinct flights with at least one stop between Ontario and San Diego.
The cheapest round-trip flight from Ontario to San Diego recently found on Google Flights was with United from $304. The cheapest one-way flight was with American from $137.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from Ontario to San Diego is $353, flying from May 28 to Jun 1.
  • The cheapest United flight from Ontario to San Diego is $318, flying from Jun 4 to Jun 8.
  • The cheapest American flight from Ontario to San Diego is $313, flying from May 30 to Jun 1.
  • The cheapest Alaska flight from Ontario to San Diego is $417, flying from Jun 6 to Jun 8.
No airline flies direct from Ontario to San Diego.
  • There are 1651 Southwest connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 175 United connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 170 American connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 105 Alaska connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 26 Frontier connecting flights from Ontario to San Diego per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between Ontario and San Diego at price $747 is offered by Southwest from Thu, May 7 to Sun, May 10.
No airline flies direct from Ontario to San Diego.
  • There are 1651 Southwest connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 175 United connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 170 American connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 105 Alaska connecting flights from Ontario to San Diego per week. Flights are available every day.
  • There are 26 Frontier connecting flights from Ontario to San Diego per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are no direct flights from Ontario to San Diego.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Ontario to San Diego, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between Ontario and San Diego start at $753 from Thu, Jul 23 to Sun, Jul 26 with Alaska.
The cheapest economy class round-trip flights between Ontario and San Diego start at $304 from Sat, Jun 6 to Mon, Jun 8.
To book business class trips from Ontario to San Diego, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between Ontario and San Diego starts at $747 from Thu, May 7 to Sun, May 10 with Southwest.
The cheapest last-minute deal between Ontario and San Diego at price $747 is offered by Southwest from Thu, May 7 to Sun, May 10.
To find last-minute flight deals from Ontario to San Diego, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

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