ONT - SAN

$45 Find Cheap Flights from Ontario to San Diego

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 Diego departing on 8/8. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Diego, 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 Diego, as well as popular online travel agencies
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Flights Deals

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

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

Mon, Aug 18 - Tue, Aug 19
Frontier Logo
6:00 am - 12:08 pmONT-SAN
6h 08m1 stop
Frontier Logo
8:00 am - 4:18 pmSAN-ONT
8h 18m1 stop
$126Frontier
Find Deal
Sun, Jul 27 - Sun, Aug 3
Frontier Logo
6:00 am - 12:04 pmONT-SAN
6h 04m1 stop
Frontier Logo
12:59 pm - 8:52 pmSAN-ONT
7h 53m1 stop
$131Frontier
Find Deal
Wed, Oct 29 - Tue, Nov 4
Frontier Logo
12:47 pm - 9:20 pmONT-SAN
8h 33m1 stop
Frontier Logo
8:00 am - 11:47 amSAN-ONT
3h 47m1 stop
$162Frontier
Find Deal
Sun, Sep 14 - Wed, Sep 17
Frontier Logo
10:23 pm - 11:38 amONT-SAN
13h 15m1 stop
Frontier Logo
8:00 am - 9:56 pmSAN-ONT
13h 56m1 stop
$163Frontier
Find Deal
Sun, Sep 21 - Wed, Sep 24
Frontier Logo
7:30 pm - 11:38 amONT-SAN
16h 08m1 stop
Frontier Logo
8:00 am - 9:56 pmSAN-ONT
13h 56m1 stop
$171Frontier
Find Deal
Thu, Aug 14 - Wed, Aug 20
Frontier Logo
6:00 am - 12:08 pmONT-SAN
6h 08m1 stop
Frontier Logo
8:00 am - 4:18 pmSAN-ONT
8h 18m1 stop
$172Frontier
Find Deal
Mon, Aug 25 - Wed, Sep 10
Frontier Logo
6:00 am - 11:03 pmONT-SAN
17h 03m1 stop
Frontier Logo
8:00 am - 9:56 pmSAN-ONT
13h 56m1 stop
$173Frontier
Find Deal
Sun, Aug 17 - Tue, Aug 19
Frontier Logo
12:59 am - 9:52 amONT-SAN
8h 53m1 stop
Frontier Logo
8:00 am - 4:18 pmSAN-ONT
8h 18m1 stop
$177Frontier
Find Deal
Fri, Sep 19 - Mon, Sep 29
Frontier Logo
6:00 am - 11:38 amONT-SAN
5h 38m1 stop
Frontier Logo
11:18 am - 11:38 pmSAN-ONT
12h 20m1 stop
$182Frontier
Find Deal
Tue, Jul 29 - Thu, Jul 31
Frontier Logo
7:00 am - 6:19 pmONT-SAN
11h 19m1 stop
Frontier Logo
7:04 pm - 11:53 amSAN-ONT
16h 49m1 stop
$185Frontier
Find Deal
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Good to know

Cheapest flight$45
Flight from Ontario to San Diego

When to book flights from Ontario to San Diego

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

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

    In the last 3 days, the lowest price for a flight from Ontario to San Diego was $45 for a one-way ticket and $126 for a round-trip.

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

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

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

    We unfortunately don’t have that data for this specific route.

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

    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 Diego.

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

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

    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 Diego with an airline and back to Ontario with another airline. Booking your flights between Ontario and SAN 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 Diego?

    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 Diego from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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

Information on your arrival and departure airports

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