Find flights
Deals
Insights
When to book
FAQs & Tips

ONT - SAN

Find cheap flights from Ontario to San Diego from $63

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 4/7. 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
0 bags
Sat 4/27
Sat 5/4

Search 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
In the last 7 days travelers have searched 46,342,885 times on KAYAK, and here is why:

Save 20% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Ontario to San Diego

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 and deals for you by selecting your travel dates.
Choose your dates
9:41 pm - 11:27 pmONT-SAN
25h 46m1 stop
10:25 pm - 1:21 pmSAN-ONT
14h 56m1 stop
Sun, Apr 7 - Fri, Apr 12
12:39 pm - 8:21 pmONT-SAN
7h 42m1 stop
9:32 pm - 7:08 amSAN-ONT
9h 36m1 stop
Wed, Apr 24 - Wed, May 1
12:59 am - 8:24 amONT-SAN
7h 25m1 stop
11:37 am - 9:57 pmSAN-ONT
10h 20m1 stop
Tue, Apr 23 - Wed, May 1
12:59 am - 8:24 amONT-SAN
7h 25m1 stop
8:34 am - 5:04 pmSAN-ONT
8h 30m2 stops
$147Frontier
Find Deal
Tue, Apr 23 - Wed, May 1
7:59 pm - 8:50 amONT-SAN
12h 51m1 stop
2:00 pm - 11:59 pmSAN-ONT
9h 59m1 stop
$347Alaska Airlines
Find Deal
Fri, Apr 26 - Fri, May 3
10:45 am - 6:19 pmONT-SAN
7h 34m1 stop
5:20 pm - 11:04 pmSAN-ONT
5h 44m1 stop
$374United Airlines
Find Deal
Sat, Apr 20 - Wed, Apr 24
6:00 am - 12:40 pmONT-SAN
6h 40m1 stop
6:15 am - 4:05 pmSAN-ONT
9h 50m1 stop
$382Alaska Airlines
Find Deal
Sat, Apr 27 - Sat, May 4
6:00 am - 10:32 amONT-SAN
4h 32m1 stop
1:50 pm - 11:04 pmSAN-ONT
9h 14m1 stop
$404United Airlines
Find Deal
Wed, Apr 24 - Wed, May 1
10:00 am - 3:26 pmONT-SAN
5h 26m1 stop
12:45 pm - 10:29 pmSAN-ONT
9h 44m1 stop
$834American Airlines
Find Deal
Fri, May 3 - Mon, May 6
10:00 am - 3:26 pmONT-SAN
5h 26m1 stop
6:20 am - 11:50 amSAN-ONT
5h 30m1 stop
$866American Airlines
Find Deal
Thu, Apr 11 - Tue, Apr 16

Flights from Ontario to San Diego - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to San Diego to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to San Diego?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to San Diego, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Ontario to San Diego is July, where tickets cost $178 on average. On the other hand, the most expensive months are June and February, where the average cost of tickets is $248 and $227 respectively.

How far in advance should I book a flight from Ontario to San Diego?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to San Diego, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to San Diego, you should book around 5 days before departure. For the absolute cheapest price, our data suggests you should book 66 days before departure.

Which airlines provide the cheapest flights from Ontario to San Diego?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the cheapest one-way ticket from Ontario to San Diego found on KAYAK was with Frontier for $101. Frontier proposed a round-trip connection from $147 and Alaska Airlines from $347.

How long does a flight from Ontario to San Diego take?

Flying between San Diego and Ontario will take minimum 4h 12m and will require at least one stop.

Good to know

Low season

August

High season

August

Cheapest flight

$63
Best time to beat the crowds with an average 79% drop in price.
Most popular time to fly and prices are also 79% lower on average.
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 $63 for a one-way ticket and $112 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.

  • Which airline alliances offer flights from Ontario to San Diego?

    Star Alliance, and oneworld are the airline alliances operating flights between Ontario and San Diego, with oneworld being the most commonly used for this 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.

See more FAQs

Book cheap flights from Ontario to San Diego

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to San Diego found on KAYAK in the last 72 hours.
4/7Sun
1 stop
25h 46mONT-SAN
$63
4/2Tue
1 stop
23h 24mONT-SAN
$68
4/1Mon
1 stopFrontier
19h 11mONT-SAN
$101
3/31Sun
1 stopFrontier
26h 33mONT-SAN
$111
5/1Wed
1 stopUnited Airlines
6h 47mONT-SAN
$153
5/2Thu
1 stopAlaska Airlines
6h 58mONT-SAN
$181
6/25Tue
1 stopUnited Airlines
10h 09mONT-SAN
$189
5/10Fri
1 stopAlaska Airlines
16h 09mONT-SAN
$207
4/4Thu
1 stopAmerican Airlines
5h 01mONT-SAN
$447
4/4Thu
1 stopAmerican Airlines
5h 26mONT-SAN
$462

Search by stops

Search by airline

Search by price

Last minute flights from Ontario to San Diego

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to San Diego that are departing in the next 10 days.
4/1Mon
multi-stop
19h 11mONT-SAN
4/2Tue
multi-stop
9h 42mSAN-ONT
$206
4/1Mon
multi-stopFrontier
4h 40mONT-SAN
4/2Tue
multi-stopFrontier
11h 05mSAN-ONT
$295
3/31Sun
multi-stop
7h 18mONT-SAN
4/2Tue
multi-stop
9h 42mSAN-ONT
$437
3/31Sun
multi-stopFrontier
7h 18mONT-SAN
4/2Tue
multi-stopFrontier
11h 05mSAN-ONT
$512
3/30Sat
multi-stopAlaska Airlines
9h 18mONT-SAN
5/3Fri
multi-stopAlaska Airlines
7h 59mSAN-ONT
$822
3/30Sat
multi-stopUnited Airlines
7h 51mONT-SAN
4/2Tue
multi-stopUnited Airlines
5h 44mSAN-ONT
$905
4/1Mon
multi-stopAmerican Airlines
8h 49mONT-SAN
4/4Thu
multi-stopAmerican Airlines
5h 21mSAN-ONT
$973
3/29Fri
multi-stopAmerican Airlines
8h 49mONT-SAN
3/29Fri
multi-stopAmerican Airlines
16h 24mSAN-ONT
$1,002
3/31Sun
multi-stopAmerican Airlines
5h 03mONT-SAN
4/6Sat
multi-stopAmerican Airlines
5h 21mSAN-ONT
$1,014
3/31Sun
multi-stopAmerican Airlines
8h 55mONT-SAN
4/1Mon
multi-stopAmerican Airlines
8h 56mSAN-ONT
$1,024

Search by stops

Search by airline

Search by price

Ontario - San Diego Flights

Departure:

Ontario (ONT)United States

Destination:

San Diego (SAN)United States

Return flight deals:

San Diego - Ontario

Cabin classes: