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Cheap flights from Ontario to San Diego from $62

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Diego departing on 8/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Ontario to San Diego

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:40 pm - 2:08 pm
ONT
-
SAN
22h 28m
1 stop
Frontier Logo
7:46 pm - 12:53 pm
SAN
-
ONT
17h 07m
1 stop
$122Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
3:40 pm - 2:08 pm
ONT
-
SAN
22h 28m
1 stop
Frontier Logo
7:46 pm - 12:53 pm
SAN
-
ONT
17h 07m
1 stop
$128Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
1:38 pm - 2:08 pm
ONT
-
SAN
24h 30m
1 stop
Frontier Logo
3:03 pm - 8:03 am
SAN
-
ONT
17h 00m
1 stop
$134Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
1:38 pm - 2:08 pm
ONT
-
SAN
24h 30m
1 stop
Frontier Logo
4:12 pm - 8:03 am
SAN
-
ONT
15h 51m
2 stops
$145Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
1:38 pm - 2:08 pm
ONT
-
SAN
24h 30m
1 stop
Frontier Logo
4:12 pm - 8:03 am
SAN
-
ONT
15h 51m
2 stops
$153Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
3:34 pm - 8:58 pm
ONT
-
SAN
5h 24m
1 stop
Frontier Logo
6:25 am - 10:05 am
SAN
-
ONT
27h 40m
1 stop
$174Frontier
Wed, Aug 26 - Sun, Aug 30
Frontier Logo
2:58 pm - 9:02 am
ONT
-
SAN
18h 04m
2 stops
Frontier Logo
6:25 am - 1:57 pm
SAN
-
ONT
7h 32m
1 stop
$181Frontier
Wed, Sep 16 - Sat, Sep 19
Frontier Logo
9:49 pm - 12:25 pm
ONT
-
SAN
14h 36m
1 stop
Frontier Logo
6:25 am - 1:57 pm
SAN
-
ONT
7h 32m
1 stop
$189Frontier
Wed, Sep 16 - Sat, Sep 19
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
7:46 pm - 12:53 pm
SAN
-
ONT
17h 07m
1 stop
$206Frontier
Thu, Jul 9 - Mon, Jul 13
Frontier Logo
8:36 pm - 12:15 am
ONT
-
SAN
27h 39m
1 stop
Frontier Logo
8:51 pm - 8:03 am
SAN
-
ONT
11h 12m
1 stop
$207Frontier
Mon, Jun 29 - Mon, Jul 6

American Airlines flights from Ontario to San Diego

Our best American Airlines deals on Ontario to San Diego flight tickets
American Airlines
Jul 1
ONT6:10 amOntario
9h 17m
1 stop
SAN3:27 pmSan Diego
Jul 8
SAN9:41 amSan Diego
8h 37m
1 stop
ONT6:18 pmOntario
$263
American Airlines
Jul 30
ONT1:11 pmOntario
8h 23m
1 stop
SAN9:34 pmSan Diego
Aug 4
SAN9:41 amSan Diego
8h 37m
1 stop
ONT6:18 pmOntario
$293
American Airlines
Jul 30
ONT1:11 pmOntario
8h 23m
1 stop
SAN9:34 pmSan Diego
Aug 4
SAN9:41 amSan Diego
8h 37m
1 stop
ONT6:18 pmOntario
$364

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Jul 7
ONT3:40 pmOntario
22h 28m
1 stop
SAN2:08 pmSan Diego
Jul 14
SAN7:46 pmSan Diego
17h 07m
1 stop
ONT12:53 pmOntario
$122
Frontier
Jul 7
ONT3:40 pmOntario
22h 28m
1 stop
SAN2:08 pmSan Diego
Jul 14
SAN7:46 pmSan Diego
17h 07m
1 stop
ONT12:53 pmOntario
$128
Frontier
Jul 7
ONT1:38 pmOntario
24h 30m
1 stop
SAN2:08 pmSan Diego
Jul 14
SAN3:03 pmSan Diego
17h 00m
1 stop
ONT8:03 amOntario
$134

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 4, 2026.
Use the filters below to find and compare flights from Ontario to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

3:40 pm-2:08 pm

1 stop22h 28m

San Diego

Tue 7/14

7:46 pm-12:53 pm

1 stop17h 07m

$122

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

3:40 pm-2:08 pm

1 stop22h 28m

San Diego

Tue 7/14

7:46 pm-12:53 pm

1 stop17h 07m

$128

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

1:38 pm-2:08 pm

1 stop24h 30m

San Diego

Tue 7/14

3:03 pm-8:03 am

1 stop17h 00m

$134

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

1:38 pm-2:08 pm

1 stop24h 30m

San Diego

Tue 7/14

4:12 pm-8:03 am

2 stops15h 51m

$145

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

1:38 pm-2:08 pm

1 stop24h 30m

San Diego

Tue 7/14

4:12 pm-8:03 am

2 stops15h 51m

$153

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 8/26

3:34 pm-8:58 pm

1 stop5h 24m

San Diego

Sun 8/30

6:25 am-10:05 am

1 stop27h 40m

$174

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 9/16

2:58 pm-9:02 am

2 stops18h 04m

San Diego

Sat 9/19

6:25 am-1:57 pm

1 stop7h 32m

$181
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 9/16

9:49 pm-12:25 pm

1 stop14h 36m

San Diego

Sat 9/19

6:25 am-1:57 pm

1 stop7h 32m

$189

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 7/9

8:58 am-12:04 am

1 stop15h 06m

San Diego

Mon 7/13

7:46 pm-12:53 pm

1 stop17h 07m

$206

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/29

8:36 pm-12:15 am

1 stop27h 39m

San Diego

Mon 7/6

8:51 pm-8:03 am

1 stop11h 12m

$207

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Diego from

How to get the cheapest flight ticket from Ontario to San Diego

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to San Diego?

The cheapest day to depart from Ontario to San Diego is on a Thursday. Travelers who choose to depart for San Diego on a Thursday will often find tickets for as low as $239. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $457. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

What is the cheapest time of day to depart on your flight to San Diego?

The cheapest time of day to fly to San Diego is in the morning when flights can be purchased for as low as $239. Flights at noon are often more expensive with an average ticket price of $309.

When to book flights from Ontario to San Diego

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to San Diego according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to San Diego (ONT to SAN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San Diego

Fastest flight time

3h 10m

Direct flights

None
The fastest flight from Ontario to San Diego takes 3h 10m
There are no direct flights from Ontario to San Diego. There are no popular flight routes from Ontario to San Diego.
Search flight deals

Frequently asked questions about flying from Ontario to San Diego

  • How far is Ontario to San Diego by plane?

    A flight from Ontario to San Diego will travel around 97.3 mi. By plane, this route typically takes 3h 10m.

  • When did momondo last update prices for flights from Ontario Airport to San Diego Airport?

    Prices for flights from Ontario Airport to San Diego Airport are updated daily.

  • How old do you have to be to fly from Ontario Airport to San Diego Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Diego Airport.

  • What documentation or ID do you need to fly to San Diego Airport?

    The necessary travel and health documents for your San Diego Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Chula Vista
Coronado
El Cajon
Julian
National City
Poway
San Ysidro
La Mesa
Borrego Springs
Lemon Grove
Imperial Beach
Alpine
Santee

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San Diego?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to San Diego. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to San Diego with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to San Diego flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to San Diego?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Diego from Ontario.

I’m not ready to book a flight from Ontario to San Diego right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to San Diego flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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