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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 7/21. 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

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
$128Frontier
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
8:33 pm - 11:49 pm
ONT
-
SAN
27h 16m
1 stop
Frontier Logo
9:53 pm - 4:10 pm
SAN
-
ONT
18h 17m
1 stop
$170Frontier
Tue, Sep 1 - Tue, Sep 8
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
$179Frontier
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
$190Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
3:40 pm - 2:08 pm
ONT
-
SAN
22h 28m
1 stop
Frontier Logo
3:03 pm - 8:03 am
SAN
-
ONT
17h 00m
1 stop
$191Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
3:40 pm - 3:43 pm
ONT
-
SAN
24h 03m
2 stops
Frontier Logo
7:46 pm - 12:53 pm
SAN
-
ONT
17h 07m
1 stop
$213Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
7:46 pm - 11:07 am
SAN
-
ONT
15h 21m
1 stop
$232Frontier
Wed, Jul 8 - Wed, Jul 15
Frontier Logo
1:38 pm - 12:04 am
ONT
-
SAN
10h 26m
2 stops
Frontier Logo
3:03 pm - 8:03 am
SAN
-
ONT
17h 00m
1 stop
$233Frontier
Tue, Jul 7 - Tue, Jul 14
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
8:51 pm - 8:03 am
SAN
-
ONT
11h 12m
1 stop
$242Frontier
Wed, Jul 22 - Mon, Jul 27

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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
$128
Frontier
Jul 7
ONT1:38 pmOntario
24h 30m
1 stop
SAN2:08 pmSan Diego
Jul 14
SAN4:12 pmSan Diego
15h 51m
2 stops
ONT8:03 amOntario
$153
Frontier
Sep 1
ONT8:33 pmOntario
27h 16m
1 stop
SAN11:49 pmSan Diego
Sep 8
SAN9:53 pmSan Diego
18h 17m
1 stop
ONT4:10 pmOntario
$170

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
Sep 11
ONT4:27 pmOntario
15h 38m
1 stop
SAN8:05 amSan Diego
Sep 14
SAN9:59 pmSan Diego
17h 48m
1 stop
ONT3:47 pmOntario
$329
Alaska Airlines
Oct 20
ONT5:48 pmOntario
14h 22m
1 stop
SAN8:10 amSan Diego
Oct 21
SAN10:29 amSan Diego
5h 33m
1 stop
ONT4:02 pmOntario
$402
Alaska Airlines
Sep 9
ONT4:27 pmOntario
4h 09m
1 stop
SAN8:36 pmSan Diego
Sep 15
SAN10:45 amSan Diego
5h 25m
1 stop
ONT4:10 pmOntario
$422

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 14, 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

$128

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

Tue 9/1

8:33 pm-11:49 pm

1 stop27h 16m

San Diego

Tue 9/8

9:53 pm-4:10 pm

1 stop18h 17m

$170

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 7/14

7:46 pm-12:53 pm

1 stop17h 07m

$179

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

$190

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

3:40 pm-2:08 pm

1 stop22h 28m

San Diego

Tue 7/14

3:03 pm-8:03 am

1 stop17h 00m

$191

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

3:40 pm-3:43 pm

2 stops24h 03m

San Diego

Tue 7/14

7:46 pm-12:53 pm

1 stop17h 07m

$213

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 7/8

8:58 am-12:04 am

1 stop15h 06m

San Diego

Wed 7/15

7:46 pm-11:07 am

1 stop15h 21m

$232

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 7/7

1:38 pm-12:04 am

2 stops10h 26m

San Diego

Tue 7/14

3:03 pm-8:03 am

1 stop17h 00m

$233
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 7/22

8:58 am-12:04 am

1 stop15h 06m

San Diego

Mon 7/27

8:51 pm-8:03 am

1 stop11h 12m

$242

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 $319.

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

4h 09m

Direct flights

None
The fastest flight from Ontario to San Diego takes 4h 09m
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 4h 09m.

  • 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
La Mesa
San Ysidro
Borrego Springs
Imperial Beach
Lemon Grove
Santee
Alpine

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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