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Cheap flights from Ontario to San Diego from $132

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 5/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
12:59 am - 11:06 pm
ONT
-
SAN
22h 07m
1 stop
Frontier Logo
7:15 am - 11:55 pm
SAN
-
ONT
16h 40m
1 stop
$152Frontier
Fri, Apr 24 - Sat, May 2
Frontier Logo
12:59 am - 8:04 pm
ONT
-
SAN
19h 05m
1 stop
Frontier Logo
10:07 pm - 3:44 pm
SAN
-
ONT
17h 37m
1 stop
$160Frontier
Fri, Apr 24 - Mon, May 25
Frontier Logo
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
10:07 pm - 3:09 pm
SAN
-
ONT
17h 02m
1 stop
$161Frontier
Mon, Jun 1 - Thu, Jun 4
Frontier Logo
5:33 pm - 8:04 pm
ONT
-
SAN
26h 31m
1 stop
Frontier Logo
9:00 pm - 3:44 pm
SAN
-
ONT
18h 44m
1 stop
$162Frontier
Mon, Apr 27 - Mon, May 4
Frontier Logo
12:59 am - 8:04 pm
ONT
-
SAN
19h 05m
1 stop
Frontier Logo
2:12 pm - 6:49 pm
SAN
-
ONT
4h 37m
1 stop
$173Frontier
Mon, Apr 27 - Wed, Apr 29
Frontier Logo
12:59 am - 8:04 pm
ONT
-
SAN
19h 05m
1 stop
Frontier Logo
7:15 am - 6:49 pm
SAN
-
ONT
11h 34m
2 stops
$180Frontier
Fri, Apr 24 - Sat, May 2
Frontier Logo
11:47 am - 5:52 pm
ONT
-
SAN
6h 05m
1 stop
Frontier Logo
8:00 am - 11:55 pm
SAN
-
ONT
15h 55m
1 stop
$184Frontier
Thu, Apr 23 - Wed, Apr 29
Frontier Logo
5:33 pm - 11:59 pm
ONT
-
SAN
6h 26m
1 stop
Frontier Logo
12:25 pm - 7:31 am
SAN
-
ONT
19h 06m
1 stop
$186Frontier
Thu, Apr 23 - Thu, Apr 30
Frontier Logo
5:33 pm - 11:59 pm
ONT
-
SAN
6h 26m
1 stop
Frontier Logo
12:25 pm - 11:22 am
SAN
-
ONT
22h 57m
2 stops
$187Frontier
Thu, Apr 23 - Thu, Apr 30
Frontier Logo
12:59 am - 2:24 pm
ONT
-
SAN
13h 25m
2 stops
Frontier Logo
10:07 pm - 3:44 pm
SAN
-
ONT
17h 37m
1 stop
$191Frontier
Fri, Apr 24 - Mon, May 25

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
Apr 28
ONT12:48 pmOntario
20h 22m
1 stop
SAN9:10 amSan Diego
Apr 29
SAN5:17 pmSan Diego
18h 51m
1 stop
ONT12:08 pmOntario
$302
Alaska Airlines
Apr 21
ONT4:22 pmOntario
5h 07m
1 stop
SAN9:29 pmSan Diego
Apr 22
SAN5:17 pmSan Diego
18h 51m
1 stop
ONT12:08 pmOntario
$328
Alaska Airlines
May 12
ONT12:48 pmOntario
20h 02m
1 stop
SAN8:50 amSan Diego
May 16
SAN9:27 amSan Diego
9h 41m
1 stop
ONT7:08 pmOntario
$343

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Apr 24
ONT12:59 amOntario
22h 07m
1 stop
SAN11:06 pmSan Diego
May 2
SAN7:15 amSan Diego
16h 40m
1 stop
ONT11:55 pmOntario
$152
Frontier
Apr 24
ONT12:59 amOntario
19h 05m
1 stop
SAN8:04 pmSan Diego
May 25
SAN10:07 pmSan Diego
17h 37m
1 stop
ONT3:44 pmOntario
$160
Frontier
Jun 1
ONT6:00 amOntario
17h 50m
1 stop
SAN11:50 pmSan Diego
Jun 4
SAN10:07 pmSan Diego
17h 02m
1 stop
ONT3:09 pmOntario
$161

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 March 30, 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

Fri 4/24

12:59 am-11:06 pm

1 stop22h 07m

San Diego

Sat 5/2

7:15 am-11:55 pm

1 stop16h 40m

$152

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 4/24

12:59 am-8:04 pm

1 stop19h 05m

San Diego

Mon 5/25

10:07 pm-3:44 pm

1 stop17h 37m

$160

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/1

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Thu 6/4

10:07 pm-3:09 pm

1 stop17h 02m

$161

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 4/27

5:33 pm-8:04 pm

1 stop26h 31m

San Diego

Mon 5/4

9:00 pm-3:44 pm

1 stop18h 44m

$162

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 4/27

12:59 am-8:04 pm

1 stop19h 05m

San Diego

Wed 4/29

2:12 pm-6:49 pm

1 stop4h 37m

$173

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 4/24

12:59 am-8:04 pm

1 stop19h 05m

San Diego

Sat 5/2

7:15 am-6:49 pm

2 stops11h 34m

$180
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 4/23

11:47 am-5:52 pm

1 stop6h 05m

San Diego

Wed 4/29

8:00 am-11:55 pm

1 stop15h 55m

$184

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 4/23

5:33 pm-11:59 pm

1 stop6h 26m

San Diego

Thu 4/30

12:25 pm-7:31 am

1 stop19h 06m

$186

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 4/23

5:33 pm-11:59 pm

1 stop6h 26m

San Diego

Thu 4/30

12:25 pm-11:22 am

2 stops22h 57m

$187

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 4/24

12:59 am-2:24 pm

2 stops13h 25m

San Diego

Mon 5/25

10:07 pm-3:44 pm

1 stop17h 37m

$191

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 $189. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $447. 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 $224. Flights in the afternoon are often more expensive with an average ticket price of $278.

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 40m

Direct flights

None
The fastest flight from Ontario to San Diego takes 3h 40m
There are no direct flights from Ontario to San Diego. There are no popular flight routes from Ontario to San Diego.
Search flight deals

  • 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 40m.

  • 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
Coronado
Chula Vista
El Cajon
Julian
National City
Poway
San Ysidro
La Mesa
Imperial Beach
Borrego Springs
Alpine
Santee
Lemon Grove

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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