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Cheap flights from Ontario to San Diego from $66

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 3/25. 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
10:03 pm - 5:38 pm
ONT
-
SAN
19h 35m
1 stop
Frontier Logo
2:08 pm - 9:03 pm
SAN
-
ONT
6h 55m
1 stop
$125Frontier
Wed, Mar 11 - Wed, Mar 25
Frontier Logo
11:17 am - 4:13 pm
ONT
-
SAN
4h 56m
1 stop
Frontier Logo
9:58 pm - 1:28 pm
SAN
-
ONT
15h 30m
1 stop
$127Frontier
Mon, Mar 23 - Mon, Mar 30
Frontier Logo
3:30 pm - 1:13 pm
ONT
-
SAN
21h 43m
1 stop
Frontier Logo
9:58 pm - 1:28 pm
SAN
-
ONT
15h 30m
1 stop
$130Frontier
Mon, Mar 23 - Mon, Mar 30
Frontier Logo
1:55 pm - 4:13 pm
ONT
-
SAN
26h 18m
1 stop
Frontier Logo
9:59 pm - 8:06 am
SAN
-
ONT
10h 07m
1 stop
$145Frontier
Sun, Mar 22 - Sun, Mar 29
Frontier Logo
2:23 pm - 5:38 pm
ONT
-
SAN
27h 15m
1 stop
Frontier Logo
6:25 am - 11:56 pm
SAN
-
ONT
17h 31m
1 stop
$148Frontier
Wed, Mar 25 - Wed, Apr 1
Frontier Logo
10:03 pm - 5:38 pm
ONT
-
SAN
19h 35m
1 stop
Frontier Logo
2:50 pm - 8:06 am
SAN
-
ONT
41h 16m
2 stops
$152Frontier
Wed, Mar 11 - Wed, Mar 25
Frontier Logo
3:30 pm - 2:05 pm
ONT
-
SAN
22h 35m
2 stops
Frontier Logo
9:58 pm - 1:28 pm
SAN
-
ONT
15h 30m
1 stop
$154Frontier
Mon, Mar 23 - Mon, Mar 30
Frontier Logo
6:15 am - 12:08 am
ONT
-
SAN
17h 53m
1 stop
Frontier Logo
9:59 pm - 8:06 am
SAN
-
ONT
10h 07m
1 stop
$162Frontier
Wed, Mar 25 - Thu, Mar 26
Frontier Logo
10:57 am - 1:13 pm
ONT
-
SAN
26h 16m
1 stop
Frontier Logo
9:58 pm - 1:28 pm
SAN
-
ONT
15h 30m
1 stop
$181Frontier
Mon, Mar 9 - Fri, Mar 13
Alaska Airlines Logo
6:00 am - 6:39 pm
ONT
-
SAN
12h 39m
1 stop
Alaska Airlines Logo
8:35 pm - 9:45 am
SAN
-
ONT
13h 10m
1 stop
$187Alaska Airlines
Tue, Apr 21 - Mon, Apr 27

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
Apr 21
ONT6:00 amOntario
12h 39m
1 stop
SAN6:39 pmSan Diego
Apr 27
SAN8:35 pmSan Diego
13h 10m
1 stop
ONT9:45 amOntario
$187
Alaska Airlines
May 7
ONT3:26 pmOntario
8h 33m
1 stop
SAN11:59 pmSan Diego
May 11
SAN6:34 pmSan Diego
15h 11m
1 stop
ONT9:45 amOntario
$223
Alaska Airlines
Apr 16
ONT4:22 pmOntario
5h 07m
1 stop
SAN9:29 pmSan Diego
Apr 20
SAN9:14 pmSan Diego
18h 28m
1 stop
ONT3:42 pmOntario
$233

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Mar 11
ONT10:03 pmOntario
19h 35m
1 stop
SAN5:38 pmSan Diego
Mar 25
SAN2:08 pmSan Diego
6h 55m
1 stop
ONT9:03 pmOntario
$125
Frontier
Mar 23
ONT11:17 amOntario
4h 56m
1 stop
SAN4:13 pmSan Diego
Mar 30
SAN9:58 pmSan Diego
15h 30m
1 stop
ONT1:28 pmOntario
$127
Frontier
Mar 23
ONT3:30 pmOntario
21h 43m
1 stop
SAN1:13 pmSan Diego
Mar 30
SAN9:58 pmSan Diego
15h 30m
1 stop
ONT1:28 pmOntario
$130

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 February 25, 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

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 3/11

10:03 pm-5:38 pm

1 stop19h 35m

San Diego

Wed 3/25

2:08 pm-9:03 pm

1 stop6h 55m

$125

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 3/23

11:17 am-4:13 pm

1 stop4h 56m

San Diego

Mon 3/30

9:58 pm-1:28 pm

1 stop15h 30m

$127

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 3/23

3:30 pm-1:13 pm

1 stop21h 43m

San Diego

Mon 3/30

9:58 pm-1:28 pm

1 stop15h 30m

$130

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 3/22

1:55 pm-4:13 pm

1 stop26h 18m

San Diego

Sun 3/29

9:59 pm-8:06 am

1 stop10h 07m

$145

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 3/25

2:23 pm-5:38 pm

1 stop27h 15m

San Diego

Wed 4/1

6:25 am-11:56 pm

1 stop17h 31m

$148

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 3/11

10:03 pm-5:38 pm

1 stop19h 35m

San Diego

Wed 3/25

2:50 pm-8:06 am

2 stops41h 16m

$152

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 3/23

3:30 pm-2:05 pm

2 stops22h 35m

San Diego

Mon 3/30

9:58 pm-1:28 pm

1 stop15h 30m

$154

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 3/25

6:15 am-12:08 am

1 stop17h 53m

San Diego

Thu 3/26

9:59 pm-8:06 am

1 stop10h 07m

$162

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 3/9

10:57 am-1:13 pm

1 stop26h 16m

San Diego

Fri 3/13

9:58 pm-1:28 pm

1 stop15h 30m

$181

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 4/21

6:00 am-6:39 pm

1 stop12h 39m

San Diego

Mon 4/27

8:35 pm-9:45 am

1 stop13h 10m

$187

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 Tuesday. Travelers who choose to depart for San Diego on a Tuesday will often find tickets for as low as $184. 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 $211. Flights in the afternoon are often more expensive with an average ticket price of $289.

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 30m

Direct flights

None
The fastest flight from Ontario to San Diego takes 3h 30m
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 30m.

  • 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
Poway
National City
Imperial Beach
San Ysidro
Borrego Springs
La Mesa
Alpine
Lemon Grove
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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