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Cheap flights from Ontario to San Diego from $118

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 11/16. 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
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
7:45 pm - 12:48 pm
SAN
-
ONT
17h 03m
1 stop
$130Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
7:45 pm - 12:48 pm
SAN
-
ONT
17h 03m
1 stop
$131Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
3:03 pm - 3:14 pm
SAN
-
ONT
24h 11m
1 stop
$158Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
4:09 pm - 8:06 pm
ONT
-
SAN
3h 57m
1 stop
Frontier Logo
7:45 pm - 12:48 pm
SAN
-
ONT
17h 03m
1 stop
$162Frontier
Mon, Aug 10 - Tue, Aug 11
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
3:03 pm - 12:48 pm
SAN
-
ONT
21h 45m
2 stops
$166Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
8:58 am - 11:59 pm
ONT
-
SAN
15h 01m
1 stop
Frontier Logo
7:45 pm - 11:02 am
SAN
-
ONT
15h 17m
1 stop
$177Frontier
Thu, Aug 6 - Thu, Aug 13
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
4:28 pm - 3:14 pm
SAN
-
ONT
22h 46m
2 stops
$187Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
8:58 am - 12:04 am
ONT
-
SAN
15h 06m
1 stop
Frontier Logo
4:28 pm - 8:03 am
SAN
-
ONT
15h 35m
2 stops
$192Frontier
Tue, Aug 4 - Tue, Aug 11
Frontier Logo
8:48 am - 2:50 pm
ONT
-
SAN
6h 02m
1 stop
Frontier Logo
6:25 am - 4:22 pm
SAN
-
ONT
9h 57m
2 stops
$193Frontier
Mon, Aug 24 - Thu, Aug 27
Frontier Logo
8:48 am - 2:50 pm
ONT
-
SAN
6h 02m
1 stop
Frontier Logo
10:00 am - 11:02 am
SAN
-
ONT
25h 02m
1 stop
$194Frontier
Fri, Sep 4 - Sun, Sep 6

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American Airlines flights from Ontario to San Diego

Our best American Airlines deals on Ontario to San Diego flight tickets
American Airlines
Aug 4
ONT6:11 amOntario
9h 15m
1 stop
SAN3:26 pmSan Diego
Aug 11
SAN4:22 pmSan Diego
25h 53m
1 stop
ONT6:15 pmOntario
$247
American Airlines
Aug 24
ONT4:07 pmOntario
26h 11m
1 stop
SAN6:18 pmSan Diego
Aug 27
SAN6:25 amSan Diego
8h 54m
1 stop
ONT3:19 pmOntario
$289
American Airlines
Aug 24
ONT4:07 pmOntario
26h 11m
1 stop
SAN6:18 pmSan Diego
Aug 28
SAN6:25 amSan Diego
29h 38m
1 stop
ONT12:03 pmOntario
$297

Southwest flights from Ontario to San Diego

Our best Southwest deals on Ontario to San Diego flight tickets
Southwest
Aug 13
ONT8:30 amOntario
3h 55m
1 stop
SAN12:25 pmSan Diego
Aug 13
SAN2:40 pmSan Diego
5h 15m
1 stop
ONT7:55 pmOntario
$291
Southwest
Jul 26
ONT5:30 amOntario
4h 35m
1 stop
SAN10:05 amSan Diego
Jul 26
SAN5:00 pmSan Diego
4h 40m
1 stop
ONT9:40 pmOntario
$517
Southwest
Jul 16
ONT6:30 amOntario
3h 55m
1 stop
SAN10:25 amSan Diego
Jul 16
SAN8:05 pmSan Diego
3h 30m
1 stop
ONT11:35 pmOntario
$831

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 July 12, 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 8/4

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 8/11

7:45 pm-12:48 pm

1 stop17h 03m

$130

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 8/4

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 8/11

7:45 pm-12:48 pm

1 stop17h 03m

$131

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 8/4

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 8/11

3:03 pm-3:14 pm

1 stop24h 11m

$158

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 8/10

4:09 pm-8:06 pm

1 stop3h 57m

San Diego

Tue 8/11

7:45 pm-12:48 pm

1 stop17h 03m

$162

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 8/4

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 8/11

3:03 pm-12:48 pm

2 stops21h 45m

$166

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 8/6

8:58 am-11:59 pm

1 stop15h 01m

San Diego

Thu 8/13

7:45 pm-11:02 am

1 stop15h 17m

$177

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 8/4

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 8/11

4:28 pm-3:14 pm

2 stops22h 46m

$187

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 8/4

8:58 am-12:04 am

1 stop15h 06m

San Diego

Tue 8/11

4:28 pm-8:03 am

2 stops15h 35m

$192
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 8/24

8:48 am-2:50 pm

1 stop6h 02m

San Diego

Thu 8/27

6:25 am-4:22 pm

2 stops9h 57m

$193

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 9/4

8:48 am-2:50 pm

1 stop6h 02m

San Diego

Sun 9/6

10:00 am-11:02 am

1 stop25h 02m

$194

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 $240. 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 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

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