What airlines fly to San Diego?

United Airlines, Delta and Spirit Airlines are the top three most popular airlines that fly to San Diego from Ontario according to our data. United Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 5 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Ontario to San Diego?

Frontier, United Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to San Diego

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.

$79 Cheap Flights from Ontario to San Diego in 2025/26

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Find the cheapest flights from Ontario to San Diego

Round-trip

One-way

Last minute

Cheap round-trip flights

8:00 am - 12:31 pmONT-SAN

4h 31m1 stop

6:15 am - 12:43 pmSAN-ONT

6h 28m1 stop

$144Multiple Airlines

Find Deal

Tue, Sep 30 - Sat, Oct 4

6:53 am - 1:28 pmONT-SAN

6h 35m1 stop

6:36 am - 11:57 pmSAN-ONT

17h 21m1 stop

$154Frontier

Find Deal

Tue, Nov 18 - Thu, Nov 20

10:47 pm - 9:20 pmONT-SAN

22h 33m1 stop

5:28 pm - 12:12 amSAN-ONT

6h 44m1 stop

$161Frontier

Find Deal

Mon, Oct 13 - Mon, Oct 20

8:00 am - 7:29 amONT-SAN

23h 29m1 stop

12:33 pm - 7:17 amSAN-ONT

18h 44m1 stop

$169Multiple Airlines

Find Deal

Wed, Oct 1 - Sun, Oct 5

8:00 am - 9:20 pmONT-SAN

13h 20m1 stop

8:00 am - 8:42 pmSAN-ONT

12h 42m1 stop

$171Frontier

Find Deal

Wed, Oct 15 - Wed, Oct 22

6:36 pm - 7:56 amONT-SAN

13h 20m1 stop

9:54 am - 10:51 pmSAN-ONT

12h 57m1 stop

$353United Airlines

Find Deal

Mon, Oct 20 - Mon, Oct 27

1:33 pm - 10:49 pmONT-SAN

9h 16m1 stop

11:20 am - 8:44 pmSAN-ONT

9h 24m1 stop

$377United Airlines

Find Deal

Wed, Oct 29 - Sat, Nov 1

1:31 pm - 8:53 pmONT-SAN

7h 22m1 stop

6:09 pm - 11:51 pmSAN-ONT

5h 42m1 stop

$420Alaska Airlines

Find Deal

Wed, Oct 22 - Fri, Oct 24

7:10 am - 5:13 pmONT-SAN

10h 03m1 stop

7:50 pm - 12:37 pmSAN-ONT

16h 47m1 stop

$462Alaska Airlines

Find Deal

Sat, Oct 11 - Sat, Oct 11

7:16 pm - 8:53 amONT-SAN

13h 37m1 stop

9:45 am - 6:16 pmSAN-ONT

8h 31m1 stop

$741American Airlines

Find Deal

Sun, Sep 28 - Sat, Oct 4

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Nov 18

ONT6:53 amOntario

6h 35m

1 stop

SAN1:28 pmSan Diego

Nov 20

SAN6:36 amSan Diego

17h 21m

1 stop

ONT11:57 pmOntario

$154

Find similar

Frontier

Oct 13

ONT10:47 pmOntario

22h 33m

1 stop

SAN9:20 pmSan Diego

Oct 20

SAN5:28 pmSan Diego

6h 44m

1 stop

ONT12:12 amOntario

$161

Find similar

Frontier

Oct 15

ONT8:00 amOntario

13h 20m

1 stop

SAN9:20 pmSan Diego

Oct 22

SAN8:00 amSan Diego

12h 42m

1 stop

ONT8:42 pmOntario

$171

Find similar

United Airlines flights from Ontario to San Diego

Our best United Airlines deals on Ontario to San Diego flight tickets

United Airlines

Oct 20

ONT6:36 pmOntario

13h 20m

1 stop

SAN7:56 amSan Diego

Oct 27

SAN9:54 amSan Diego

12h 57m

1 stop

ONT10:51 pmOntario

$353

Find similar

United Airlines

Oct 29

ONT1:33 pmOntario

9h 16m

1 stop

SAN10:49 pmSan Diego

Nov 1

SAN11:20 amSan Diego

9h 24m

1 stop

ONT8:44 pmOntario

$377

Find similar

United Airlines

Oct 15

ONT6:36 pmOntario

13h 20m

1 stop

SAN7:56 amSan Diego

Oct 16

SAN1:59 pmSan Diego

8h 53m

1 stop

ONT10:52 pmOntario

$404

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 9/30

8:00 am-12:31 pm

1 stop4h 31m

San Diego

Sat 10/4

6:15 am-12:43 pm

1 stop6h 28m

$144

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 11/18

6:53 am-1:28 pm

1 stop6h 35m

San Diego

Thu 11/20

6:36 am-11:57 pm

1 stop17h 21m

$154

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 10/13

10:47 pm-9:20 pm

1 stop22h 33m

San Diego

Mon 10/20

5:28 pm-12:12 am

1 stop6h 44m

$161

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 10/1

8:00 am-7:29 am

1 stop23h 29m

San Diego

Sun 10/5

12:33 pm-7:17 am

1 stop18h 44m

$169

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 10/15

8:00 am-9:20 pm

1 stop13h 20m

San Diego

Wed 10/22

8:00 am-8:42 pm

1 stop12h 42m

$171

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 10/20

6:36 pm-7:56 am

1 stop13h 20m

San Diego

Mon 10/27

9:54 am-10:51 pm

1 stop12h 57m

$353

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 10/29

1:33 pm-10:49 pm

1 stop9h 16m

San Diego

Sat 11/1

11:20 am-8:44 pm

1 stop9h 24m

$377

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 10/22

1:31 pm-8:53 pm

1 stop7h 22m

San Diego

Fri 10/24

6:09 pm-11:51 pm

1 stop5h 42m

$420

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 10/11

7:10 am-5:13 pm

1 stop10h 03m

San Diego

Sat 10/11

7:50 pm-12:37 pm

1 stop16h 47m

$462

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 9/28

7:16 pm-8:53 am

1 stop13h 37m

San Diego

Sat 10/4

9:45 am-6:16 pm

1 stop8h 31m

$741

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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 $179. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $407. 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 at noon when flights can be purchased for as low as $179. 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

Direct flights	None

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 4h 31m.
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.

Coronado

Chula Vista

El Cajon

Julian

La Mesa

National City

Poway

Imperial Beach

San Ysidro

Borrego Springs

Lemon Grove

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.