What airlines fly to San Diego?

United Airlines, Delta and Alaska 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 41% 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 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.

$85 Cheap Flights from Ontario to San Diego in 2025/26

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Find the cheapest flights from Ontario to San Diego

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

10:45 am - 9:57 pm

ONT

SAN

11h 12m1 stop

12:00 pm - 10:59 pm

SAN

ONT

10h 59m1 stop

$119Frontier

Wed, Jan 7 - Wed, Jan 14

10:18 pm - 1:29 pm

ONT

SAN

15h 11m1 stop

9:16 am - 3:39 pm

SAN

ONT

6h 23m1 stop

$134Frontier

Thu, Jan 8 - Thu, Jan 15

10:45 am - 9:57 pm

ONT

SAN

11h 12m1 stop

1:35 pm - 10:59 pm

SAN

ONT

9h 24m2 stops

$138Frontier

Wed, Jan 7 - Wed, Jan 14

10:18 pm - 1:29 pm

ONT

SAN

15h 11m1 stop

9:12 pm - 7:50 pm

SAN

ONT

46h 38m2 stops

$171Frontier

Thu, Jan 8 - Thu, Jan 15

6:00 am - 11:59 pm

ONT

SAN

17h 59m1 stop

9:12 pm - 7:50 pm

SAN

ONT

46h 38m2 stops

$176Frontier

Thu, Jan 8 - Thu, Jan 15

3:30 pm - 10:04 am

ONT

SAN

18h 34m1 stop

6:50 am - 10:37 pm

SAN

ONT

15h 47m1 stop

$187Delta

Tue, Feb 24 - Mon, Mar 2

4:03 pm - 11:09 pm

ONT

SAN

7h 06m1 stop

6:15 am - 3:08 pm

SAN

ONT

8h 53m1 stop

$217Alaska Airlines

Thu, Jan 8 - Mon, Jan 12

6:14 am - 11:03 pm

ONT

SAN

16h 49m1 stop

8:39 am - 10:44 pm

SAN

ONT

14h 05m1 stop

$246Alaska Airlines

Thu, Feb 19 - Wed, Feb 25

6:00 am - 12:11 pm

ONT

SAN

6h 11m1 stop

1:06 pm - 5:22 pm

SAN

ONT

4h 16m1 stop

$247Frontier

Wed, Dec 24 - Thu, Dec 25

7:30 am - 2:29 pm

ONT

SAN

6h 59m1 stop

10:59 am - 10:37 pm

SAN

ONT

11h 38m1 stop

$267Delta

Sun, Mar 1 - Tue, Mar 3

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Jan 7

ONT10:45 amOntario

11h 12m

1 stop

SAN9:57 pmSan Diego

Jan 14

SAN12:00 pmSan Diego

10h 59m

1 stop

ONT10:59 pmOntario

$119

Find similar

Frontier

Jan 8

ONT10:18 pmOntario

15h 11m

1 stop

SAN1:29 pmSan Diego

Jan 15

SAN9:16 amSan Diego

6h 23m

1 stop

ONT3:39 pmOntario

$134

Find similar

Frontier

Jan 7

ONT10:45 amOntario

11h 12m

1 stop

SAN9:57 pmSan Diego

Jan 14

SAN1:35 pmSan Diego

9h 24m

2 stops

ONT10:59 pmOntario

$138

Find similar

United Airlines flights from Ontario to San Diego

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

United Airlines

Jan 16

ONT5:05 amOntario

17h 32m

1 stop

SAN10:37 pmSan Diego

Jan 19

SAN6:55 pmSan Diego

17h 52m

1 stop

ONT12:47 pmOntario

$443

Find similar

United Airlines

Jan 8

ONT1:24 pmOntario

9h 13m

1 stop

SAN10:37 pmSan Diego

Jan 12

SAN6:15 amSan Diego

11h 28m

2 stops

ONT5:43 pmOntario

$470

Find similar

United Airlines

Dec 14

ONT6:00 amOntario

9h 02m

1 stop

SAN3:02 pmSan Diego

Dec 15

SAN9:54 amSan Diego

7h 43m

1 stop

ONT5:37 pmOntario

$688

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 1/7

10:45 am-9:57 pm

1 stop11h 12m

San Diego

Wed 1/14

12:00 pm-10:59 pm

1 stop10h 59m

$119

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

10:18 pm-1:29 pm

1 stop15h 11m

San Diego

Thu 1/15

9:16 am-3:39 pm

1 stop6h 23m

$134

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 1/7

10:45 am-9:57 pm

1 stop11h 12m

San Diego

Wed 1/14

1:35 pm-10:59 pm

2 stops9h 24m

$138

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

10:18 pm-1:29 pm

1 stop15h 11m

San Diego

Thu 1/15

9:12 pm-7:50 pm

2 stops46h 38m

$171

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

6:00 am-11:59 pm

1 stop17h 59m

San Diego

Thu 1/15

9:12 pm-7:50 pm

2 stops46h 38m

$176

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 2/24

3:30 pm-10:04 am

1 stop18h 34m

San Diego

Mon 3/2

6:50 am-10:37 pm

1 stop15h 47m

$187

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

4:03 pm-11:09 pm

1 stop7h 06m

San Diego

Mon 1/12

6:15 am-3:08 pm

1 stop8h 53m

$217

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 2/19

6:14 am-11:03 pm

1 stop16h 49m

San Diego

Wed 2/25

8:39 am-10:44 pm

1 stop14h 05m

$246

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 12/24

6:00 am-12:11 pm

1 stop6h 11m

San Diego

Thu 12/25

1:06 pm-5:22 pm

1 stop4h 16m

$247

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 3/1

7:30 am-2:29 pm

1 stop6h 59m

San Diego

Tue 3/3

10:59 am-10:37 pm

1 stop11h 38m

$267

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 $413. 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 $235. Flights in the afternoon are often more expensive with an average ticket price of $272.

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	7h 39m
Direct flights	None

The fastest flight from Ontario to San Diego takes 7h 39m

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 7h 39m.
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

National City

Imperial Beach

Poway

La Mesa

Borrego Springs

San Ysidro

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.