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 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 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.

$56 Cheap Flights from Ontario to San Diego in 2026

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Find the cheapest flights from Ontario to San Diego

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:15 am - 11:31 pm

ONT

SAN

16h 16m1 stop

7:00 am - 3:07 pm

SAN

ONT

8h 07m1 stop

$113Frontier

Sat, Jan 24 - Tue, Jan 27

8:27 pm - 8:51 am

ONT

SAN

12h 24m1 stop

7:00 am - 3:07 pm

SAN

ONT

8h 07m1 stop

$129Frontier

Sun, Jan 25 - Tue, Jan 27

2:48 pm - 8:51 am

ONT

SAN

18h 03m1 stop

6:30 am - 12:20 am

SAN

ONT

17h 50m1 stop

$132Frontier

Sun, Feb 1 - Sun, Feb 8

7:15 am - 10:25 am

ONT

SAN

27h 10m2 stops

7:00 am - 3:07 pm

SAN

ONT

8h 07m1 stop

$144Frontier

Sat, Jan 24 - Tue, Jan 27

8:27 pm - 5:03 pm

ONT

SAN

20h 36m2 stops

10:51 am - 7:32 pm

SAN

ONT

8h 41m1 stop

$156Frontier

Sun, Feb 1 - Sun, Feb 8

5:21 pm - 8:51 am

ONT

SAN

15h 30m1 stop

6:30 am - 12:20 am

SAN

ONT

17h 50m1 stop

$170Frontier

Sun, Feb 1 - Sun, Feb 8

5:57 pm - 10:54 am

ONT

SAN

16h 57m2 stops

7:00 am - 3:07 pm

SAN

ONT

8h 07m1 stop

$208Frontier

Sun, Jan 25 - Tue, Jan 27

6:00 am - 11:09 pm

ONT

SAN

17h 09m1 stop

6:15 am - 3:08 pm

SAN

ONT

8h 53m1 stop

$227Alaska Airlines

Fri, Jan 30 - Sat, Jan 31

4:03 pm - 11:09 pm

ONT

SAN

7h 06m1 stop

6:15 am - 11:56 pm

SAN

ONT

17h 41m1 stop

$229Hawaiian Airlines

Thu, Jan 29 - Sun, Feb 1

2:48 pm - 8:51 am

ONT

SAN

18h 03m1 stop

8:16 pm - 10:32 am

SAN

ONT

14h 16m2 stops

$233Frontier

Sun, Feb 1 - Sun, Feb 8

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Jan 24

ONT7:15 amOntario

16h 16m

1 stop

SAN11:31 pmSan Diego

Jan 27

SAN7:00 amSan Diego

8h 07m

1 stop

ONT3:07 pmOntario

$113

Find similar

Frontier

Jan 25

ONT8:27 pmOntario

12h 24m

1 stop

SAN8:51 amSan Diego

Jan 27

SAN7:00 amSan Diego

8h 07m

1 stop

ONT3:07 pmOntario

$129

Find similar

Frontier

Feb 1

ONT2:48 pmOntario

18h 03m

1 stop

SAN8:51 amSan Diego

Feb 8

SAN6:30 amSan Diego

17h 50m

1 stop

ONT12:20 amOntario

$132

Find similar

Alaska Airlines flights from Ontario to San Diego

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

Alaska Airlines

Jan 30

ONT6:00 amOntario

17h 09m

1 stop

SAN11:09 pmSan Diego

Jan 31

SAN6:15 amSan Diego

8h 53m

1 stop

ONT3:08 pmOntario

$227

Find similar

Alaska Airlines

Feb 4

ONT11:53 amOntario

7h 26m

1 stop

SAN7:19 pmSan Diego

Feb 9

SAN8:42 pmSan Diego

18h 26m

1 stop

ONT3:08 pmOntario

$246

Find similar

Alaska Airlines

Jan 29

ONT6:00 amOntario

17h 09m

1 stop

SAN11:09 pmSan Diego

Feb 1

SAN6:15 amSan Diego

17h 41m

1 stop

ONT11:56 pmOntario

$247

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 1/24

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Tue 1/27

7:00 am-3:07 pm

1 stop8h 07m

$113

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 1/25

8:27 pm-8:51 am

1 stop12h 24m

San Diego

Tue 1/27

7:00 am-3:07 pm

1 stop8h 07m

$129

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 2/1

2:48 pm-8:51 am

1 stop18h 03m

San Diego

Sun 2/8

6:30 am-12:20 am

1 stop17h 50m

$132

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 1/24

7:15 am-10:25 am

2 stops27h 10m

San Diego

Tue 1/27

7:00 am-3:07 pm

1 stop8h 07m

$144

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 2/1

8:27 pm-5:03 pm

2 stops20h 36m

San Diego

Sun 2/8

10:51 am-7:32 pm

1 stop8h 41m

$156

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 2/1

5:21 pm-8:51 am

1 stop15h 30m

San Diego

Sun 2/8

6:30 am-12:20 am

1 stop17h 50m

$170

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 1/25

5:57 pm-10:54 am

2 stops16h 57m

San Diego

Tue 1/27

7:00 am-3:07 pm

1 stop8h 07m

$208

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 1/30

6:00 am-11:09 pm

1 stop17h 09m

San Diego

Sat 1/31

6:15 am-3:08 pm

1 stop8h 53m

$227

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/29

4:03 pm-11:09 pm

1 stop7h 06m

San Diego

Sun 2/1

6:15 am-11:56 pm

1 stop17h 41m

$229

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sun 2/1

2:48 pm-8:51 am

1 stop18h 03m

San Diego

Sun 2/8

8:16 pm-10:32 am

2 stops14h 16m

$233

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 $437. 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 $221. Flights in the afternoon are often more expensive with an average ticket price of $269.

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 06m
Direct flights	None

The fastest flight from Ontario to San Diego takes 7h 06m

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 06m.
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

Poway

National City

Imperial Beach

Borrego Springs

La Mesa

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.