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

Alaska Airlines is the most popular carrier operating from Ontario to San Diego

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.

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.

$135 Cheap Flights from Ontario to San Diego in 2026

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Find the cheapest flights from Ontario to San Diego

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:20 am - 12:08 am

ONT

SAN

17h 48m

1 stop

2:00 pm - 1:11 pm

SAN

ONT

23h 11m

1 stop

$135Frontier

Mon, Feb 9 - Mon, Feb 16

7:15 am - 11:31 pm

ONT

SAN

16h 16m

1 stop

7:11 am - 9:34 pm

SAN

ONT

14h 23m

1 stop

$166Frontier

Tue, Jan 27 - Tue, Feb 24

7:15 am - 11:31 pm

ONT

SAN

16h 16m

1 stop

10:51 am - 12:10 pm

SAN

ONT

25h 19m

1 stop

$167Frontier

Wed, Jan 28 - Sun, Feb 1

11:27 am - 12:08 am

ONT

SAN

12h 41m

2 stops

2:00 pm - 1:11 pm

SAN

ONT

23h 11m

1 stop

$178Frontier

Mon, Feb 9 - Mon, Feb 16

8:36 am - 9:41 pm

ONT

SAN

13h 05m

1 stop

7:11 am - 9:34 pm

SAN

ONT

14h 23m

1 stop

$186Frontier

Tue, Feb 10 - Tue, Feb 17

7:15 am - 11:31 pm

ONT

SAN

16h 16m

1 stop

8:00 am - 9:34 pm

SAN

ONT

37h 34m

2 stops

$189Frontier

Tue, Jan 27 - Tue, Feb 24

6:00 am - 12:08 am

ONT

SAN

18h 08m

1 stop

12:23 pm - 7:59 am

SAN

ONT

19h 36m

1 stop

$192Frontier

Fri, Feb 27 - Sat, Feb 28

7:15 am - 11:31 pm

ONT

SAN

16h 16m

1 stop

7:11 am - 9:34 pm

SAN

ONT

14h 23m

1 stop

$193Frontier

Sat, Jan 31 - Tue, Feb 24

6:00 am - 12:08 am

ONT

SAN

18h 08m

1 stop

6:25 am - 7:14 pm

SAN

ONT

12h 49m

2 stops

$214Frontier

Fri, Feb 27 - Sat, Feb 28

7:15 am - 11:31 pm

ONT

SAN

16h 16m

1 stop

8:00 am - 9:34 pm

SAN

ONT

37h 34m

2 stops

$217Frontier

Sat, Jan 31 - Tue, Feb 24

Alaska Airlines flights from Ontario to San Diego

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

Alaska Airlines

Mar 24

ONT4:22 pmOntario

5h 07m

1 stop

SAN9:29 pmSan Diego

Apr 15

SAN9:14 pmSan Diego

18h 28m

1 stop

ONT3:42 pmOntario

$283

Alaska Airlines

Mar 11

ONT12:02 pmOntario

6h 28m

1 stop

SAN6:30 pmSan Diego

Mar 13

SAN8:26 pmSan Diego

14h 42m

1 stop

ONT11:08 amOntario

$285

Alaska Airlines

Apr 12

ONT4:28 pmOntario

19h 06m

1 stop

SAN11:34 amSan Diego

Apr 15

SAN9:14 pmSan Diego

18h 28m

1 stop

ONT3:42 pmOntario

$313

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Feb 9

ONT6:20 amOntario

17h 48m

1 stop

SAN12:08 amSan Diego

Feb 16

SAN2:00 pmSan Diego

23h 11m

1 stop

ONT1:11 pmOntario

$135

Frontier

Jan 27

ONT7:15 amOntario

16h 16m

1 stop

SAN11:31 pmSan Diego

Feb 24

SAN7:11 amSan Diego

14h 23m

1 stop

ONT9:34 pmOntario

$166

Frontier

Jan 28

ONT7:15 amOntario

16h 16m

1 stop

SAN11:31 pmSan Diego

Feb 1

SAN10:51 amSan Diego

25h 19m

1 stop

ONT12:10 pmOntario

$167

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 2/9

6:20 am-12:08 am

1 stop17h 48m

San Diego

Mon 2/16

2:00 pm-1:11 pm

1 stop23h 11m

$135

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 1/27

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Tue 2/24

7:11 am-9:34 pm

1 stop14h 23m

$166

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 1/28

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Sun 2/1

10:51 am-12:10 pm

1 stop25h 19m

$167

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 2/9

11:27 am-12:08 am

2 stops12h 41m

San Diego

Mon 2/16

2:00 pm-1:11 pm

1 stop23h 11m

$178

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 2/10

8:36 am-9:41 pm

1 stop13h 05m

San Diego

Tue 2/17

7:11 am-9:34 pm

1 stop14h 23m

$186

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 1/27

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Tue 2/24

8:00 am-9:34 pm

2 stops37h 34m

$189

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 2/27

6:00 am-12:08 am

1 stop18h 08m

San Diego

Sat 2/28

12:23 pm-7:59 am

1 stop19h 36m

$192

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 1/31

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Tue 2/24

7:11 am-9:34 pm

1 stop14h 23m

$193

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 2/27

6:00 am-12:08 am

1 stop18h 08m

San Diego

Sat 2/28

6:25 am-7:14 pm

2 stops12h 49m

$214

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 1/31

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Tue 2/24

8:00 am-9:34 pm

2 stops37h 34m

$217

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 $274.

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 57m
Direct flights	None

The fastest flight from Ontario to San Diego takes 3h 57m

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 57m.
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

San Ysidro

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.