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?

Alaska Airlines and Frontier 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.

$99 Cheap Flights from Ontario to San Diego in 2025/26

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Ontario to San Diego

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:52 am - 9:58 pm

ONT

SAN

14h 06m1 stop

7:10 am - 10:59 pm

SAN

ONT

15h 49m1 stop

$132Frontier

Tue, Jan 6 - Tue, Jan 13

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

7:52 am - 12:08 pm

ONT

SAN

28h 16m2 stops

7:10 am - 10:59 pm

SAN

ONT

15h 49m1 stop

$164Frontier

Tue, Jan 6 - Tue, Jan 13

6:00 pm - 11:16 pm

ONT

SAN

29h 16m2 stops

4:47 pm - 10:59 pm

SAN

ONT

30h 12m1 stop

$170Frontier

Mon, Jan 5 - Mon, Jan 12

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

6:00 am - 12:38 pm

ONT

SAN

6h 38m1 stop

4:47 pm - 10:59 pm

SAN

ONT

30h 12m1 stop

$177Frontier

Mon, Jan 5 - Mon, Jan 12

6:15 am - 9:57 am

ONT

SAN

27h 42m2 stops

4:47 pm - 10:59 pm

SAN

ONT

30h 12m1 stop

$182Frontier

Wed, Dec 17 - Mon, Jan 12

11:53 am - 7:19 pm

ONT

SAN

7h 26m1 stop

8:42 pm - 3:08 pm

SAN

ONT

18h 26m1 stop

$187Alaska Airlines

Wed, Jan 28 - Fri, Jan 30

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

11:53 am - 7:19 pm

ONT

SAN

7h 26m1 stop

6:15 am - 8:36 pm

SAN

ONT

14h 21m1 stop

$226Alaska Airlines

Sat, Jan 17 - Tue, Jan 20

Alaska Airlines flights from Ontario to San Diego

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

Alaska Airlines

Jan 28

ONT11:53 amOntario

7h 26m

1 stop

SAN7:19 pmSan Diego

Jan 30

SAN8:42 pmSan Diego

18h 26m

1 stop

ONT3:08 pmOntario

$187

Find similar

Alaska Airlines

Jan 8

ONT4:03 pmOntario

7h 06m

1 stop

SAN11:09 pmSan Diego

Jan 12

SAN6:15 amSan Diego

8h 53m

1 stop

ONT3:08 pmOntario

$217

Find similar

Alaska Airlines

Jan 17

ONT11:53 amOntario

7h 26m

1 stop

SAN7:19 pmSan Diego

Jan 20

SAN6:15 amSan Diego

14h 21m

1 stop

ONT8:36 pmOntario

$226

Find similar

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Jan 6

ONT7:52 amOntario

14h 06m

1 stop

SAN9:58 pmSan Diego

Jan 13

SAN7:10 amSan Diego

15h 49m

1 stop

ONT10:59 pmOntario

$132

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 6

ONT7:52 amOntario

28h 16m

2 stops

SAN12:08 pmSan Diego

Jan 13

SAN7:10 amSan Diego

15h 49m

1 stop

ONT10:59 pmOntario

$164

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 1/6

7:52 am-9:58 pm

1 stop14h 06m

San Diego

Tue 1/13

7:10 am-10:59 pm

1 stop15h 49m

$132

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

Tue 1/6

7:52 am-12:08 pm

2 stops28h 16m

San Diego

Tue 1/13

7:10 am-10:59 pm

1 stop15h 49m

$164

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 1/5

6:00 pm-11:16 pm

2 stops29h 16m

San Diego

Mon 1/12

4:47 pm-10:59 pm

1 stop30h 12m

$170

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

Mon 1/5

6:00 am-12:38 pm

1 stop6h 38m

San Diego

Mon 1/12

4:47 pm-10:59 pm

1 stop30h 12m

$177

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 12/17

6:15 am-9:57 am

2 stops27h 42m

San Diego

Mon 1/12

4:47 pm-10:59 pm

1 stop30h 12m

$182

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 1/28

11:53 am-7:19 pm

1 stop7h 26m

San Diego

Fri 1/30

8:42 pm-3:08 pm

1 stop18h 26m

$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

Sat 1/17

11:53 am-7:19 pm

1 stop7h 26m

San Diego

Tue 1/20

6:15 am-8:36 pm

1 stop14h 21m

$226

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	5h 51m
Direct flights	None

The fastest flight from Ontario to San Diego takes 5h 51m

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 5h 51m.
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.