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 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.

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.

$75 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

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10:18 pm - 1:29 pmONT-SAN

15h 11m1 stop

4:47 pm - 11:56 pmSAN-ONT

7h 09m1 stop

$129Frontier

Find Deal

Thu, Jan 8 - Mon, Jan 12

2:34 pm - 1:29 pmONT-SAN

22h 55m1 stop

4:47 pm - 11:56 pmSAN-ONT

7h 09m1 stop

$131Frontier

Find Deal

Thu, Jan 8 - Mon, Jan 12

10:18 pm - 1:29 pmONT-SAN

15h 11m1 stop

6:36 am - 11:56 pmSAN-ONT

17h 20m1 stop

$134Frontier

Find Deal

Thu, Jan 8 - Mon, Jan 12

6:00 am - 9:57 amONT-SAN

27h 57m2 stops

4:47 pm - 11:56 pmSAN-ONT

7h 09m1 stop

$157Frontier

Find Deal

Thu, Jan 8 - Mon, Jan 12

6:17 pm - 12:11 pmONT-SAN

17h 54m1 stop

1:06 pm - 9:17 pmSAN-ONT

8h 11m1 stop

$158Frontier

Find Deal

Tue, Dec 23 - Tue, Dec 30

6:00 am - 9:57 amONT-SAN

27h 57m2 stops

4:47 pm - 11:56 pmSAN-ONT

7h 09m1 stop

$161Frontier

Find Deal

Thu, Jan 8 - Mon, Jan 12

7:15 am - 11:31 pmONT-SAN

16h 16m1 stop

9:45 pm - 11:24 pmSAN-ONT

25h 39m2 stops

$162Frontier

Find Deal

Tue, Jan 20 - Fri, Jan 23

6:17 pm - 12:11 pmONT-SAN

17h 54m1 stop

1:06 pm - 5:22 pmSAN-ONT

4h 16m1 stop

$170Frontier

Find Deal

Tue, Dec 23 - Tue, Dec 30

6:17 pm - 12:11 pmONT-SAN

17h 54m1 stop

9:14 pm - 11:59 pmSAN-ONT

26h 45m2 stops

$186Frontier

Find Deal

Tue, Dec 23 - Tue, Dec 30

6:17 pm - 12:11 pmONT-SAN

17h 54m1 stop

9:14 pm - 11:59 pmSAN-ONT

26h 45m2 stops

$198Frontier

Find Deal

Tue, Dec 23 - Tue, Dec 30

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Jan 8

ONT10:18 pmOntario

15h 11m

1 stop

SAN1:29 pmSan Diego

Jan 12

SAN4:47 pmSan Diego

7h 09m

1 stop

ONT11:56 pmOntario

$129

Find similar

Frontier

Jan 8

ONT2:34 pmOntario

22h 55m

1 stop

SAN1:29 pmSan Diego

Jan 12

SAN4:47 pmSan Diego

7h 09m

1 stop

ONT11:56 pmOntario

$131

Find similar

Frontier

Jan 8

ONT10:18 pmOntario

15h 11m

1 stop

SAN1:29 pmSan Diego

Jan 12

SAN6:36 amSan Diego

17h 20m

1 stop

ONT11:56 pmOntario

$134

Find similar

United Airlines flights from Ontario to San Diego

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

United Airlines

Dec 9

ONT6:00 amOntario

9h 02m

1 stop

SAN3:02 pmSan Diego

Dec 13

SAN9:54 amSan Diego

7h 43m

1 stop

ONT5:37 pmOntario

$423

Find similar

United Airlines

Jan 14

ONT1:24 pmOntario

9h 13m

1 stop

SAN10:37 pmSan Diego

Jan 15

SAN9:55 amSan Diego

12h 58m

1 stop

ONT10:53 pmOntario

$431

Find similar

United Airlines

Jan 19

ONT5:05 amOntario

15h 37m

1 stop

SAN8:42 pmSan Diego

Jan 23

SAN6:55 pmSan Diego

17h 52m

1 stop

ONT12:47 pmOntario

$487

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

10:18 pm-1:29 pm

1 stop15h 11m

San Diego

Mon 1/12

4:47 pm-11:56 pm

1 stop7h 09m

$129

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

2:34 pm-1:29 pm

1 stop22h 55m

San Diego

Mon 1/12

4:47 pm-11:56 pm

1 stop7h 09m

$131

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

10:18 pm-1:29 pm

1 stop15h 11m

San Diego

Mon 1/12

6:36 am-11:56 pm

1 stop17h 20m

$134

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

6:00 am-9:57 am

2 stops27h 57m

San Diego

Mon 1/12

4:47 pm-11:56 pm

1 stop7h 09m

$157

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 12/23

6:17 pm-12:11 pm

1 stop17h 54m

San Diego

Tue 12/30

1:06 pm-9:17 pm

1 stop8h 11m

$158

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 1/8

6:00 am-9:57 am

2 stops27h 57m

San Diego

Mon 1/12

4:47 pm-11:56 pm

1 stop7h 09m

$161

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 1/20

7:15 am-11:31 pm

1 stop16h 16m

San Diego

Fri 1/23

9:45 pm-11:24 pm

2 stops25h 39m

$162

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 12/23

6:17 pm-12:11 pm

1 stop17h 54m

San Diego

Tue 12/30

1:06 pm-5:22 pm

1 stop4h 16m

$170

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 12/23

6:17 pm-12:11 pm

1 stop17h 54m

San Diego

Tue 12/30

9:14 pm-11:59 pm

2 stops26h 45m

$186

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 12/23

6:17 pm-12:11 pm

1 stop17h 54m

San Diego

Tue 12/30

9:14 pm-11:59 pm

2 stops26h 45m

$198

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 in the morning when flights can be purchased for as low as $232. 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	4h 51m
Direct flights	None

The fastest flight from Ontario to San Diego takes 4h 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 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

National City

Imperial Beach

La Mesa

Poway

Borrego Springs

San Ysidro

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.