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

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.

$67 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.

6:43 pm - 8:24 pm

ONT

SAN

25h 41m

2 stops

2:00 pm - 1:11 pm

SAN

ONT

23h 11m

1 stop

$153Frontier

lun., feb. 23 - lun., mar. 2

6:10 am - 12:08 am

ONT

SAN

17h 58m

1 stop

2:00 pm - 1:11 pm

SAN

ONT

23h 11m

1 stop

$201Frontier

lun., feb. 23 - lun., mar. 2

8:05 pm - 8:24 pm

ONT

SAN

24h 19m

2 stops

2:38 pm - 7:22 am

SAN

ONT

16h 44m

1 stop

$219Frontier

lun., feb. 9 - jue., feb. 12

8:36 am - 9:41 pm

ONT

SAN

13h 05m

1 stop

8:00 am - 7:14 pm

SAN

ONT

11h 14m

2 stops

$236Frontier

mar., feb. 10 - sáb., feb. 14

12:59 am - 8:34 am

ONT

SAN

7h 35m

1 stop

9:07 pm - 8:04 am

SAN

ONT

10h 57m

1 stop

$270Frontier

sáb., may. 2 - jue., may. 7

4:22 pm - 9:29 pm

ONT

SAN

5h 07m

1 stop

9:14 pm - 3:42 pm

SAN

ONT

18h 28m

1 stop

$283Alaska Airlines

mié., abr. 1 - mié., abr. 8

12:59 am - 8:34 am

ONT

SAN

7h 35m

1 stop

3:20 pm - 8:04 am

SAN

ONT

16h 44m

2 stops

$303Frontier

sáb., may. 2 - jue., may. 7

8:36 am - 9:41 pm

ONT

SAN

13h 05m

1 stop

12:23 pm - 11:59 pm

SAN

ONT

11h 36m

1 stop

$309Frontier

mar., feb. 10 - sáb., feb. 14

12:18 pm - 8:53 am

ONT

SAN

20h 35m

1 stop

7:42 pm - 8:49 am

SAN

ONT

13h 07m

1 stop

$314American Airlines

mié., feb. 18 - dom., feb. 22

6:20 am - 12:08 am

ONT

SAN

17h 48m

1 stop

2:38 pm - 7:22 am

SAN

ONT

16h 44m

1 stop

$320Frontier

lun., feb. 9 - jue., feb. 12

American Airlines flights from Ontario to San Diego

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

American Airlines

Feb 18

ONT12:18 pmOntario

20h 35m

1 stop

SAN8:53 amSan Diego

Feb 22

SAN7:42 pmSan Diego

13h 07m

1 stop

ONT8:49 amOntario

$314

American Airlines

Feb 22

ONT7:05 pmOntario

13h 48m

1 stop

SAN8:53 amSan Diego

Mar 1

SAN7:42 pmSan Diego

13h 06m

1 stop

ONT8:48 amOntario

$388

American Airlines

Feb 19

ONT5:02 pmOntario

4h 37m

1 stop

SAN9:39 pmSan Diego

Feb 22

SAN1:09 pmSan Diego

5h 06m

1 stop

ONT6:15 pmOntario

$705

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Feb 23

ONT6:43 pmOntario

25h 41m

2 stops

SAN8:24 pmSan Diego

Mar 2

SAN2:00 pmSan Diego

23h 11m

1 stop

ONT1:11 pmOntario

$153

Frontier

Feb 23

ONT6:10 amOntario

17h 58m

1 stop

SAN12:08 amSan Diego

Mar 2

SAN2:00 pmSan Diego

23h 11m

1 stop

ONT1:11 pmOntario

$201

Frontier

Feb 9

ONT8:05 pmOntario

24h 19m

2 stops

SAN8:24 pmSan Diego

Feb 12

SAN2:38 pmSan Diego

16h 44m

1 stop

ONT7:22 amOntario

$219

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

lun. 2/23

6:43 pm-8:24 pm

2 stops25h 41m

San Diego

lun. 3/2

2:00 pm-1:11 pm

1 stop23h 11m

$153

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

lun. 2/23

6:10 am-12:08 am

1 stop17h 58m

San Diego

lun. 3/2

2:00 pm-1:11 pm

1 stop23h 11m

$201

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

lun. 2/9

8:05 pm-8:24 pm

2 stops24h 19m

San Diego

jue. 2/12

2:38 pm-7:22 am

1 stop16h 44m

$219

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

mar. 2/10

8:36 am-9:41 pm

1 stop13h 05m

San Diego

sáb. 2/14

8:00 am-7:14 pm

2 stops11h 14m

$236

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

sáb. 5/2

12:59 am-8:34 am

1 stop7h 35m

San Diego

jue. 5/7

9:07 pm-8:04 am

1 stop10h 57m

$270

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

mié. 4/1

4:22 pm-9:29 pm

1 stop5h 07m

San Diego

mié. 4/8

9:14 pm-3:42 pm

1 stop18h 28m

$283

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

sáb. 5/2

12:59 am-8:34 am

1 stop7h 35m

San Diego

jue. 5/7

3:20 pm-8:04 am

2 stops16h 44m

$303

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

mar. 2/10

8:36 am-9:41 pm

1 stop13h 05m

San Diego

sáb. 2/14

12:23 pm-11:59 pm

1 stop11h 36m

$309

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

mié. 2/18

12:18 pm-8:53 am

1 stop20h 35m

San Diego

dom. 2/22

7:42 pm-8:49 am

1 stop13h 07m

$314

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

lun. 2/9

6:20 am-12:08 am

1 stop17h 48m

San Diego

jue. 2/12

2:38 pm-7:22 am

1 stop16h 44m

$320

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 $217. Flights in the afternoon are often more expensive with an average ticket price of $283.

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 07m
Direct flights	None

The fastest flight from Ontario to San Diego takes 5h 07m

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 07m.
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

San Ysidro

Borrego Springs

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.