What airlines fly to San Diego?

United Airlines, Delta and Spirit 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 38% 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 American 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.

$76 Cheap Flights from Ontario to San Diego in 2025

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

7:00 am - 6:19 pmONT-SAN

11h 19m1 stop

7:04 pm - 11:53 amSAN-ONT

16h 49m1 stop

$134Frontier

Find Deal

Wed, Aug 6 - Sun, Aug 10

10:13 pm - 8:04 pmONT-SAN

21h 51m1 stop

8:00 am - 4:18 pmSAN-ONT

8h 18m1 stop

$148Frontier

Find Deal

Fri, Aug 29 - Tue, Sep 2

7:30 pm - 11:17 pmONT-SAN

3h 47m1 stop

8:00 am - 9:56 pmSAN-ONT

13h 56m1 stop

$160Frontier

Find Deal

Sun, Sep 7 - Wed, Sep 10

1:37 pm - 6:37 pmONT-SAN

5h 00m1 stop

6:25 am - 8:54 pmSAN-ONT

14h 29m1 stop

$163Frontier

Find Deal

Sat, Oct 18 - Mon, Oct 20

8:00 am - 9:24 pmONT-SAN

13h 24m1 stop

12:23 pm - 8:56 pmSAN-ONT

8h 33m1 stop

$167Frontier

Find Deal

Tue, Sep 16 - Thu, Sep 18

9:58 pm - 3:48 pmONT-SAN

17h 50m1 stop

8:00 am - 9:56 pmSAN-ONT

13h 56m1 stop

$168Frontier

Find Deal

Sun, Sep 14 - Wed, Sep 17

9:41 pm - 3:02 pmONT-SAN

17h 21m1 stop

9:58 am - 11:40 pmSAN-ONT

13h 42m1 stop

$173Frontier

Find Deal

Fri, Oct 24 - Sun, Oct 26

6:00 am - 12:08 pmONT-SAN

6h 08m1 stop

1:03 pm - 8:52 pmSAN-ONT

7h 49m1 stop

$175Frontier

Find Deal

Mon, Aug 11 - Mon, Aug 18

4:54 pm - 7:38 pmONT-SAN

26h 44m1 stop

4:20 pm - 4:05 pmSAN-ONT

23h 45m1 stop

$183American Airlines

Find Deal

Tue, Aug 26 - Tue, Sep 2

12:22 pm - 9:55 pmONT-SAN

9h 33m1 stop

6:15 am - 4:24 pmSAN-ONT

10h 09m1 stop

$214American Airlines

Find Deal

Thu, Aug 7 - Sat, Aug 9

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets

Frontier

Aug 6

ONT7:00 amOntario

11h 19m

1 stop

SAN6:19 pmSan Diego

Aug 10

SAN7:04 pmSan Diego

16h 49m

1 stop

ONT11:53 amOntario

$134

Find similar

Frontier

Aug 29

ONT10:13 pmOntario

21h 51m

1 stop

SAN8:04 pmSan Diego

Sep 2

SAN8:00 amSan Diego

8h 18m

1 stop

ONT4:18 pmOntario

$148

Find similar

Frontier

Sep 7

ONT7:30 pmOntario

3h 47m

1 stop

SAN11:17 pmSan Diego

Sep 10

SAN8:00 amSan Diego

13h 56m

1 stop

ONT9:56 pmOntario

$160

Find similar

American Airlines flights from Ontario to San Diego

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

American Airlines

Aug 26

ONT4:54 pmOntario

26h 44m

1 stop

SAN7:38 pmSan Diego

Sep 2

SAN4:20 pmSan Diego

23h 45m

1 stop

ONT4:05 pmOntario

$183

Find similar

American Airlines

Aug 7

ONT12:22 pmOntario

9h 33m

1 stop

SAN9:55 pmSan Diego

Aug 9

SAN6:15 amSan Diego

10h 09m

1 stop

ONT4:24 pmOntario

$214

Find similar

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 $189. 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 at noon when flights can be purchased for as low as $179. Flights in the afternoon are often more expensive with an average ticket price of $245.

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

Best Price Found	$76
Fastest flight time	3h 29m
Direct flights	None
Airports in San Diego	1 airport

The best one-way flight to San Diego from Ontario in the past 72 hours is $76. The best round-trip flight deal from Ontario to San Diego found on momondo in the last 72 hours is $134.

The fastest flight from Ontario to San Diego takes 3h 29m

There are no direct flights from Ontario to San Diego. Popular non-direct route for this connection is Ontario Airport - San Diego Airport.

There is 1 airport near San Diego: San Diego (SAN)

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 47m.
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

El Cajon

Chula Vista

Julian

National City

La Mesa

Imperial Beach

San Ysidro

Poway

Borrego Springs

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.