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Cheap flights from Ontario to San Diego from $44

1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Ontario to San Diego

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:00 am - 11:37 amONT  Ontario-SAN San Diego
3h 37m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$92Frontier
Wed, Dec 2 - Wed, Dec 9
Frontier Logo
8:31 pm - 10:26 amONT  Ontario-SAN San Diego
13h 55m1 stop San Francisco
Frontier Logo
8:50 am - 12:48 pmSAN  San Diego-ONT Ontario
3h 58m1 stop Las Vegas Harry Reid Intl
$111Frontier
Sat, Nov 21 - Thu, Nov 26
Frontier Logo
10:47 pm - 7:55 amONT  Ontario-SAN San Diego
9h 08m1 stop Las Vegas Harry Reid Intl
Frontier Logo
11:26 am - 7:36 pmSAN  San Diego-ONT Ontario
8h 10m1 stop Las Vegas Harry Reid Intl
$114Frontier
Sat, Nov 21 - Thu, Nov 26
Frontier Logo
10:40 pm - 7:55 amONT  Ontario-SAN San Diego
9h 15m1 stop Las Vegas Harry Reid Intl
Frontier Logo
9:05 am - 6:11 pmSAN  San Diego-ONT Ontario
9h 06m1 stop Las Vegas Harry Reid Intl
$117Frontier
Thu, Nov 26 - Thu, Dec 3
Frontier Logo
11:30 am - 11:57 pmONT  Ontario-SAN San Diego
12h 27m1 stop Denver Intl
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$123Frontier
Fri, Dec 4 - Mon, Dec 7
Frontier Logo
11:30 am - 11:58 pmONT  Ontario-SAN San Diego
12h 28m1 stop Denver Intl
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$127Frontier
Mon, Dec 7 - Mon, Dec 14
Frontier Logo
8:44 am - 6:16 pmONT  Ontario-SAN San Diego
9h 32m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
9:58 am - 6:31 pmSAN  San Diego-ONT Ontario
8h 33m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
$128Frontier
Wed, Dec 9 - Wed, Dec 16
Frontier Logo
8:35 pm - 7:55 amONT  Ontario-SAN San Diego
11h 20m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:50 am - 7:36 pmSAN  San Diego-ONT Ontario
10h 46m1 stop Las Vegas Harry Reid Intl
$132Frontier
Thu, Nov 19 - Sun, Nov 22
Frontier Logo
8:35 pm - 7:55 amONT  Ontario-SAN San Diego
11h 20m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:50 am - 7:36 pmSAN  San Diego-ONT Ontario
10h 46m1 stop Las Vegas Harry Reid Intl
$134Frontier
Thu, Nov 19 - Sun, Nov 22
Frontier Logo
11:30 am - 11:58 pmONT  Ontario-SAN San Diego
12h 28m1 stop Denver Intl
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$137Frontier
Fri, Dec 11 - Wed, Dec 16

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Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Dec 2
ONT8:00 amOntario
3h 37m
1 stop
SAN11:37 amSan Diego
Dec 9
SAN8:57 amSan Diego
9h 34m
1 stop
ONT6:31 pmOntario
$92
Frontier
Nov 21
ONT8:31 pmOntario
13h 55m
1 stop
SAN10:26 amSan Diego
Nov 26
SAN8:50 amSan Diego
3h 58m
1 stop
ONT12:48 pmOntario
$111
Frontier
Nov 21
ONT10:47 pmOntario
9h 08m
1 stop
SAN7:55 amSan Diego
Nov 26
SAN11:26 amSan Diego
8h 10m
1 stop
ONT7:36 pmOntario
$114

momondo Fare Finder

 
Use the filters below to find and compare flights from Ontario to San Diego that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 12/2

8:00 am-11:37 am

1 stop3h 37m

San Diego

Wed 12/9

8:57 am-6:31 pm

1 stop9h 34m

$92

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Sat 11/21

8:31 pm-10:26 am

1 stop13h 55m

San Diego

Thu 11/26

8:50 am-12:48 pm

1 stop3h 58m

$111

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Sat 11/21

10:47 pm-7:55 am

1 stop9h 08m

San Diego

Thu 11/26

11:26 am-7:36 pm

1 stop8h 10m

$114

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/26

10:40 pm-7:55 am

1 stop9h 15m

San Diego

Thu 12/3

9:05 am-6:11 pm

1 stop9h 06m

$117

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 12/4

11:30 am-11:57 pm

1 stop12h 27m

San Diego

Mon 12/7

8:57 am-6:31 pm

1 stop9h 34m

$123

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 12/7

11:30 am-11:58 pm

1 stop12h 28m

San Diego

Mon 12/14

8:57 am-6:31 pm

1 stop9h 34m

$127

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 12/9

8:44 am-6:16 pm

2 stops9h 32m

San Diego

Wed 12/16

9:58 am-6:31 pm

2 stops8h 33m

$128

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/19

8:35 pm-7:55 am

1 stop11h 20m

San Diego

Sun 11/22

8:50 am-7:36 pm

1 stop10h 46m

$132

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/19

8:35 pm-7:55 am

1 stop11h 20m

San Diego

Sun 11/22

8:50 am-7:36 pm

1 stop10h 46m

$134

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 12/11

11:30 am-11:58 pm

1 stop12h 28m

San Diego

Wed 12/16

8:57 am-6:31 pm

1 stop9h 34m

$137

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Diego from

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

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 Thursday. Travelers who choose to depart for San Diego on a Thursday will often find tickets for as low as $249. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $467. 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 afternoon when flights can be purchased for as low as $269. Flights at noon are often more expensive with an average ticket price of $369.

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

$44

Fastest flight time

5h 45m

Direct flights

None
The best one-way flight to San Diego from Ontario in the past 72 hours is $44. The best round-trip flight deal from Ontario to San Diego found on momondo in the last 72 hours is $92.
The fastest flight from Ontario to San Diego takes 5h 45m
There are no direct flights from Ontario to San Diego. There are no popular flight routes from Ontario to San Diego.
Search flight deals

Frequently asked questions about flying from Ontario to San Diego

  • 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 45m.

  • 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.

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Chula Vista
El Cajon
Coronado
National City
La Mesa
Julian
San Ysidro
Poway
Santee
Alpine
Imperial Beach
Lemon Grove
Borrego Springs

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.

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