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Cheap flights from Ontario to San Diego from $65

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
6:00 am - 11:57 pmONT  Ontario-SAN San Diego
17h 57m1 stop Denver Intl
Frontier Logo
7:51 pm - 11:23 pmSAN  San Diego-ONT Ontario
27h 32m1 stop San Francisco
$149Frontier
Tue, Dec 1 - Fri, Dec 4
Frontier Logo
2:23 pm - 7:47 pmONT  Ontario-SAN San Diego
5h 24m1 stop Las Vegas Harry Reid Intl
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$155Frontier
Mon, Nov 2 - Tue, Nov 3
Frontier Logo
6:00 am - 9:13 amONT  Ontario-SAN San Diego
27h 13m2 stops Denver Intl Phoenix Sky Harbor Intl
Frontier Logo
6:30 am - 12:17 amSAN  San Diego-ONT Ontario
17h 47m1 stop Denver Intl
$178Frontier
Tue, Dec 1 - Fri, Dec 4
Frontier Logo
8:35 pm - 3:58 pmONT  Ontario-SAN San Diego
19h 23m2 stops Las Vegas Harry Reid Intl Denver Intl
Frontier Logo
10:56 am - 7:30 pmSAN  San Diego-ONT Ontario
8h 34m1 stop San Francisco
$197Frontier
Fri, Nov 6 - Sun, Nov 8
Frontier Logo
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
10:56 am - 7:30 pmSAN  San Diego-ONT Ontario
8h 34m1 stop San Francisco
$202Frontier
Thu, Nov 5 - Sun, Nov 8
Frontier Logo
3:38 pm - 7:49 pmONT  Ontario-SAN San Diego
4h 11m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:34 pm - 7:04 amSAN  San Diego-ONT Ontario
10h 30m1 stop Las Vegas Harry Reid Intl
$211Frontier
Thu, Oct 22 - Sun, Oct 25
Frontier Logo
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
10:56 am - 7:30 pmSAN  San Diego-ONT Ontario
8h 34m1 stop San Francisco
$216Frontier
Thu, Nov 5 - Sun, Nov 8
Frontier Logo
2:23 pm - 7:47 pmONT  Ontario-SAN San Diego
5h 24m1 stop Las Vegas Harry Reid Intl
Frontier Logo
11:06 am - 10:35 amSAN  San Diego-ONT Ontario
23h 29m2 stops Phoenix Sky Harbor Intl Denver Intl
$218Frontier
Fri, Oct 30 - Tue, Nov 3
Frontier Logo
2:23 pm - 7:47 pmONT  Ontario-SAN San Diego
5h 24m1 stop Las Vegas Harry Reid Intl
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$221Frontier
Fri, Oct 30 - Tue, Nov 3
Frontier Logo
8:35 pm - 1:16 pmONT  Ontario-SAN San Diego
16h 41m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
8:34 pm - 7:04 amSAN  San Diego-ONT Ontario
10h 30m1 stop Las Vegas Harry Reid Intl
$224Frontier
Thu, Oct 22 - Sun, Oct 25

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Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Dec 1
ONT6:00 amOntario
17h 57m
1 stop
SAN11:57 pmSan Diego
Dec 4
SAN7:51 pmSan Diego
27h 32m
1 stop
ONT11:23 pmOntario
$149
Frontier
Dec 1
ONT6:00 amOntario
27h 13m
2 stops
SAN9:13 amSan Diego
Dec 4
SAN6:30 amSan Diego
17h 47m
1 stop
ONT12:17 amOntario
$178
Frontier
Nov 6
ONT8:35 pmOntario
19h 23m
2 stops
SAN3:58 pmSan Diego
Nov 8
SAN10:56 amSan Diego
8h 34m
1 stop
ONT7:30 pmOntario
$197

Southwest flights from Ontario to San Diego

Our best Southwest deals on Ontario to San Diego flight tickets
Southwest
Oct 17
ONT10:35 amOntario
4h 45m
1 stop
SAN3:20 pmSan Diego
Oct 20
SAN4:45 pmSan Diego
3h 40m
1 stop
ONT8:25 pmOntario
$566
Southwest
Oct 17
ONT7:20 amOntario
4h 55m
2 stops
SAN12:15 pmSan Diego
Oct 20
SAN8:15 amSan Diego
3h 45m
1 stop
ONT12:00 pmOntario
$571

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 12/1

6:00 am-11:57 pm

1 stop17h 57m

San Diego

Fri 12/4

7:51 pm-11:23 pm

1 stop27h 32m

$149
Quickest round-trip

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 11/2

2:23 pm-7:47 pm

1 stop5h 24m

San Diego

Tue 11/3

4:53 pm-11:51 pm

1 stop6h 58m

$155

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 12/1

6:00 am-9:13 am

2 stops27h 13m

San Diego

Fri 12/4

6:30 am-12:17 am

1 stop17h 47m

$178

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 11/6

8:35 pm-3:58 pm

2 stops19h 23m

San Diego

Sun 11/8

10:56 am-7:30 pm

1 stop8h 34m

$197

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/5

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Sun 11/8

10:56 am-7:30 pm

1 stop8h 34m

$202

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 10/22

3:38 pm-7:49 pm

1 stop4h 11m

San Diego

Sun 10/25

8:34 pm-7:04 am

1 stop10h 30m

$211

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/5

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Sun 11/8

10:56 am-7:30 pm

1 stop8h 34m

$216

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 10/30

2:23 pm-7:47 pm

1 stop5h 24m

San Diego

Tue 11/3

11:06 am-10:35 am

2 stops23h 29m

$218

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 10/30

2:23 pm-7:47 pm

1 stop5h 24m

San Diego

Tue 11/3

4:53 pm-11:51 pm

1 stop6h 58m

$221

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 10/22

8:35 pm-1:16 pm

2 stops16h 41m

San Diego

Sun 10/25

8:34 pm-7:04 am

1 stop10h 30m

$224

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

$65

Fastest flight time

3h 47m

Direct flights

None
The best one-way flight to San Diego from Ontario in the past 72 hours is $65. The best round-trip flight deal from Ontario to San Diego found on momondo in the last 72 hours is $149.
The fastest flight from Ontario to San Diego takes 3h 47m
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 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.

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
Poway
San Ysidro
Imperial Beach
Santee
Alpine
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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