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Cheap flights from Ontario to San Diego from $49

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
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
10:56 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 32m1 stop San Francisco
$123Frontier
Thu, Nov 5 - Mon, Nov 9
Frontier Logo
10:35 am - 6:38 pmONT  Ontario-SAN San Diego
8h 03m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:56 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 32m1 stop San Francisco
$134Frontier
Tue, Nov 3 - Thu, Nov 5
Frontier Logo
10:35 am - 6:38 pmONT  Ontario-SAN San Diego
8h 03m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:56 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 32m1 stop San Francisco
$143Frontier
Wed, Nov 4 - Thu, Nov 5
Frontier Logo
5:07 pm - 6:38 pmONT  Ontario-SAN San Diego
25h 31m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:48 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 40m1 stop San Francisco
$144Frontier
Tue, Oct 27 - Thu, Oct 29
Frontier Logo
6:25 am - 3:58 pmONT  Ontario-SAN San Diego
9h 33m1 stop Denver Intl
Frontier Logo
10:56 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 32m1 stop San Francisco
$147Frontier
Tue, Nov 3 - Thu, Nov 5
Frontier Logo
6:25 am - 3:58 pmONT  Ontario-SAN San Diego
9h 33m1 stop Denver Intl
Frontier Logo
10:48 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 40m1 stop San Francisco
$159Frontier
Tue, Oct 27 - Thu, Oct 29
Frontier Logo
12:01 pm - 8:37 amONT  Ontario-SAN San Diego
20h 36m2 stops San Francisco Dallas/Fort Worth
Frontier Logo
10:56 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 32m1 stop San Francisco
$160Frontier
Thu, Nov 5 - Mon, Nov 9
Frontier Logo
11:52 am - 11:57 pmONT  Ontario-SAN San Diego
12h 05m1 stop Denver Intl
Frontier Logo
10:56 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 32m1 stop San Francisco
$168Frontier
Wed, Nov 4 - Thu, Nov 5
Frontier Logo
11:26 am - 1:16 pmONT  Ontario-SAN San Diego
25h 50m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:56 am - 9:40 amSAN  San Diego-ONT Ontario
22h 44m2 stops San Francisco Las Vegas Harry Reid Intl
$174Frontier
Tue, Oct 20 - Tue, Oct 27
Frontier Logo
5:25 pm - 1:16 pmONT  Ontario-SAN San Diego
19h 51m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:48 am - 7:28 pmSAN  San Diego-ONT Ontario
8h 40m1 stop San Francisco
$175Frontier
Tue, Oct 20 - Thu, Oct 29

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Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Nov 5
ONT12:01 pmOntario
6h 37m
1 stop
SAN6:38 pmSan Diego
Nov 9
SAN10:56 amSan Diego
8h 32m
1 stop
ONT7:28 pmOntario
$123
Frontier
Nov 3
ONT10:35 amOntario
8h 03m
2 stops
SAN6:38 pmSan Diego
Nov 5
SAN10:56 amSan Diego
8h 32m
1 stop
ONT7:28 pmOntario
$134
Frontier
Oct 27
ONT5:07 pmOntario
25h 31m
2 stops
SAN6:38 pmSan Diego
Oct 29
SAN10:48 amSan Diego
8h 40m
1 stop
ONT7:28 pmOntario
$144

momondo Fare Finder

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

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Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/5

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Mon 11/9

10:56 am-7:28 pm

1 stop8h 32m

$123

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 11/3

10:35 am-6:38 pm

2 stops8h 03m

San Diego

Thu 11/5

10:56 am-7:28 pm

1 stop8h 32m

$134

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 11/4

10:35 am-6:38 pm

2 stops8h 03m

San Diego

Thu 11/5

10:56 am-7:28 pm

1 stop8h 32m

$143

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/27

5:07 pm-6:38 pm

2 stops25h 31m

San Diego

Thu 10/29

10:48 am-7:28 pm

1 stop8h 40m

$144

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 11/3

6:25 am-3:58 pm

1 stop9h 33m

San Diego

Thu 11/5

10:56 am-7:28 pm

1 stop8h 32m

$147

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/27

6:25 am-3:58 pm

1 stop9h 33m

San Diego

Thu 10/29

10:48 am-7:28 pm

1 stop8h 40m

$159

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Thu 11/5

12:01 pm-8:37 am

2 stops20h 36m

San Diego

Mon 11/9

10:56 am-7:28 pm

1 stop8h 32m

$160

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 11/4

11:52 am-11:57 pm

1 stop12h 05m

San Diego

Thu 11/5

10:56 am-7:28 pm

1 stop8h 32m

$168

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/20

11:26 am-1:16 pm

2 stops25h 50m

San Diego

Tue 10/27

10:56 am-9:40 am

2 stops22h 44m

$174

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/20

5:25 pm-1:16 pm

2 stops19h 51m

San Diego

Thu 10/29

10:48 am-7:28 pm

1 stop8h 40m

$175

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 Wednesday. Travelers who choose to depart for San Diego on a Wednesday will often find tickets for as low as $240. 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 $259. 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

$49

Fastest flight time

4h 00m

Direct flights

None
The best one-way flight to San Diego from Ontario in the past 72 hours is $49. The best round-trip flight deal from Ontario to San Diego found on momondo in the last 72 hours is $123.
The fastest flight from Ontario to San Diego takes 4h 00m
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 4h 00m.

  • 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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