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Cheap flights from Ontario to San Diego from $51

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
$147Frontier
Mon, Nov 16 - Thu, Nov 19
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
$173Frontier
Fri, Nov 13 - Thu, Nov 19
Frontier Logo
10:04 am - 6:19 pmONT  Ontario-SAN San Diego
8h 15m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
5:54 pm - 4:30 pmSAN  San Diego-ONT Ontario
22h 36m1 stop Las Vegas Harry Reid Intl
$176Frontier
Wed, Sep 30 - Wed, Oct 7
Frontier Logo
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$181Frontier
Mon, Nov 16 - Tue, Nov 17
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
6:25 am - 11:47 pmSAN  San Diego-ONT Ontario
17h 22m1 stop Denver Intl
$186Frontier
Wed, Sep 30 - Wed, Oct 7
Frontier Logo
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$189Frontier
Mon, Nov 2 - Sat, Nov 7
Frontier Logo
11:52 am - 11:56 pmONT  Ontario-SAN San Diego
12h 04m1 stop Denver Intl
Frontier Logo
3:14 pm - 7:40 pmSAN  San Diego-ONT Ontario
4h 26m1 stop San Francisco
$194Frontier
Wed, Oct 14 - Thu, Oct 22
Frontier Logo
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$204Frontier
Mon, Nov 2 - Thu, Nov 5
Frontier Logo
12:01 pm - 6:38 pmONT  Ontario-SAN San Diego
6h 37m1 stop San Francisco
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$207Frontier
Fri, Nov 13 - Tue, Nov 17
Frontier Logo
12:07 pm - 6:09 pmONT  Ontario-SAN San Diego
6h 02m1 stop San Francisco
Frontier Logo
6:54 pm - 4:59 pmSAN  San Diego-ONT Ontario
22h 05m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
$213Frontier
Fri, Oct 2 - Sun, Oct 4

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Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Nov 16
ONT12:01 pmOntario
6h 37m
1 stop
SAN6:38 pmSan Diego
Nov 19
SAN10:56 amSan Diego
8h 32m
1 stop
ONT7:28 pmOntario
$147
Frontier
Nov 13
ONT12:01 pmOntario
6h 37m
1 stop
SAN6:38 pmSan Diego
Nov 19
SAN10:56 amSan Diego
8h 32m
1 stop
ONT7:28 pmOntario
$173
Frontier
Sep 30
ONT10:04 amOntario
8h 15m
2 stops
SAN6:19 pmSan Diego
Oct 7
SAN5:54 pmSan Diego
22h 36m
1 stop
ONT4:30 pmOntario
$176

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
Oct 6
ONT11:13 amOntario
6h 39m
1 stop
SAN5:52 pmSan Diego
Oct 20
SAN6:15 amSan Diego
7h 01m
1 stop
ONT1:16 pmOntario
$243
Alaska Airlines
Oct 15
ONT5:45 pmOntario
14h 25m
1 stop
SAN8:10 amSan Diego
Oct 26
SAN8:01 amSan Diego
9h 04m
1 stop
ONT5:05 pmOntario
$273
Alaska Airlines
Oct 7
ONT5:45 pmOntario
14h 25m
1 stop
SAN8:10 amSan Diego
Oct 12
SAN8:01 amSan Diego
9h 04m
1 stop
ONT5:05 pmOntario
$310

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

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 11/16

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Thu 11/19

10:56 am-7:28 pm

1 stop8h 32m

$147

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 11/13

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Thu 11/19

10:56 am-7:28 pm

1 stop8h 32m

$173

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 9/30

10:04 am-6:19 pm

2 stops8h 15m

San Diego

Wed 10/7

5:54 pm-4:30 pm

1 stop22h 36m

$176
Quickest round-trip

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 11/16

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Tue 11/17

4:53 pm-11:51 pm

1 stop6h 58m

$181

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 9/30

10:04 am-4:59 pm

1 stop6h 55m

San Diego

Wed 10/7

6:25 am-11:47 pm

1 stop17h 22m

$186

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 11/2

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Sat 11/7

4:53 pm-11:51 pm

1 stop6h 58m

$189

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 10/14

11:52 am-11:56 pm

1 stop12h 04m

San Diego

Thu 10/22

3:14 pm-7:40 pm

1 stop4h 26m

$194

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 11/2

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Thu 11/5

4:53 pm-11:51 pm

1 stop6h 58m

$204

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 11/13

12:01 pm-6:38 pm

1 stop6h 37m

San Diego

Tue 11/17

4:53 pm-11:51 pm

1 stop6h 58m

$207

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 10/2

12:07 pm-6:09 pm

1 stop6h 02m

San Diego

Sun 10/4

6:54 pm-4:59 pm

2 stops22h 05m

$213

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 $239. 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 morning when flights can be purchased for as low as $253. Flights at noon are often more expensive with an average ticket price of $359.

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

$51

Fastest flight time

3h 55m

Direct flights

None
The best one-way flight to San Diego from Ontario in the past 72 hours is $51. The best round-trip flight deal from Ontario to San Diego found on momondo in the last 72 hours is $147.
The fastest flight from Ontario to San Diego takes 3h 55m
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 55m.

  • 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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