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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
6:15 am - 3:58 pmONT  Ontario-SAN San Diego
9h 43m1 stop Denver Intl
Frontier Logo
10:28 am - 7:36 pmSAN  San Diego-ONT Ontario
9h 08m1 stop San Francisco
$124Frontier
Sat, Sep 12 - Mon, Sep 14
Frontier Logo
10:04 am - 6:19 pmONT  Ontario-SAN San Diego
8h 15m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:28 am - 7:36 pmSAN  San Diego-ONT Ontario
9h 08m1 stop San Francisco
$141Frontier
Sat, Sep 12 - Mon, Sep 14
Frontier Logo
11:52 am - 11:56 pmONT  Ontario-SAN San Diego
12h 04m1 stop Denver Intl
Frontier Logo
10:27 am - 7:40 pmSAN  San Diego-ONT Ontario
9h 13m1 stop San Francisco
$147Frontier
Wed, Oct 14 - Fri, Oct 16
Frontier Logo
12:07 pm - 6:19 pmONT  Ontario-SAN San Diego
6h 12m1 stop San Francisco
Frontier Logo
4:54 pm - 11:47 pmSAN  San Diego-ONT Ontario
6h 53m1 stop Denver Intl
$148Frontier
Fri, Sep 18 - Sat, Sep 19
Frontier Logo
6:15 am - 11:51 pmONT  Ontario-SAN San Diego
17h 36m1 stop Denver Intl
Frontier Logo
6:25 am - 11:50 pmSAN  San Diego-ONT Ontario
17h 25m1 stop Denver Intl
$152Frontier
Tue, Oct 6 - Tue, Oct 13
Frontier Logo
6:15 am - 11:51 pmONT  Ontario-SAN San Diego
17h 36m1 stop Denver Intl
Frontier Logo
6:25 am - 11:50 pmSAN  San Diego-ONT Ontario
17h 25m1 stop Denver Intl
$153Frontier
Tue, Oct 6 - Tue, Oct 13
Frontier Logo
8:24 pm - 4:59 pmONT  Ontario-SAN San Diego
20h 35m1 stop Las Vegas Harry Reid Intl
Frontier Logo
9:03 pm - 9:09 amSAN  San Diego-ONT Ontario
12h 06m1 stop Las Vegas Harry Reid Intl
$161Frontier
Mon, Sep 21 - Mon, Sep 28
Frontier Logo
10:04 am - 6:06 pmONT  Ontario-SAN San Diego
8h 02m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:27 am - 7:40 pmSAN  San Diego-ONT Ontario
9h 13m1 stop San Francisco
$164Frontier
Wed, Oct 21 - Fri, Oct 23
Frontier Logo
10:04 am - 6:06 pmONT  Ontario-SAN San Diego
8h 02m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
10:27 am - 7:40 pmSAN  San Diego-ONT Ontario
9h 13m1 stop San Francisco
$165Frontier
Wed, Oct 14 - Fri, Oct 16
Frontier Logo
10:04 am - 6:19 pmONT  Ontario-SAN San Diego
8h 15m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
6:25 am - 11:50 pmSAN  San Diego-ONT Ontario
17h 25m1 stop Denver Intl
$166Frontier
Tue, Oct 6 - Tue, Oct 13

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Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
Sep 16
ONT4:27 pmOntario
15h 38m
1 stop
SAN8:05 amSan Diego
Sep 19
SAN7:57 amSan Diego
7h 50m
1 stop
ONT3:47 pmOntario
$243
Alaska Airlines
Oct 2
ONT4:27 pmOntario
20h 03m
1 stop
SAN12:30 pmSan Diego
Oct 5
SAN8:01 amSan Diego
9h 04m
1 stop
ONT5:05 pmOntario
$253
Alaska Airlines
Sep 24
ONT4:27 pmOntario
15h 38m
1 stop
SAN8:05 amSan Diego
Oct 1
SAN9:59 pmSan Diego
17h 48m
1 stop
ONT3:47 pmOntario
$263

Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
Sep 12
ONT6:15 amOntario
9h 43m
1 stop
SAN3:58 pmSan Diego
Sep 14
SAN10:28 amSan Diego
9h 08m
1 stop
ONT7:36 pmOntario
$124
Frontier
Sep 12
ONT10:04 amOntario
8h 15m
2 stops
SAN6:19 pmSan Diego
Sep 14
SAN10:28 amSan Diego
9h 08m
1 stop
ONT7:36 pmOntario
$141
Frontier
Oct 14
ONT11:52 amOntario
12h 04m
1 stop
SAN11:56 pmSan Diego
Oct 16
SAN10:27 amSan Diego
9h 13m
1 stop
ONT7:40 pmOntario
$147

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

Sat 9/12

6:15 am-3:58 pm

1 stop9h 43m

San Diego

Mon 9/14

10:28 am-7:36 pm

1 stop9h 08m

$124

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Sat 9/12

10:04 am-6:19 pm

2 stops8h 15m

San Diego

Mon 9/14

10:28 am-7:36 pm

1 stop9h 08m

$141

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 10/14

11:52 am-11:56 pm

1 stop12h 04m

San Diego

Fri 10/16

10:27 am-7:40 pm

1 stop9h 13m

$147
Quickest round-trip

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Fri 9/18

12:07 pm-6:19 pm

1 stop6h 12m

San Diego

Sat 9/19

4:54 pm-11:47 pm

1 stop6h 53m

$148

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/6

6:15 am-11:51 pm

1 stop17h 36m

San Diego

Tue 10/13

6:25 am-11:50 pm

1 stop17h 25m

$152

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/6

6:15 am-11:51 pm

1 stop17h 36m

San Diego

Tue 10/13

6:25 am-11:50 pm

1 stop17h 25m

$153

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Mon 9/21

8:24 pm-4:59 pm

1 stop20h 35m

San Diego

Mon 9/28

9:03 pm-9:09 am

1 stop12h 06m

$161

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 10/21

10:04 am-6:06 pm

2 stops8h 02m

San Diego

Fri 10/23

10:27 am-7:40 pm

1 stop9h 13m

$164

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Wed 10/14

10:04 am-6:06 pm

2 stops8h 02m

San Diego

Fri 10/16

10:27 am-7:40 pm

1 stop9h 13m

$165

OntarioSan Diego

ONT Ontario - SAN San Diego

ONTSAN

Ontario

Tue 10/6

10:04 am-6:19 pm

2 stops8h 15m

San Diego

Tue 10/13

6:25 am-11:50 pm

1 stop17h 25m

$166

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 $319.

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

4h 09m

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 $124.
The fastest flight from Ontario to San Diego takes 4h 09m
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 09m.

  • 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
Coronado
El Cajon
National City
Julian
La Mesa
Poway
San Ysidro
Imperial Beach
Santee
Borrego Springs
Lemon Grove
Alpine

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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