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Uncover the best deals on Ontario to San Diego flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest ONT - SAN Flights
Useful information for finding best airline tickets from Ontario International to San Diego International on your next trip.
Cheapest Round Trip Flight
$644
Southwest Airlines
• 1 stop
• 7h
Jul 18 – Jul 19
The cheapest round trip flight from Ontario to San Diego (ONT-SAN-ONT) is currently $644
Cheapest Direct Flight
$353
Delta Airlines
• nonstop
• 57m
Jul 18
The cheapest nonstop flight from Ontario to San Diego (ONT-SAN) is currently $353
Fastest Flight
57m
The fastest nonstop flight from Ontario to San Diego (ONT-SAN) takes 57m
Top Airlines Flying from Ontario to San Diego
Latest Flight Deals from Ontario (ONT) to San Diego (SAN)
Compare and book low fare round-trip air tickets from Ontario to San Diego. Ideal for travelers with confirmed return itineraries.
Jul 18 - Jul 19, Economy
Ontario → San Diego
7h
9:20 AM - 1:40 PM • 1 stop
Ontario → San Diego
5h 15m
9:05 AM - 12:20 PM • 1 stop
Southwest Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
5h 55m
6:30 PM - 10:25 PM • 1 stop
Ontario → San Diego
5h 35m
7:40 AM - 11:15 AM • 1 stop
Southwest Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
7h 15m
5:30 AM - 10:05 AM • 1 stop
Ontario → San Diego
5h 25m
11:10 AM - 2:35 PM • 1 stop
Southwest Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
5h 45m
10:00 AM - 1:45 PM • 1 stop
Ontario → San Diego
5h 55m
2:10 PM - 6:05 PM • 1 stop
Southwest Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
6h 45m
1:25 PM - 5:30 PM • 1 stop
Ontario → San Diego
5h 15m
9:05 AM - 12:20 PM • 1 stop
Southwest Airlines
Flying to San Diego soon? We've surfaced some of the most affordable last-minute flights from Ontario to San Diego, ideal for urgent plans or spontaneous trips.
Jul 07 - Jul 14, Economy
Ontario → San Diego
7h 15m
6:30 AM - 11:05 AM • 1 stop
Ontario → San Diego
5h 25m
7:40 PM - 11:05 PM • 1 stop
Southwest Airlines
Jul 07 - Jul 14, Economy
Ontario → San Diego
5h 20m
6:10 AM - 9:30 AM • 1 stop
Ontario → San Diego
5h 20m
8:10 AM - 11:30 AM • 1 stop
Southwest Airlines
Jul 07 - Jul 14, Economy
Ontario → San Diego
5h 30m
12:45 PM - 4:15 PM • 1 stop
Ontario → San Diego
5h 20m
12:10 PM - 3:30 PM • 1 stop
Southwest Airlines
Jul 07 - Jul 14, Economy
Ontario → San Diego
5h 25m
7:20 PM - 10:45 PM • 1 stop
Ontario → San Diego
5h 25m
7:40 PM - 11:05 PM • 1 stop
Southwest Airlines
Jul 07 - Jul 14, Economy
Ontario → San Diego
5h 40m
6:25 PM - 10:05 PM • 1 stop
Ontario → San Diego
5h 25m
4:15 PM - 7:40 PM • 1 stop
Southwest Airlines
Looking for the fastest way to San Diego? These direct flight options from ONT to SAN offer both convenience and value—no layovers, just straight to your destination.
Jul 18 - Jul 19, Economy
Ontario → San Diego
57m
6:20 PM - 7:17 PM • nonstop
Ontario → San Diego
2h
6:15 AM - 7:35 AM • nonstop
Delta Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
1h 42m
8:20 AM - 9:22 AM • nonstop
Ontario → San Diego
2h
6:15 AM - 7:35 AM • nonstop
Delta Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
57m
10:45 PM - 11:42 PM • nonstop
Ontario → San Diego
1h 57m
10:54 AM - 12:11 PM • nonstop
Delta Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
57m
2:11 PM - 3:08 PM • nonstop
Ontario → San Diego
2h
6:15 AM - 7:35 AM • nonstop
Delta Airlines
Jul 18 - Jul 19, Economy
Ontario → San Diego
1h 48m
9:00 AM - 10:08 AM • nonstop
Ontario → San Diego
1h 41m
6:20 AM - 7:21 AM • nonstop
United Airlines
FAQs on Ontario to San Diego Flights
What are the airports in Ontario?
ONT
What’s the most popular airline flying from ONT to SAN?
The most popular airline flying from Ontario to San Diego are
Can I fly from ONT to SAN non-stop?
Yes, you can fly ONT to SAN non-stop on
Which airlines fly nonstop between Ontario and San Diego?
The non-stop flights between Ontario and San Diego are .
What’s the earliest departure time from ONT to SAN Airport?
The earliest flight leaves ONT at 5:30 am and lands in SAN - San Diego International
What are the airports in San Diego?
SAN
Can I make changes to my Ontario to San Diego flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from ONT to SAN?
Read the fare rules of the Ontario to San Diego air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Ontario and San Diego?
operate flights between Ontario and San Diego
How long does a flight from Ontario to San Diego take?
It takes approximately 1 hour to fly non-stop from ONT to SAN, which is 94.18 miles by air.
Which airlines provide the cheapest flights from Ontario (ONT) to San Diego (SAN) ?
In the past couple of days, the cheapest tickets to SAN from ONT were found on WN : USD 644
Do I need a passport to fly between ONT and SAN?
No
What’s the latest departure time from ONT to SAN ?
The last flight leaves ONT at 10:45 pm
Ontario (ONT) to San Diego (SAN): Airport Information
| Origin Airport | Ontario International , Ontario, US |
| Destination Airport | San Diego International , San Diego, US |
| Distance | 94 miles |
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