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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
$258
Southwest Airlines
• 1 stop
• 7h 10m
Sep 17 – Sep 18
The cheapest round trip flight from Ontario to San Diego (ONT-SAN-ONT) is currently $258
Cheapest Direct Flight
$517
United Airlines
• nonstop
• 56m
Sep 17
The cheapest nonstop flight from Ontario to San Diego (ONT-SAN) is currently $517
Fastest Flight
56m
The fastest nonstop flight from Ontario to San Diego (ONT-SAN) takes 56m
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.
Sep 17 - Sep 18, Economy
Ontario → San Diego
7h 10m
10:30 AM - 3:00 PM • 1 stop
Ontario → San Diego
5h 10m
6:40 PM - 9:50 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
5h 30m
5:45 PM - 9:15 PM • 1 stop
Ontario → San Diego
5h 45m
4:10 PM - 7:55 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
7h 5m
5:45 PM - 10:10 PM • 1 stop
Ontario → San Diego
5h 15m
2:45 PM - 6:00 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
5h 55m
10:55 AM - 2:50 PM • 1 stop
Ontario → San Diego
5h 45m
1:20 PM - 5:05 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
7h 15m
6:30 AM - 11:05 AM • 1 stop
Ontario → San Diego
5h 10m
6:40 PM - 9:50 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.
Sep 17 - Sep 18, Economy
Ontario → San Diego
7h 10m
10:30 AM - 3:00 PM • 1 stop
Ontario → San Diego
5h 10m
6:40 PM - 9:50 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
5h 30m
5:45 PM - 9:15 PM • 1 stop
Ontario → San Diego
5h 45m
4:10 PM - 7:55 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
7h 5m
5:45 PM - 10:10 PM • 1 stop
Ontario → San Diego
5h 15m
2:45 PM - 6:00 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
5h 55m
10:55 AM - 2:50 PM • 1 stop
Ontario → San Diego
5h 45m
1:20 PM - 5:05 PM • 1 stop
Southwest Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
7h 15m
6:30 AM - 11:05 AM • 1 stop
Ontario → San Diego
5h 10m
6:40 PM - 9:50 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.
Sep 17 - Sep 18, Economy
Ontario → San Diego
56m
4:30 PM - 5:26 PM • nonstop
Ontario → San Diego
1h 43m
2:24 PM - 3:27 PM • nonstop
United Airlines
Sep 18 - Sep 19, Economy
Ontario → San Diego
56m
7:06 PM - 8:02 PM • nonstop
Ontario → San Diego
1h 43m
6:15 AM - 7:18 AM • nonstop
United Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
56m
7:06 PM - 8:02 PM • nonstop
Ontario → San Diego
1h 43m
6:15 AM - 7:18 AM • nonstop
United Airlines
Sep 18 - Sep 19, Economy
Ontario → San Diego
56m
4:30 PM - 5:26 PM • nonstop
Ontario → San Diego
1h 43m
2:24 PM - 3:27 PM • nonstop
United Airlines
Sep 17 - Sep 18, Economy
Ontario → San Diego
1h 40m
10:35 AM - 11:35 AM • nonstop
Ontario → San Diego
1h 43m
2:24 PM - 3:27 PM • 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 6:30 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 258
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 7:06 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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