Cheap flights from Ontario to San Diego (ONT - SAN)

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How to find the cheapest flight from
Ontario (ONT) to San Diego (SAN)

All the information you need to plan the best ONT to SAN flight in 2021: compare Ontario to San Diego flight prices with the expected peak season, weather and rainfall in San Diego.
What is the cheapest month to fly from Ontario to San Diego?

The best pricing can be found in the month of April. Prices to San Diego from Ontario average $154. You can even find prices in April for less than $154, as users have found deals to San Diego from as low as $75. The month of September appears to be one of the more expensive times to travel to San Diego from Ontario. Flying in the targeted month can save you up to 36%.

How far in advance should I book a flight from Ontario to San Diego?

Find a great deal and save up to 60% by booking at least 43 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Ontario to San Diego within the next two weeks, with the cheapest ticket starting at $173.

When is the cheapest time to fly from Ontario to San Diego (ONT - SAN)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to San Diego as you normally would.

Cheap flights from Ontario to San Diego in October, November 2021

The best prices found for ONT to SAN flights for October, November
26 Oct - 2 Nov
$208pp
ONT
Ontario
Frontier
 
1 STOP
SAN
San Diego
SAN
San Diego
Frontier
 
1 STOP
ONT
Ontario
30 Oct - 3 Nov
$209pp
ONT
Ontario
Multiple Airlines
 
1 STOP
SAN
San Diego
SAN
San Diego
Multiple Airlines
 
1 STOP
ONT
Ontario
30 Oct - 3 Nov
$228pp
ONT
Ontario
Multiple Airlines
   
2 STOPS
SAN
San Diego
SAN
San Diego
Multiple Airlines
 
1 STOP
ONT
Ontario

Ontario to San Diego 2021 flight deals

Cheap flights to San Diego from Ontario found for this year
2 Dec - 9 Dec
$202pp
ONT
Ontario
Frontier
 
1 STOP
SAN
San Diego
SAN
San Diego
Frontier
 
1 STOP
ONT
Ontario
26 Oct - 2 Nov
$208pp
ONT
Ontario
Frontier
 
1 STOP
SAN
San Diego
SAN
San Diego
Frontier
 
1 STOP
ONT
Ontario
30 Oct - 3 Nov
$209pp
ONT
Ontario
Multiple Airlines
 
1 STOP
SAN
San Diego
SAN
San Diego
Multiple Airlines
 
1 STOP
ONT
Ontario

Non-stop flights to San Diego from Ontario

Save time with Ontario to San Diego direct flight deals
2 Dec - 9 Dec
$2,748pp
ONT
Ontario
Linear Air Taxi
Non-Stop
SAN
San Diego
SAN
San Diego
Linear Air Taxi
Non-Stop
ONT
Ontario
17 Dec - 26 Dec
$2,807pp
ONT
Ontario
Linear Air Taxi
Non-Stop
SAN
San Diego
SAN
San Diego
Linear Air Taxi
Non-Stop
ONT
Ontario
25 Nov - 28 Nov
$3,059pp
ONT
Ontario
Linear Air Taxi
Non-Stop
SAN
San Diego
SAN
San Diego
Linear Air Taxi
Non-Stop
ONT
Ontario

Last minute flights from Ontario to San Diego

Late deals on round-trip flights to San Diego from Ontario, departing today and this week
26 Oct - 2 Nov
$208pp
ONT
Ontario
Frontier
 
1 STOP
SAN
San Diego
SAN
San Diego
Frontier
 
1 STOP
ONT
Ontario
30 Oct - 3 Nov
$209pp
ONT
Ontario
Multiple Airlines
 
1 STOP
SAN
San Diego
SAN
San Diego
Multiple Airlines
 
1 STOP
ONT
Ontario
30 Oct - 3 Nov
$228pp
ONT
Ontario
Multiple Airlines
   
2 STOPS
SAN
San Diego
SAN
San Diego
Multiple Airlines
 
1 STOP
ONT
Ontario

One-way flights to San Diego from Ontario

The cheapest one-way flights from Ontario to San Diego
3:57 pm - 3:45 am
Alaska Airlines
1 Stop
11h 48m
ONT - SAN
Alaska Airlines
$121
mytrip.com
1:00 am - 5:28 pm
United Airlines
1 Stop
17h 28m
ONT - SAN
United Airlines
$145
United
12:31 pm - 7:28 am
Frontier
2 Stops
18h 57m
ONT - SAN
Frontier
$154
CheapOair

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Ontario</span> to <span class="emphasized">San Diego</span> flights.

Flight FAQs

From Ontario to San Diego

Which airlines flying from Ontario to San Diego have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like American Airlines, Linear Air Taxi, and United Airlines flying from Ontario to San Diego have implemented new flexible cancellation policies.

Can I find flights from Ontario to San Diego for under $300 on Cheapflights?

Yes, there are multiple flights from Ontario to San Diego for under $300. The cheapest flight booked recently is on Frontier for just $202, but on average you can expect to pay $246.

Are there nonstop flights from Ontario to San Diego for under $2,800 on Cheapflights?

Cheapflights has at least 3 direct flights from Ontario to San Diego under $2,800. A good price for a nonstop flight from Ontario to San Diego is less than $2,871.

Are there last-minute flights available from Ontario to San Diego for under $300?

There are currently 15+ open flights from Ontario to San Diego within the next 7 days for less than $300.

What are the cheapest airlines to fly from Ontario to San Diego one-way?

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $90. Alaska Airlines flights start at $106 while deals on United Airlines start at $117 one-way.

What are the cheapest flights from Ontario to San Diego?

Looking for the cheapest flight from Ontario to San Diego? While on average our users pay $776, our data indicates the cheapest price to be $363. The most popular route (Ontario - San Diego), is priced around $206.

What are the most popular airlines that fly from Ontario to San Diego?

The most popular airlines flying from Ontario to San Diego are American Airlines, Linear Air Taxi and United Airlines. Something to consider prior to booking your flight.

COVID Restrictions

View COVID Travel Restrictions for San Diego, CA

Do I need a COVID test to fly to San Diego from Ontario?

Information is based on travel restrictions for travel to San Diego within the United States

Most visitors from Ontario need to provide a negative COVID-19 test result and/or quarantine to enter San Diego.

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to San Diego.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering San Diego.

Do I need a test to fly back to Ontario from San Diego?

Returning to Ontario from San Diego

COVID-19 testing requirements
Visitors from San Diego must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Ontario.

Quarantine requirements
Visitors from San Diego are not required to quarantine after entering Ontario.

Hide COVID Travel Restrictions for San Diego, CA

Alternative routes for Ontario to San Diego

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for San Diego

Things to know before you go - useful duration and weather info for your trip from Ontario to San Diego.
Average temperature for October in San Diego
77.0 °F
Avg rainfall for October in San Diego
0.6 ″

Airports servicing Ontario

Airports servicing San Diego

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