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Cheap flights from Ontario to San José from $194

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San José departing on 8/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to San José

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:50 am - 8:20 am
ONT
-
SJO
44h 30m
2 stops
Frontier Logo
9:35 am - 7:48 pm
SJO
-
ONT
35h 13m
2 stops
$451Frontier
Wed, Aug 19 - Fri, Aug 28
Southwest Logo
8:35 pm - 6:40 pm
ONT
-
SJO
21h 05m
2 stops
Southwest Logo
9:00 am - 9:45 pm
SJO
-
ONT
13h 45m
2 stops
$488Southwest
Sun, Sep 13 - Thu, Sep 24
Frontier Logo
10:50 am - 8:20 am
ONT
-
SJO
44h 30m
2 stops
Frontier Logo
9:35 am - 3:09 pm
SJO
-
ONT
30h 34m
2 stops
$499Frontier
Wed, Aug 19 - Fri, Aug 28
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$509Avianca
Sat, Jun 6 - Thu, Jun 11
Southwest Logo
6:50 am - 6:40 pm
ONT
-
SJO
10h 50m
2 stops
Southwest Logo
1:40 pm - 10:05 pm
SJO
-
ONT
9h 25m
1 stop
$514Southwest
Wed, Aug 19 - Wed, Aug 26
American Airlines Logo
2:22 pm - 11:05 am
ONT
-
SJO
19h 43m
2 stops
American Airlines Logo
12:57 pm - 11:06 pm
SJO
-
ONT
11h 09m
1 stop
$519American Airlines
Fri, Sep 18 - Fri, Sep 25
American Airlines Logo
11:59 pm - 7:52 pm
ONT
-
SJO
18h 53m
2 stops
American Airlines Logo
1:29 pm - 9:34 am
SJO
-
ONT
21h 05m
2 stops
$524American Airlines
Sun, Aug 16 - Sun, Aug 23
United Airlines Logo
6:39 pm - 7:15 am
ONT
-
SJO
11h 36m
1 stop
United Airlines Logo
12:30 am - 12:12 pm
SJO
-
ONT
12h 42m
2 stops
$529United Airlines
Mon, Jun 1 - Fri, Jun 5
American Airlines Logo
2:22 pm - 11:05 am
ONT
-
SJO
19h 43m
2 stops
American Airlines Logo
12:57 pm - 9:29 am
SJO
-
ONT
21h 32m
1 stop
$530American Airlines
Mon, Sep 28 - Mon, Oct 19
Avianca Logo
11:35 pm - 11:30 am
ONT
-
SJO
10h 55m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$533Avianca
Thu, Jun 4 - Thu, Jun 11

Frontier flights from Ontario to San José

Our best Frontier deals on Ontario to San José flight tickets
Frontier
Aug 19
ONT10:50 amOntario
44h 30m
2 stops
SJO8:20 amSan José Juan Santamaria Intl
Aug 28
SJO9:35 amSan José Juan Santamaria Intl
35h 13m
2 stops
ONT7:48 pmOntario
$451
Frontier
Aug 19
ONT10:50 amOntario
44h 30m
2 stops
SJO8:20 amSan José Juan Santamaria Intl
Aug 28
SJO9:35 amSan José Juan Santamaria Intl
30h 34m
2 stops
ONT3:09 pmOntario
$499
Frontier
Aug 15
ONT11:43 amOntario
19h 37m
2 stops
SJO8:20 amSan José Juan Santamaria Intl
Aug 22
SJO9:35 amSan José Juan Santamaria Intl
32h 13m
2 stops
ONT4:48 pmOntario
$560

Avianca flights from Ontario to San José

Our best Avianca deals on Ontario to San José flight tickets
Avianca
Jun 6
ONT11:35 pmOntario
8h 10m
1 stop
SJO8:45 amSan José Juan Santamaria Intl
Jun 11
SJO3:10 pmSan José Juan Santamaria Intl
7h 35m
1 stop
ONT9:45 pmOntario
$509
Avianca
Jun 4
ONT11:35 pmOntario
10h 55m
1 stop
SJO11:30 amSan José Juan Santamaria Intl
Jun 11
SJO3:10 pmSan José Juan Santamaria Intl
7h 35m
1 stop
ONT9:45 pmOntario
$533
Avianca
May 16
ONT11:35 pmOntario
8h 10m
1 stop
SJO8:45 amSan José Juan Santamaria Intl
May 23
SJO3:10 pmSan José Juan Santamaria Intl
7h 35m
1 stop
ONT9:45 pmOntario
$539

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to San José that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated May 8, 2026.
Use the filters below to find and compare flights from Ontario to San José that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 8/19

10:50 am-8:20 am

2 stops44h 30m

San José Juan Santamaria Intl

Fri 8/28

9:35 am-7:48 pm

2 stops35h 13m

$451

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 9/13

8:35 pm-6:40 pm

2 stops21h 05m

San José Juan Santamaria Intl

Thu 9/24

9:00 am-9:45 pm

2 stops13h 45m

$488

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 8/19

10:50 am-8:20 am

2 stops44h 30m

San José Juan Santamaria Intl

Fri 8/28

9:35 am-3:09 pm

2 stops30h 34m

$499
Quickest round-trip

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 6/6

11:35 pm-8:45 am

1 stop8h 10m

San José Juan Santamaria Intl

Thu 6/11

3:10 pm-9:45 pm

1 stop7h 35m

$509

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 8/19

6:50 am-6:40 pm

2 stops10h 50m

San José Juan Santamaria Intl

Wed 8/26

1:40 pm-10:05 pm

1 stop9h 25m

$514

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 9/18

2:22 pm-11:05 am

2 stops19h 43m

San José Juan Santamaria Intl

Fri 9/25

12:57 pm-11:06 pm

1 stop11h 09m

$519

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 8/16

11:59 pm-7:52 pm

2 stops18h 53m

San José Juan Santamaria Intl

Sun 8/23

1:29 pm-9:34 am

2 stops21h 05m

$524

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/1

6:39 pm-7:15 am

1 stop11h 36m

San José Juan Santamaria Intl

Fri 6/5

12:30 am-12:12 pm

2 stops12h 42m

$529

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 9/28

2:22 pm-11:05 am

2 stops19h 43m

San José Juan Santamaria Intl

Mon 10/19

12:57 pm-9:29 am

1 stop21h 32m

$530

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 6/4

11:35 pm-11:30 am

1 stop10h 55m

San José Juan Santamaria Intl

Thu 6/11

3:10 pm-9:45 pm

1 stop7h 35m

$533

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 José from

How to get the cheapest flight ticket from Ontario to San José

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 typical price of a round-trip flight between Ontario and San José?

What is the cheapest month to fly to San José?

In general, October is the cheapest month to fly from Ontario to San José. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $371. If you don’t want to visit San José in October, then you should wait until September to fly from Ontario, when ticket prices are also cheap, with an average price of $390.

What is the cheapest day to depart on your flight to San José?

On average, the least expensive day to fly to San José from Ontario is on a Thursday. momondo users have found tickets for Thursday departures for as low as $477. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from Ontario to San José on a Sunday will generally be more expensive and average around $523. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to San José?

Our data shows that the cheapest Ontario to San José flights are usually those with departure times in the morning. Our users have found flights to San José in the morning for as low as $432. Flights in the afternoon are often more expensive with an average ticket price of $532.

Can stopping save me money on Ontario to San José flights?

You could potentially save up to 26% on your flight if you consider stops on a Ontario to San José flight.

How have Ontario to San José flight prices changed over time?

As of May 2026, prices for Ontario to San José flights are approximately 22% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to San José

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to San José according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to San José (ONT to SJO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San José

Fastest flight time

7h 40m

Direct flights

None
The fastest flight from Ontario to San José takes 7h 40m
There are no direct flights from Ontario to San José. There are no popular flight routes from Ontario to San José.
Search flight deals

Frequently asked questions about flying from Ontario to San José

  • How far is Ontario to San José Juan Santamaria Intl by plane?

    The distance between Ontario and San José Juan Santamaria Intl is about 2696.0 mi. Typically, this will take 7h 40m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to San José Juan Santamaria Intl Airport?

    Prices for flights from Ontario Airport to San José Juan Santamaria Intl Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to San José Juan Santamaria Intl Airport?

  • How old do you have to be to fly from Ontario Airport to San José Juan Santamaria Intl 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 José Juan Santamaria Intl Airport.

  • What documentation or ID do you need to fly to San José Juan Santamaria Intl Airport?

    The necessary travel and health documents for your San José Juan Santamaria Intl 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.

  • What is the most popular airline from Ontario to San José?

Best airlines flying from Ontario to San José

Compare and see reviews for airlines that fly from Ontario to San José with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $190Free CancellationRating
7.4
9,693 reviews
Search United Airlines flights
American AirlinesPriceFrom $356Free CancellationRating
7.1
11,670 reviews
Search American Airlines flights
AviancaPriceFrom $404Free CancellationRating
6.5
2,522 reviews
Search Avianca flights

Traveling to a place near San José?

Book flights to San José if you plan to visit one of these locations
Manuel Antonio
Jacó
Monteverde
Alajuela
Heredia
Santa Elena
Dominical
San Gerardo de Dota
Esterillos Este

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San José?

It is quick and easy to find Ontario to San José flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San José that suits you.

Can I find flights from Ontario to San José with flexible booking policies on momondo?

Flights from Ontario to San José with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to San José?

momondo helps you find the best flight between Ontario and San José by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to San José right now. Can momondo alert me if prices change?

Price alerts on flights to San José from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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