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Costa Rica

$206+ Cheap flights from Ontario (ONT) to Costa Rica

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
May 23 — May 301
Sat 5/23
Sat 5/30
1 adult, Economy
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Cheap flight deals from Ontario to Costa Rica

Cheapest flights from Ontario to Costa Rica
Explore the most affordable flight options available from Ontario to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 23, 2026.

This American Airlines deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:46 pm
ONT
-
SJO
1 stop8h 13m
American Airlines
Tue 12/156:20 am
SJO
-
ONT
1 stop9h 40m
American Airlines
Deal found 4/23$485
This American Airlines deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:30 am
ONT
-
SJO
2 stops10h 37m
American Airlines
Tue 5/52:08 pm
SJO
-
ONT
1 stop9h 28m
American Airlines
Deal found 4/21$486
This American Airlines deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/811:59 pm
ONT
-
SJO
1 stop12h 27m
American Airlines
Tue 5/122:08 pm
SJO
-
ONT
1 stop9h 32m
American Airlines
Deal found 4/22$494
This American Airlines deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:14 pm
ONT
-
SJO
2 stops18h 03m
American Airlines
Sun 9/131:05 pm
SJO
-
ONT
2 stops25h 22m
American Airlines
Deal found 4/22$504
This American Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:03 pm
ONT
-
SJO
2 stops18h 27m
American Airlines
Mon 10/1912:57 pm
SJO
-
ONT
1 stop23h 51m
American Airlines
Deal found 4/20$509
This Avianca deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Thu 5/283:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 4/21$510
This American Airlines deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1311:59 pm
ONT
-
SJO
2 stops18h 08m
American Airlines
Sun 5/1711:35 pm
SJO
-
ONT
1 stop20h 03m
American Airlines
Deal found 4/21$514
This American Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:59 pm
ONT
-
SJO
2 stops17h 31m
American Airlines
Fri 9/2512:57 pm
SJO
-
ONT
2 stops23h 32m
American Airlines
Deal found 4/20$515
This Super.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Sat 5/93:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 4/20$516
This Super.com deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1911:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Tue 5/263:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 4/19$517
This Southwest deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/34:40 pm
ONT
-
LIR
2 stops17h 10m
Southwest
Sat 7/112:05 pm
LIR
-
ONT
1 stop9h 35m
Southwest
Deal found 4/20$534
This Justfly.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2910:41 pm
ONT
-
LIR
1 stop13h 29m
JetBlue
Wed 6/32:00 pm
LIR
-
ONT
1 stop31h 47m
JetBlue
Deal found 4/20$560

Find flight deals from Ontario to Costa Rica

Keep the following information in mind while searching for Ontario to Costa Rica flight deals. Data was last updated April 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$486
(American Airlines)

One-way from

$206
(KAYAK)

Popular in

December

Cheapest in

October

Average price

$486
Provider with most accurate pricing for Los Angeles Los Angeles-San José Juan Santamaria Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles Los Angeles-San José Juan Santamaria Intl flights.
Search Deals
From Ontario to Costa Rica
Search Deals
One-way flight from Ontario to Costa Rica
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($77 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Costa Rica 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, Cheapflights users made 2,558,603 searches. Data last updated April 23, 2026.
Use the filters below to find and compare flights from Ontario to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 5/3

6:00 am-7:37 pm

1 stop12h 37m

San José Juan Santamaria Intl

Thu 5/14

1:25 pm-9:58 pm

1 stop9h 33m

$654

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/1

1:50 pm-7:15 am

1 stop16h 25m

San José Juan Santamaria Intl

Sat 6/6

6:40 am-8:42 pm

1 stop15h 02m

$654

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/1

1:50 pm-7:15 am

1 stop16h 25m

San José Juan Santamaria Intl

Sun 6/7

8:45 am-10:37 pm

1 stop14h 52m

$654

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 5/6

6:00 am-7:37 pm

1 stop12h 37m

San José Juan Santamaria Intl

Wed 5/13

8:45 am-5:52 pm

1 stop10h 07m

$654

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 5/27

5:00 am-7:37 pm

2 stops13h 37m

San José Juan Santamaria Intl

Sat 5/30

8:45 am-10:50 pm

1 stop15h 05m

$659

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 10/1

1:49 pm-12:21 pm

2 stops21h 32m

San José Juan Santamaria Intl

Fri 10/9

8:45 am-10:59 pm

1 stop15h 14m

$659

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 7/1

6:00 am-7:15 am

1 stop24h 15m

San José Juan Santamaria Intl

Wed 7/8

7:55 am-9:55 pm

1 stop15h 00m

$662

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 5/18

6:00 am-7:15 am

1 stop24h 15m

San José Juan Santamaria Intl

Sat 5/30

8:45 am-10:50 pm

1 stop15h 05m

$662

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 5/23

6:39 pm-9:50 am

2 stops14h 11m

Liberia

Sat 5/30

8:30 am-5:56 pm

1 stop10h 26m

$665

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 5/29

5:00 am-9:15 pm

1 stop15h 15m

San José Juan Santamaria Intl

Thu 7/2

12:30 am-9:55 pm

1 stop22h 25m

$668

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/22

Showing 1-10 of 37 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Costa Rica

Have a flexible travel schedule? Discover the best time to fly to Costa Rica from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Costa Rica

What is the cheapest month to book a flight from Ontario to Costa Rica?

Currently, February is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $119). Flying from Ontario to Costa Rica in July is currently the most expensive (average of $436). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Costa Rica

Get insights into the airlines that provide service to Costa Rica. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Costa Rica. Reviews last updated April 23, 2026.
See what other customers who have flown with United Airlines,American Airlines, andAvianca from Ontario to Costa Rica have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,638 reviews

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,638 reviews
United Airlines
7.4
Good
9,638 reviews

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.1
Good
11,662 reviews
United Airlines
7.4
Good
9,638 reviews

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Avianca
6.5
Okay
2,514 reviews
United Airlines
7.4
Good
9,638 reviews

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Costa Rica. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Costa Rica?

    If you book a flight to Costa Rica from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from Ontario to Costa Rica?

    There are many flights that can get you from Ontario to Costa Rica in 12h 37m. Fly via United Airlines to get the fastest option. Ontario and Costa Rica are separated by a distance of 2685 mi.

  • What are the cheapest airlines to fly from Ontario to Costa Rica one-way?

    To fly one-way, consider booking your trip with Avianca, which is currently one of the cheapest options available, starting at $155. American Airlines flights start at $159 while deals on United Airlines start at $169 one-way.

  • Can I find deals for flights from Ontario to Costa Rica that include hotel bookings?

    Yes. In addition to deals on Ontario to Costa Rica flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Costa Rica?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Costa Rica.

  • Can I find deals for business class flights from Ontario to Costa Rica?

    Yes. Cheapflights offers flight deals from Ontario to Costa Rica by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Costa Rica?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $119). Flying from Ontario to Costa Rica in July is currently the most expensive (average of $436). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Ontario to Costa Rica

Discover the top 3 airlines that operate flights from Ontario to Costa Rica. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$215Average$489FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$349Average$466FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$371Average$545FlexibilityNo cancel feeOn-time71%

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