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$181+ 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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
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Cheap 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 January 15, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$381
(Priceline)

One-way from

$181
(American Airlines)

Popular in

December

Cheapest in

October

Average price

$461
Provider with most accurate pricing for Los Angeles-San José Juan Santamaria Intl flight deals.
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From Ontario to Costa Rica
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One-way flight from Ontario to Costa Rica
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Highest demand for flights based on searches. 15% potential increase in price ($82 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 January 15, 2026.

This American Airlines deal was found by Cheapflights users on 1/14. 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 1/1511:59 pm
ONT
-
SJO
1 stop21h 44m
American Airlines
Wed 1/217:09 am
SJO
-
ONT
2 stops17h 39m
American Airlines
Deal found 1/14$407
This American Airlines deal was found by Cheapflights users on 1/14. 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 5/87:35 pm
ONT
-
SJO
2 stops16h 47m
American Airlines
Tue 5/1212:42 pm
SJO
-
ONT
2 stops20h 57m
American Airlines
Deal found 1/14$409
This American Airlines deal was found by Cheapflights users on 1/15. 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.
Sun 3/17:05 pm
ONT
-
SJO
2 stops17h 48m
American Airlines
Sun 3/811:35 pm
SJO
-
ONT
1 stop25h 24m
American Airlines
Deal found 1/15$412
This Priceline deal was found by Cheapflights users on 1/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2110:30 pm
ONT
-
SJO
1 stop13h 10m
Avianca
Thu 2/269:35 am
SJO
-
ONT
1 stop13h 20m
Avianca
Deal found 1/14$424
This Priceline deal was found by Cheapflights users on 1/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1211:30 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Thu 3/193:05 pm
SJO
-
ONT
1 stop7h 50m
Avianca
Deal found 1/14$435
This American Airlines deal was found by Cheapflights users on 1/13. 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 2/1711:58 pm
ONT
-
SJO
2 stops18h 35m
American Airlines
Tue 2/241:31 pm
SJO
-
ONT
2 stops22h 35m
American Airlines
Deal found 1/13$438
This American Airlines deal was found by Cheapflights users on 1/14. 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 4/911:59 pm
ONT
-
SJO
1 stop12h 23m
American Airlines
Tue 4/1412:42 pm
SJO
-
ONT
2 stops22h 27m
American Airlines
Deal found 1/14$449
This Gotogate deal was found by Cheapflights users on 1/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/511:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Sat 9/193:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 1/14$457
This Priceline deal was found by Cheapflights users on 1/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/310:30 pm
ONT
-
SJO
1 stop13h 10m
Avianca
Tue 2/243:05 pm
SJO
-
ONT
1 stop7h 50m
Avianca
Deal found 1/15$458
This Priceline deal was found by Cheapflights users on 1/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/711:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Sat 5/163:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 1/14$465
This CheapOair deal was found by Cheapflights users on 1/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1211:30 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Tue 3/173:05 pm
SJO
-
ONT
1 stop7h 50m
Avianca
Deal found 1/14$469
This Frontier deal was found by Cheapflights users on 1/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/14:52 pm
ONT
-
SJO
2 stops18h 20m
Frontier
Sat 4/410:06 am
SJO
-
ONT
2 stops14h 50m
Frontier
Deal found 1/15$476

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 January 15, 2026.
Use the filters below to find and compare flights from Ontario to Costa Rica that are best for you.

Fly from

Ontario

Fly to

Costa Rica

Route

Depart

Return

Price

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 5/7

11:35 pm-8:45 am

1 stop8h 10m

San José Juan Santamaria Intl

Sat 5/16

3:10 pm-9:45 pm

1 stop7h 35m

$465

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 2/23

1:50 pm-8:32 am

1 stop16h 42m

San José Juan Santamaria Intl

Thu 2/26

12:35 pm-9:59 pm

1 stop11h 24m

$503

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 2/7

1:53 pm-8:32 am

1 stop16h 39m

San José Juan Santamaria Intl

Tue 3/10

5:30 am-6:07 pm

1 stop13h 37m

$503

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 1/29

6:39 pm-8:32 am

1 stop11h 53m

San José Juan Santamaria Intl

Thu 2/5

9:40 am-10:53 pm

1 stop15h 13m

$503

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 2/1

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

Sat 2/7

8:45 am-9:58 pm

1 stop15h 13m

$503

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 2/25

6:37 pm-8:32 am

1 stop11h 55m

San José Juan Santamaria Intl

Wed 3/4

12:35 pm-9:59 pm

1 stop11h 24m

$503

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 3/2

8:50 pm-2:30 pm

2 stops15h 40m

Liberia

Sat 3/7

1:45 pm-12:25 am

1 stop12h 40m

$510

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 5/8

6:54 pm-7:15 am

1 stop11h 21m

San José Juan Santamaria Intl

Tue 5/12

8:45 am-5:47 pm

1 stop10h 02m

$514

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 3/8

11:59 pm-11:56 am

1 stop10h 57m

San José Juan Santamaria Intl

Thu 3/12

8:40 am-5:41 pm

1 stop10h 01m

$514

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 5/27

6:53 pm-7:15 am

1 stop11h 22m

San José Juan Santamaria Intl

Mon 6/1

8:45 am-5:47 pm

1 stop10h 02m

$514

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 43 results
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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, October is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $152). Flying from Ontario to Costa Rica in December is currently the most expensive (average of $294). 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 January 15, 2026.
See what other customers who have flown with United Airlines, American Airlines, and Avianca 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
9,164 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

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
9,164 reviews
United Airlines
7.4
Good
9,164 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

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
7.2
Good
11,132 reviews
United Airlines
7.4
Good
9,164 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

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
6.6
Okay
2,492 reviews
United Airlines
7.4
Good
9,164 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

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 10h 55m. Fly via Avianca, American Airlines, or United Airlines to get the fastest option. Ontario and Costa Rica are separated by a distance of 2685 mi. This flight may include one or multiple stops.

  • 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, October is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $152). Flying from Ontario to Costa Rica in December is currently the most expensive (average of $294). 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

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Alternative routes for Ontario to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
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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 January 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$280Average$528FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$349Average$563FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$366Average$560FlexibilityNo cancel feeOn-time71%

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