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Costa Rica

$156+ 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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
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 December 4, 2025.

This United Airlines deal was found by Cheapflights users on 12/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:00 amONT - SJO
2 stops12h 39mUnited Airlines
Tue 12/92:20 pmSJO - ONT
1 stop9h 29mUnited Airlines
Deal found 12/4$372
This American Airlines deal was found by Cheapflights users on 12/2. 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.
Sat 12/610:47 amONT - SJO
1 stop8h 24mAmerican Airlines
Wed 12/107:00 amSJO - ONT
2 stops14h 39mAmerican Airlines
Deal found 12/2$376
This American Airlines deal was found by Cheapflights users on 12/3. 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 12/77:03 amONT - SJO
1 stop13h 56mAmerican Airlines
Sat 12/136:20 amSJO - ONT
1 stop13h 57mAmerican Airlines
Deal found 12/3$412
This United Airlines deal was found by Cheapflights users on 12/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/111:50 pmONT - SJO
1 stop16h 42mUnited Airlines
Tue 12/169:40 amSJO - ONT
1 stop15h 09mUnited Airlines
Deal found 12/4$433
This Priceline deal was found by Cheapflights users on 12/3. 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 12/610:30 pmONT - SJO
1 stop8h 10mAvianca
Tue 12/163:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 12/3$435
This American Airlines deal was found by Cheapflights users on 12/3. 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.
Sat 12/66:00 amONT - SJO
1 stop13h 11mAmerican Airlines
Fri 12/126:20 amSJO - ONT
1 stop13h 57mAmerican Airlines
Deal found 12/3$447
This American Airlines deal was found by Cheapflights users on 12/4. 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 12/96:17 amONT - SJO
2 stops14h 11mAmerican Airlines
Sat 12/136:00 amSJO - ONT
2 stops14h 17mAmerican Airlines
Deal found 12/4$456
This American Airlines deal was found by Cheapflights users on 12/4. 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 12/106:17 amONT - SJO
2 stops14h 11mAmerican Airlines
Sun 12/147:00 amSJO - ONT
2 stops18h 55mAmerican Airlines
Deal found 12/4$461
This United Airlines deal was found by Cheapflights users on 12/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2011:59 pmONT - LIR
1 stop12h 41mUnited Airlines
Wed 12/248:35 amLIR - ONT
1 stop15h 17mUnited Airlines
Deal found 12/2$750
This United Airlines deal was found by Cheapflights users on 12/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/231:40 pmONT - LIR
2 stops19h 44mUnited Airlines
Fri 12/268:35 amLIR - ONT
1 stop15h 17mUnited Airlines
Deal found 12/4$754
This United Airlines deal was found by Cheapflights users on 12/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:04 amONT - LIR
1 stop10h 33mUnited Airlines
Thu 12/2512:50 pmLIR - ONT
1 stop25h 48mUnited Airlines
Deal found 12/3$760
This Delta deal was found by Cheapflights users on 12/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1110:25 pmONT - LIR
1 stop12h 15mDelta
Tue 12/162:05 pmLIR - ONT
1 stop10h 59mDelta
Deal found 12/3$777

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 December 4, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$304
(American Airlines)

One-way from

$156
(American Airlines)

Popular in

December

Cheapest in

October

Average price

$751
Provider with most accurate pricing for Los Angeles-San José Juan Santamaria Intl flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-San José Juan Santamaria Intl flights.
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From Ontario to Costa Rica
Search Deals
One-way flight from Ontario to Costa Rica
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($110 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 December 4, 2025.
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

Wed 3/4

8:00 am-8:39 pm

1 stop10h 39m

San José Juan Santamaria Intl

Tue 3/10

8:40 am-5:41 pm

1 stop10h 01m

$414

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 1/26

1:53 pm-8:32 am

1 stop16h 39m

San José Juan Santamaria Intl

Tue 2/3

9:40 am-10:53 pm

1 stop15h 13m

$414

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 1/12

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

$414

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 1/20

1:53 pm-8:32 am

1 stop16h 39m

San José Juan Santamaria Intl

Mon 1/26

9:40 am-5:43 pm

1 stop10h 03m

$444

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 1/26

6:00 am-6:16 pm

1 stop10h 16m

San José Juan Santamaria Intl

Mon 2/2

9:40 am-5:43 pm

1 stop10h 03m

$444

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 1/19

6:00 am-6:16 pm

1 stop10h 16m

San José Juan Santamaria Intl

Tue 1/27

9:40 am-10:53 pm

1 stop15h 13m

$448

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 1/30

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

Fri 2/6

6:30 am-10:53 pm

2 stops18h 23m

$448

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 2/28

1:53 pm-8:32 am

1 stop16h 39m

San José Juan Santamaria Intl

Tue 3/10

5:30 am-10:57 pm

2 stops18h 27m

$452

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 1/28

8:00 am-8:39 pm

1 stop10h 39m

San José Juan Santamaria Intl

Sat 1/31

6:30 am-9:58 pm

1 stop17h 28m

$469

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Wed 1/7

8:00 am-6:37 pm

1 stop8h 37m

Liberia

Wed 1/14

2:20 pm-9:58 pm

1 stop9h 38m

$525

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

Showing 1-10 of 36 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 $298). 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.

What is the cheapest time of day to fly from ONT to CR?

Find hourly flight availability from Ontario to Costa Rica. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 4, 2025.

One of the essential ways to save on airfare from Ontario to Costa Rica is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 29% on airfare.

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 December 4, 2025.
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
9,066 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Entertainment

7.1

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
9,066 reviews
United Airlines
7.4
Good
9,066 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Entertainment

7.1

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
11,046 reviews
United Airlines
7.4
Good
9,066 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Entertainment

7.1

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
2,479 reviews
United Airlines
7.4
Good
9,066 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Entertainment

7.1

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 39m. 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 American Airlines, which is currently one of the cheapest options available, starting at $159. United Airlines flights start at $159 while deals on Southwest start at $216 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 $298). 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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$351Average$609FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$366Average$585FlexibilityNo cancel feeOn-time71%
AviancaCheapest$413Average$528FlexibilityNo cancel feeOn-time71%

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