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$163+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$352
(United Airlines)

One-way from

$163
(American Airlines)

Popular in

December

Cheapest in

May

Average price

$513
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. 17% potential increase in price ($99 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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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 June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/10. 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 8/166:39 pmONT - SJO
1 stop11h 36mUnited Airlines
Fri 8/227:55 amSJO - ONT
1 stop14h 30mUnited Airlines
Deal found 6/10$352
This American Airlines deal was found by Cheapflights users on 6/11. 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 6/126:10 amONT - SJO
1 stop14h 54mAmerican Airlines
Thu 6/1911:59 pmSJO - ONT
1 stop24h 03mAmerican Airlines
Deal found 6/11$360
This CheapOair deal was found by Cheapflights users on 6/11. 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 11/271:04 amONT - SJO
1 stop20h 49mMultiple Airlines
Sun 12/74:13 pmSJO - ONT
1 stop9h 01mMultiple Airlines
Deal found 6/11$362
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/311:25 pmONT - SJO
1 stop10h 50mAvianca
Thu 8/79:35 amSJO - ONT
1 stop13h 20mAvianca
Deal found 6/10$451
This American Airlines deal was found by Cheapflights users on 6/12. 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 8/162:57 pmONT - LIR
2 stops19h 38mAmerican Airlines
Sat 8/2312:45 pmLIR - ONT
2 stops23h 47mAmerican Airlines
Deal found 6/12$551
This Delta deal was found by Cheapflights users on 6/9. 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.
Sun 8/310:05 pmONT - LIR
1 stop12h 55mDelta
Tue 8/121:25 pmLIR - ONT
1 stop9h 55mDelta
Deal found 6/9$561
This Delta deal was found by Cheapflights users on 6/10. 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.
Wed 9/1710:59 pmONT - SJO
1 stop11h 54mDelta
Fri 9/261:18 pmSJO - ONT
1 stop10h 23mDelta
Deal found 6/10$576
This Alaska Airlines deal was found by Cheapflights users on 6/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/37:10 amONT - LIR
2 stops22h 10mAlaska Airlines
Sat 10/1110:00 amLIR - ONT
2 stops24h 57mAlaska Airlines
Deal found 6/11$622
This Southwest deal was found by Cheapflights users on 6/11. 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 8/15:15 amONT - SJO
2 stops13h 25mSouthwest
Sat 8/212:00 pmSJO - ONT
2 stops12h 10mSouthwest
Deal found 6/11$629
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/315:05 amONT - LIR
1 stop9h 20mUnited Airlines
Wed 8/611:05 amLIR - ONT
1 stop11h 32mUnited Airlines
Deal found 6/11$647
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1011:25 pmONT - LIR
3 stops31h 20mMultiple Airlines
Thu 7/176:50 amLIR - ONT
2 stops16h 05mMultiple Airlines
Deal found 6/10$1,094
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/205:10 amONT - LIR
2 stops29h 50mAir Canada
Sat 6/281:00 pmLIR - ONT
2 stops29h 25mAir Canada
Deal found 6/10$1,381

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 June 12, 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

Sat 8/16

6:39 pm-7:15 am

1 stop11h 36m

San José Juan Santamaria Intl

Fri 8/22

7:55 am-9:25 pm

1 stop14h 30m

$352

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 9/1

11:59 pm-8:15 pm

2 stops19h 16m

San José Juan Santamaria Intl

Sun 9/7

6:00 am-11:59 pm

2 stops18h 59m

$361

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 11/27

1:04 am-11:53 pm

1 stop20h 49m

San José Juan Santamaria Intl

Sun 12/7

4:13 pm-11:14 pm

1 stop9h 01m

$362

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 8/3

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Thu 8/7

9:35 am-9:55 pm

1 stop13h 20m

$451

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sun 7/6

12:59 am-2:45 pm

1 stop12h 46m

Liberia

Thu 7/10

3:45 pm-11:54 pm

1 stop9h 09m

$548

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sun 8/3

10:05 pm-12:00 pm

1 stop12h 55m

Liberia

Tue 8/12

1:25 pm-10:20 pm

1 stop9h 55m

$554

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 9/17

10:59 pm-11:53 am

1 stop11h 54m

San José Juan Santamaria Intl

Fri 9/26

1:18 pm-10:41 pm

1 stop10h 23m

$576

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 8/1

5:15 am-7:40 pm

2 stops13h 25m

San José Juan Santamaria Intl

Sat 8/2

12:00 pm-11:10 pm

2 stops12h 10m

$629

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sun 8/3

6:00 am-2:23 pm

1 stop7h 23m

Liberia

Tue 8/12

11:05 am-10:52 pm

2 stops12h 47m

$640

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 7/7

6:58 pm-3:53 pm

3 stops19h 55m

Liberia

Thu 7/10

10:00 am-11:59 pm

2 stops14h 59m

$660

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 23 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, September is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $398). Flying from Ontario to Costa Rica in March is currently the most expensive (average of $555). 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 June 12, 2025.

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

Rainfall in Costa Rica by month

Plan your trip to Costa Rica by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Costa Rica ranges from 0.0 - 11.8 inches per month. September is typically the wettest month, when rainfall can reach 11.8 in. February is typically the driest time to visit Costa Rica when rainfall is around 0.0 in.

Temperature in Costa Rica by month

Plan your trip to Costa Rica by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Costa Rica, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 64.4 F).

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 June 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Ontario to Costa Rica. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
JetBlue
7.3
Good
2,925 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $163. Iberia flights start at $183 while deals on Avianca start at $209 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, September is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $398). Flying from Ontario to Costa Rica in March is currently the most expensive (average of $555). 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 4 airlines flying from Ontario to Costa Rica

Discover the top 4 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$326Average$493FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$349Average$646FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$403Average$650FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$616Average$698FlexibilityNo cancel feeOn-time63%

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