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$167+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Thg. 4 7 — Thg. 4 141
Th. 3 4/7
Th. 3 4/14
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 Tháng Ba 8, 2026.

This Super.com deal was found by Cheapflights users on 3/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 3 5/511:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Th. 3 5/123:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 3/3$391
This Avianca deal was found by Cheapflights users on 3/4. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 7 5/1611:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Th. 5 5/219:40 am
SJO
-
ONT
1 stop13h 05m
Avianca
Deal found 3/4$405
This FlightHub deal was found by Cheapflights users on 3/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 7 5/211:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Th. 5 5/73:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 3/3$417
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Th. 2 3/96:15 am
ONT
-
SJO
2 stops14h 17m
United Airlines
Th. 4 3/118:40 am
SJO
-
ONT
1 stop10h 01m
United Airlines
Deal found 3/5$423
This Avianca deal was found by Cheapflights users on 3/6. 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.
Th. 7 5/911:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Th. 7 5/163:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 3/6$427
This Gotogate deal was found by Cheapflights users on 3/5. 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.
Th. 3 5/1211:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Th. 7 5/169:40 am
SJO
-
ONT
1 stop13h 05m
Avianca
Deal found 3/5$429
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Th. 4 5/136:59 pm
ONT
-
SJO
1 stop11h 16m
United Airlines
CN 5/2411:13 am
SJO
-
ONT
1 stop11h 42m
United Airlines
Deal found 3/5$434
This American Airlines deal was found by Cheapflights users on 3/3. 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.
Th. 2 9/288:02 pm
ONT
-
SJO
2 stops20h 48m
American Airlines
Th. 2 10/192:45 pm
SJO
-
ONT
2 stops19h 16m
American Airlines
Deal found 3/3$439
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 3 4/289:45 pm
ONT
-
LIR
2 stops14h 30m
Southwest
Th. 4 5/62:10 pm
LIR
-
ONT
1 stop9h 15m
Southwest
Deal found 3/4$446
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 4 4/299:45 pm
ONT
-
LIR
2 stops14h 30m
Southwest
Th. 4 5/62:10 pm
LIR
-
ONT
1 stop9h 15m
Southwest
Deal found 3/4$500
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 2 5/119:55 pm
ONT
-
LIR
2 stops14h 20m
Southwest
Th. 4 5/202:10 pm
LIR
-
ONT
1 stop9h 15m
Southwest
Deal found 3/4$515
This Expedia deal was found by Cheapflights users on 3/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Th. 3 4/2812:48 pm
ONT
-
LIR
2 stops16h 32m
Alaska Airlines
Th. 4 5/611:20 am
LIR
-
ONT
3 stops23h 25m
Alaska Airlines
Deal found 3/4$542

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 Tháng Ba 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$391
(Super.com)

One-way from

$167
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$545
Provider with most accurate pricing for Ontario-San José Juan Santamaria Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-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. 8% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 Tháng Ba 8, 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

Th. 2 5/11

6:59 pm-7:15 am

1 stop11h 16m

San José Juan Santamaria Intl

CN 5/17

8:45 am-5:52 pm

1 stop10h 07m

$544

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 6 9/4

1:44 pm-7:15 am

1 stop16h 31m

San José Juan Santamaria Intl

Th. 5 9/10

1:25 pm-9:59 pm

1 stop9h 34m

$544

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 3 5/12

6:59 pm-7:37 pm

2 stops23h 38m

San José Juan Santamaria Intl

Th. 7 5/16

7:55 am-10:59 pm

2 stops16h 04m

$549

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 4 6/17

1:50 pm-10:11 am

2 stops19h 21m

San José Juan Santamaria Intl

CN 6/21

12:30 am-9:55 pm

1 stop22h 25m

$561

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 4 6/17

5:45 am-10:11 am

1 stop27h 26m

San José Juan Santamaria Intl

Th. 7 6/20

12:30 am-9:55 pm

1 stop22h 25m

$569

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 7 4/11

1:34 pm-10:11 am

2 stops19h 37m

San José Juan Santamaria Intl

Th. 2 4/20

11:13 am-12:38 pm

2 stops26h 25m

$587

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 3 5/5

6:59 pm-12:21 pm

2 stops16h 22m

San José Juan Santamaria Intl

Th. 6 5/8

8:45 am-12:22 pm

1 stop28h 37m

$594

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 5 6/11

5:45 am-10:39 pm

1 stop15h 54m

San José Juan Santamaria Intl

CN 6/21

12:30 am-9:55 pm

1 stop22h 25m

$595

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 4 6/3

5:45 am-10:39 pm

1 stop15h 54m

San José Juan Santamaria Intl

Th. 4 8/12

1:25 pm-12:12 pm

2 stops23h 47m

$622

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Th. 7 6/20

5:45 am-7:37 pm

1 stop12h 52m

San José Juan Santamaria Intl

Th. 3 7/14

12:30 am-12:12 pm

2 stops12h 42m

$625

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Showing 1-10 of 39 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, May is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $190). Flying from Ontario to Costa Rica in July is currently the most expensive (average of $442). 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 Tháng Ba 8, 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
9,407 reviews

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Food

6.6

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
9,407 reviews
United Airlines
7.4
Good
9,407 reviews

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Food

6.6

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
11,401 reviews
United Airlines
7.4
Good
9,407 reviews

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Food

6.6

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
2,494 reviews
United Airlines
7.4
Good
9,407 reviews

Overall

7.4

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

Food

6.6

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 11h 16m. 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, May is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $190). Flying from Ontario to Costa Rica in July is currently the most expensive (average of $442). 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 Tháng Ba 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$215Average$528FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$349Average$466FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$366Average$574FlexibilityNo cancel feeOn-time71%

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