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Ontario

$307+ Cheap flights from Costa Rica to Ontario (ONT)

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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Jul 8 — Jul 151
Wed 7/8
Wed 7/15
1 adult, Economy
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Cheap flight deals from Costa Rica to Ontario

Cheapest flights from Costa Rica to Ontario
Explore the most affordable flight options available from Costa Rica to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 8, 2026.

This Southwest deal was found by Cheapflights users on 6/7. 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.
Thu 10/812:55 pm
SJO
-
ONT
1 stop9h 15m
Southwest
Tue 10/134:40 pm
ONT
-
SJO
1 stop12h 20m
Southwest
Deal found 6/7$528
This Southwest deal was found by Cheapflights users on 6/4. 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.
Tue 9/11:40 pm
SJO
-
ONT
1 stop9h 25m
Southwest
Tue 9/155:45 am
ONT
-
SJO
2 stops11h 55m
Southwest
Deal found 6/4$553
This United Airlines deal was found by Cheapflights users on 6/3. 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 6/263:27 pm
LIR
-
ONT
2 stops21h 45m
United Airlines
Mon 6/295:45 am
ONT
-
LIR
1 stop7h 40m
United Airlines
Deal found 6/3$565
This United Airlines deal was found by Cheapflights users on 6/3. 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.
Wed 9/231:20 pm
LIR
-
ONT
2 stops23h 52m
United Airlines
Sun 9/276:05 am
ONT
-
LIR
2 stops29h 05m
United Airlines
Deal found 6/3$579
This United Airlines deal was found by Cheapflights users on 6/3. 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.
Wed 6/241:20 pm
LIR
-
ONT
1 stop9h 35m
United Airlines
Fri 6/265:00 am
ONT
-
LIR
1 stop9h 19m
United Airlines
Deal found 6/3$586
This BusinessClass deal was found by Cheapflights users on 6/3. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/241:20 pm
LIR
-
ONT
1 stop9h 38m
Multiple Airlines
Tue 9/291:18 pm
ONT
-
LIR
2 stops21h 52m
Multiple Airlines
Deal found 6/3$595
This United Airlines deal was found by Cheapflights users on 6/3. 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.
Wed 9/231:20 pm
LIR
-
ONT
2 stops23h 52m
United Airlines
Sat 10/35:00 am
ONT
-
LIR
1 stop9h 19m
United Airlines
Deal found 6/3$600
This United Airlines deal was found by Cheapflights users on 6/7. 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.
Mon 6/2911:49 am
LIR
-
ONT
2 stops25h 23m
United Airlines
Sat 7/45:45 am
ONT
-
LIR
1 stop27h 05m
United Airlines
Deal found 6/7$607
This Faresmojo deal was found by Cheapflights users on 6/8. 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 Faresmojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/11:25 pm
SJO
-
ONT
1 stop9h 30m
JetBlue
Sun 8/910:00 pm
ONT
-
SJO
1 stop12h 49m
JetBlue
Deal found 6/8$617
This Faresmojo deal was found by Cheapflights users on 6/4. 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 Faresmojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/88:45 am
SJO
-
ONT
1 stop10h 11m
JetBlue
Mon 6/1510:00 pm
ONT
-
SJO
1 stop12h 54m
JetBlue
Deal found 6/4$618
This Southwest deal was found by Cheapflights users on 6/4. 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.
Tue 9/11:40 pm
SJO
-
ONT
1 stop9h 25m
Southwest
Thu 9/106:00 am
ONT
-
SJO
2 stops11h 40m
Southwest
Deal found 6/4$630
This Avianca deal was found by Cheapflights users on 6/7. 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.
Sat 12/129:35 am
SJO
-
ONT
1 stop13h 20m
Avianca
Sat 2/2010:30 pm
ONT
-
SJO
1 stop13h 10m
Avianca
Deal found 6/7$638

Find flight deals from Costa Rica to Ontario

Keep the following information in mind while searching for Costa Rica to Ontario flight deals. Data was last updated June 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$528
(Southwest)

One-way from

$307
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$517
Provider with most accurate pricing for San José Juan Santamaria Intl-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for San José Juan Santamaria Intl-Los Angeles flights.
Search Deals
From Costa Rica to Ontario
Search Deals
One-way flight from Costa Rica to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($48 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Costa Rica to Ontario 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 8, 2026.
Use the filters below to find and compare flights from Costa Rica to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Fri 10/30

11:50 am-8:20 pm

1 stop9h 30m

Ontario

Mon 11/9

6:02 am-6:37 pm

1 stop10h 35m

$565

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Wed 8/26

1:20 pm-6:11 pm

2 stops29h 51m

Ontario

Mon 8/31

7:13 pm-12:10 pm

2 stops15h 57m

$565

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Wed 6/24

3:27 pm-12:12 pm

2 stops21h 45m

Ontario

Mon 6/29

5:45 am-2:25 pm

1 stop7h 40m

$565

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Wed 9/23

1:20 pm-12:12 pm

2 stops23h 52m

Ontario

Sun 9/27

6:05 am-12:10 pm

2 stops29h 05m

$579

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Thu 9/17

1:20 pm-9:59 pm

1 stop9h 39m

Ontario

Thu 9/24

6:00 am-12:10 pm

1 stop29h 10m

$586

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Thu 7/2

1:20 pm-12:47 pm

2 stops24h 27m

Ontario

Sat 7/11

1:50 pm-12:10 pm

2 stops21h 20m

$586
Quickest round-trip

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Wed 7/1

1:20 pm-9:55 pm

1 stop9h 35m

Ontario

Thu 7/9

5:00 am-3:19 pm

1 stop9h 19m

$586

LiberiaOntario

LIR - ONT

LIRONT

Liberia

Thu 7/2

1:20 pm-12:47 pm

2 stops24h 27m

Ontario

Thu 7/9

5:00 am-3:19 pm

1 stop9h 19m

$586

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Mon 6/15

12:30 am-10:37 pm

2 stops23h 07m

Ontario

Tue 6/23

1:50 pm-7:15 am

1 stop16h 25m

$640

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 6/12

7:55 am-10:37 pm

2 stops15h 42m

Ontario

Sun 6/14

1:50 pm-10:11 am

2 stops19h 21m

$640

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/7

Showing 1-10 of 39 resultsSorted by cheapest first
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Best time to book a flight from Costa Rica to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Costa Rica 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 Costa Rica to Ontario

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

Currently, August is the cheapest month in which you can book a flight from Costa Rica to Ontario (average of $264). Flying from Costa Rica to Ontario in July is currently the most expensive (average of $324). 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.

How far ahead should I book a flight from Costa Rica to Ontario?

To ensure you get the cheapest price possible for a flight from Costa Rica to Ontario, you should look to book at least 9 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated June 8, 2026.
Read through reviews of airlines operating flights from Costa Rica to Ontario, such as United Airlines and Avianca. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,785 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,785 reviews
United Airlines
7.4
Good
9,785 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Avianca
6.5
Okay
2,531 reviews
United Airlines
7.4
Good
9,785 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from Costa Rica to Ontario. 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 into for flights to Ontario from Costa Rica?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from Costa Rica.

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

    Departing from Costa Rica to Ontario will take you 9h 30m. Costa Rica and Ontario are separated by a distance of 2590 mi.

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

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $161. However, be on the lookout for offers from American Airlines and Avianca, as they are both options that can get you from Costa Rica to Ontario for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Costa Rica to Ontario 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 Costa Rica to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Costa Rica to Ontario (average of $264). Flying from Costa Rica to Ontario in July is currently the most expensive (average of $324). 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 2 airlines flying from Costa Rica to Ontario

Discover the top 2 airlines that operate flights from Costa Rica to Ontario. 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 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$267Average$388FlexibilityNo cancel feeOn-time69%
AviancaCheapest$361Average$430FlexibilityNo cancel feeOn-time71%

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