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Cheap flights from Ontario to Costa Rica from $160

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Costa Rica departing on 12/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Ontario to Costa Rica

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
5:05 am - 7:39 pmONT-SJO
13h 34m2 stops
United Airlines Logo
9:40 am - 10:51 pmSJO-ONT
15h 11m1 stop
$372United Airlines
Find Deal
Wed, Oct 29 - Sun, Nov 2
Avianca Logo
10:30 pm - 11:25 amONT-SJO
10h 55m1 stop
Avianca Logo
9:35 am - 8:55 pmSJO-ONT
13h 20m1 stop
$375Avianca
Find Deal
Sat, Nov 8 - Sat, Nov 15
American Airlines Logo
7:30 pm - 12:34 pmONT-SJO
15h 04m2 stops
American Airlines Logo
8:00 am - 10:49 pmSJO-ONT
16h 49m2 stops
$376American Airlines
Find Deal
Thu, Jan 29 - Mon, Feb 2
Avianca Logo
10:30 pm - 11:25 amONT-SJO
10h 55m1 stop
Avianca Logo
9:35 am - 8:55 pmSJO-ONT
13h 20m1 stop
$379Avianca
Find Deal
Sat, Jan 17 - Sat, Jan 24
Avianca Logo
10:30 pm - 11:25 amONT-SJO
10h 55m1 stop
Avianca Logo
5:00 am - 8:55 pmSJO-ONT
17h 55m1 stop
$385Avianca
Find Deal
Tue, Nov 11 - Tue, Nov 18
American Airlines Logo
7:00 am - 11:12 pmONT-SJO
14h 12m1 stop
American Airlines Logo
2:56 pm - 8:53 amSJO-ONT
19h 57m2 stops
$416American Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Southwest Logo
5:25 am - 8:30 pmONT-SJO
13h 05m1 stop
Southwest Logo
9:00 am - 10:05 pmSJO-ONT
15h 05m2 stops
$458Southwest
Find Deal
Tue, Nov 4 - Wed, Nov 5
United Airlines Logo
6:38 pm - 8:32 amONT-SJO
11h 54m1 stop
United Airlines Logo
9:40 am - 10:51 pmSJO-ONT
15h 11m1 stop
$482United Airlines
Find Deal
Tue, Nov 4 - Tue, Nov 11
Delta Logo
6:00 am - 1:30 pmONT-LIR
29h 30m2 stops
Delta Logo
3:55 pm - 10:52 pmLIR-ONT
32h 57m2 stops
$535Delta
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Tue, Dec 30 - Thu, Jan 15
Delta Logo
6:00 am - 12:50 pmONT-LIR
28h 50m2 stops
Delta Logo
2:15 pm - 12:34 pmLIR-ONT
24h 19m2 stops
$555Delta
Find Deal
Thu, Jan 1 - Wed, Jan 14

Avianca flights from Ontario to Costa Rica

Our best Avianca deals on Ontario to Costa Rica flight tickets
Avianca
Oct 23
ONT11:25 pmOntario
10h 50m
1 stop
SJO11:15 amSan José Juan Santamaria Intl
Oct 30
SJO3:05 pmSan José Juan Santamaria Intl
7h 50m
1 stop
ONT9:55 pmOntario
$368
Find similar
Avianca
Nov 8
ONT10:30 pmOntario
10h 55m
1 stop
SJO11:25 amSan José Juan Santamaria Intl
Nov 15
SJO9:35 amSan José Juan Santamaria Intl
13h 20m
1 stop
ONT8:55 pmOntario
$375
Find similar
Avianca
Jan 17
ONT10:30 pmOntario
10h 55m
1 stop
SJO11:25 amSan José Juan Santamaria Intl
Jan 24
SJO9:35 amSan José Juan Santamaria Intl
13h 20m
1 stop
ONT8:55 pmOntario
$379
Find similar

American Airlines flights from Ontario to Costa Rica

Our best American Airlines deals on Ontario to Costa Rica flight tickets
American Airlines
Oct 17
ONT6:10 amOntario
11h 06m
1 stop
SJO6:16 pmSan José Juan Santamaria Intl
Oct 24
SJO6:00 amSan José Juan Santamaria Intl
11h 00m
2 stops
ONT4:00 pmOntario
$366
Find similar
American Airlines
Jan 29
ONT7:30 pmOntario
15h 04m
2 stops
SJO12:34 pmSan José Juan Santamaria Intl
Feb 2
SJO8:00 amSan José Juan Santamaria Intl
16h 49m
2 stops
ONT10:49 pmOntario
$376
Find similar
American Airlines
Oct 17
ONT6:10 amOntario
11h 06m
1 stop
SJO6:16 pmSan José Juan Santamaria Intl
Oct 24
SJO6:00 amSan José Juan Santamaria Intl
11h 28m
1 stop
ONT4:28 pmOntario
$405
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated October 16, 2025.
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

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 10/29

5:05 am-7:39 pm

2 stops13h 34m

San José Juan Santamaria Intl

Sun 11/2

9:40 am-10:51 pm

1 stop15h 11m

$372

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 11/8

10:30 pm-11:25 am

1 stop10h 55m

San José Juan Santamaria Intl

Sat 11/15

9:35 am-8:55 pm

1 stop13h 20m

$375

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 1/29

7:30 pm-12:34 pm

2 stops15h 04m

San José Juan Santamaria Intl

Mon 2/2

8:00 am-10:49 pm

2 stops16h 49m

$376

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 1/17

10:30 pm-11:25 am

1 stop10h 55m

San José Juan Santamaria Intl

Sat 1/24

9:35 am-8:55 pm

1 stop13h 20m

$379

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 11/11

10:30 pm-11:25 am

1 stop10h 55m

San José Juan Santamaria Intl

Tue 11/18

5:00 am-8:55 pm

1 stop17h 55m

$385

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 11/26

7:00 am-11:12 pm

1 stop14h 12m

San José Juan Santamaria Intl

Wed 12/3

2:56 pm-8:53 am

2 stops19h 57m

$416

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 11/4

5:25 am-8:30 pm

1 stop13h 05m

San José Juan Santamaria Intl

Wed 11/5

9:00 am-10:05 pm

2 stops15h 05m

$458

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 11/4

6:38 pm-8:32 am

1 stop11h 54m

San José Juan Santamaria Intl

Tue 11/11

9:40 am-10:51 pm

1 stop15h 11m

$482

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Tue 12/30

6:00 am-1:30 pm

2 stops29h 30m

Liberia

Thu 1/15

3:55 pm-10:52 pm

2 stops32h 57m

$535

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Thu 1/1

6:00 am-12:50 pm

2 stops28h 50m

Liberia

Wed 1/14

2:15 pm-12:34 pm

2 stops24h 19m

$555

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Costa Rica from

How to get the cheapest flight ticket from Ontario to Costa Rica

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Costa Rica?

The cheapest month to fly to Costa Rica from Ontario is in October. Flight prices, which tend to average around $371, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in October, then September is your next best option. Flight prices from Ontario to Costa Rica during September average around $390.

What is the cheapest day to depart on your flight to Costa Rica?

According to our data, Monday is the cheapest day to fly to Costa Rica from Ontario. The lowest ticket price found for a Monday departure recently was $462. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $653. These prices are subject to change though, so be sure to set up a Price Alert for flights to Costa Rica.

What is the cheapest time of day to depart on your flight to Costa Rica?

In the evening is the cheapest time of day to fly from Ontario to Costa Rica when you can find flight prices for as low as $473. Flying to Costa Rica in the evening is an ideal time because this is during off-peak travel hours. Flights to Costa Rica are more costly in the morning, with an average ticket price of $669. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Ontario to Costa Rica flights?

You could potentially save up to 6% on your flight if you consider stops on a Ontario to Costa Rica flight.

Cheap Ontario to Costa Rica flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Costa Rica

Direct flights

None
There are no direct flights from Ontario to Costa Rica. There are no popular flight routes from Ontario to Costa Rica.
Search flight deals

  • When did momondo last update prices for flights from Ontario Airport to Costa Rica?

    Prices for flights from Ontario Airport to Costa Rica were last updated today.

  • How many operators does momondo search for flights from Ontario Airport to Costa Rica?

  • How old do you have to be to fly from Ontario Airport to Costa Rica?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Costa Rica.

  • What documentation or ID do you need to fly to Costa Rica?

    The travel and health documents required for your trip to Costa Rica can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Costa Rica. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to Costa Rica

Compare and see reviews for airlines that fly from Ontario to Costa Rica with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $351Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
American AirlinesPriceFrom $366Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
AviancaPriceFrom $413Free CancellationRating
6.6
2,452 reviews
Search Avianca flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Costa Rica?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Costa Rica. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Costa Rica with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to Costa Rica flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to Costa Rica?

momondo provides multiple filters to help you find the best flight to Costa Rica from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Ontario to Costa Rica right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to Costa Rica flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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