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Cheap flights from Ontario to Costa Rica from $156

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 3/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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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.
American Airlines Logo
6:00 am - 11:43 pm
ONT
-
SJO
15h 43m1 stop
American Airlines Logo
2:54 pm - 10:48 pm
SJO
-
ONT
9h 54m1 stop
$304American Airlines
mié., ene. 21 - mié., feb. 4
American Airlines Logo
7:16 am - 11:43 pm
ONT
-
SJO
14h 27m1 stop
American Airlines Logo
2:13 pm - 10:08 am
SJO
-
ONT
21h 55m2 stops
$308American Airlines
mié., ene. 21 - mié., feb. 4
American Airlines Logo
11:59 pm - 12:43 pm
ONT
-
SJO
10h 44m2 stops
American Airlines Logo
2:54 pm - 10:48 pm
SJO
-
ONT
9h 54m1 stop
$330American Airlines
lun., feb. 2 - mar., feb. 10
United Airlines Logo
6:00 am - 8:39 pm
ONT
-
SJO
12h 39m1 stop
United Airlines Logo
9:40 am - 10:57 pm
SJO
-
ONT
15h 17m1 stop
$334United Airlines
jue., feb. 19 - jue., feb. 26
American Airlines Logo
11:59 pm - 10:30 pm
ONT
-
SJO
20h 31m2 stops
American Airlines Logo
2:54 pm - 6:45 pm
SJO
-
ONT
29h 51m1 stop
$335American Airlines
lun., ene. 12 - jue., ene. 22
American Airlines Logo
3:09 pm - 3:01 pm
ONT
-
SJO
21h 52m1 stop
American Airlines Logo
2:54 pm - 10:08 am
SJO
-
ONT
21h 14m1 stop
$336American Airlines
lun., ene. 26 - vie., ene. 30
United Airlines Logo
6:00 am - 6:16 pm
ONT
-
SJO
10h 16m1 stop
United Airlines Logo
9:40 am - 5:43 pm
SJO
-
ONT
10h 03m1 stop
$362United Airlines
lun., ene. 19 - lun., ene. 26
United Airlines Logo
6:00 am - 6:37 pm
ONT
-
LIR
10h 37m1 stop
United Airlines Logo
2:20 pm - 11:18 am
LIR
-
ONT
22h 58m2 stops
$415United Airlines
lun., ene. 19 - jue., ene. 22
Alaska Airlines Logo
7:56 pm - 6:01 pm
ONT
-
LIR
20h 05m3 stops
Alaska Airlines Logo
11:20 am - 10:59 am
LIR
-
ONT
25h 39m2 stops
$476Alaska Airlines
lun., ene. 19 - jue., ene. 22
Alaska Airlines Logo
6:08 pm - 5:58 pm
ONT
-
LIR
21h 50m2 stops
Alaska Airlines Logo
7:08 pm - 7:14 pm
LIR
-
ONT
26h 06m3 stops
$499Alaska Airlines
lun., feb. 23 - lun., mar. 2

American Airlines flights from Ontario to Costa Rica

Our best American Airlines deals on Ontario to Costa Rica flight tickets
American Airlines
Jan 21
ONT6:00 amOntario
15h 43m
1 stop
SJO11:43 pmSan José Juan Santamaria Intl
Feb 4
SJO2:54 pmSan José Juan Santamaria Intl
9h 54m
1 stop
ONT10:48 pmOntario
$304
Find similar
American Airlines
Jan 21
ONT7:16 amOntario
14h 27m
1 stop
SJO11:43 pmSan José Juan Santamaria Intl
Feb 4
SJO2:13 pmSan José Juan Santamaria Intl
21h 55m
2 stops
ONT10:08 amOntario
$308
Find similar
American Airlines
Feb 2
ONT11:59 pmOntario
10h 44m
2 stops
SJO12:43 pmSan José Juan Santamaria Intl
Feb 10
SJO2:54 pmSan José Juan Santamaria Intl
9h 54m
1 stop
ONT10:48 pmOntario
$330
Find similar

United Airlines flights from Ontario to Costa Rica

Our best United Airlines deals on Ontario to Costa Rica flight tickets
United Airlines
Feb 19
ONT6:00 amOntario
12h 39m
1 stop
SJO8:39 pmSan José Juan Santamaria Intl
Feb 26
SJO9:40 amSan José Juan Santamaria Intl
15h 17m
1 stop
ONT10:57 pmOntario
$334
Find similar
United Airlines
Jan 19
ONT6:00 amOntario
10h 16m
1 stop
SJO6:16 pmSan José Juan Santamaria Intl
Jan 26
SJO9:40 amSan José Juan Santamaria Intl
10h 03m
1 stop
ONT5:43 pmOntario
$362
Find similar
United Airlines
Feb 5
ONT6:39 pmOntario
11h 53m
1 stop
SJO8:32 amSan José Juan Santamaria Intl
Feb 8
SJO8:45 amSan José Juan Santamaria Intl
15h 13m
1 stop
ONT9:58 pmOntario
$364
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 diciembre 4, 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

mié. 1/21

6:00 am-11:43 pm

1 stop15h 43m

San José Juan Santamaria Intl

mié. 2/4

2:54 pm-10:48 pm

1 stop9h 54m

$304

OntarioSan José

ONT - SJO

ONTSJO

Ontario

mié. 1/21

7:16 am-11:43 pm

1 stop14h 27m

San José Juan Santamaria Intl

mié. 2/4

2:13 pm-10:08 am

2 stops21h 55m

$308

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 2/2

11:59 pm-12:43 pm

2 stops10h 44m

San José Juan Santamaria Intl

mar. 2/10

2:54 pm-10:48 pm

1 stop9h 54m

$330

OntarioSan José

ONT - SJO

ONTSJO

Ontario

jue. 2/19

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

jue. 2/26

9:40 am-10:57 pm

1 stop15h 17m

$334

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 1/12

11:59 pm-10:30 pm

2 stops20h 31m

San José Juan Santamaria Intl

jue. 1/22

2:54 pm-6:45 pm

1 stop29h 51m

$335

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 1/26

3:09 pm-3:01 pm

1 stop21h 52m

San José Juan Santamaria Intl

vie. 1/30

2:54 pm-10:08 am

1 stop21h 14m

$336

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 1/19

6:00 am-6:16 pm

1 stop10h 16m

San José Juan Santamaria Intl

lun. 1/26

9:40 am-5:43 pm

1 stop10h 03m

$362

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

lun. 1/19

6:00 am-6:37 pm

1 stop10h 37m

Liberia

jue. 1/22

2:20 pm-11:18 am

2 stops22h 58m

$415

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

lun. 1/19

7:56 pm-6:01 pm

3 stops20h 05m

Liberia

jue. 1/22

11:20 am-10:59 am

2 stops25h 39m

$476

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

lun. 2/23

6:08 pm-5:58 pm

2 stops21h 50m

Liberia

lun. 3/2

7:08 pm-7:14 pm

3 stops26h 06m

$499

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 29% 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

Fastest flight time

8h 37m

Direct flights

None
The fastest flight from Ontario to Costa Rica takes 8h 37m
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
9,066 reviews
Search United Airlines flights
American AirlinesPriceFrom $366Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
AviancaPriceFrom $413Free CancellationRating
6.6
2,479 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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