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Cheap flights from Ontario to Costa Rica from $194

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 8/25. 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.
Frontier Logo
10:50 am - 8:20 am
ONT
-
SJO
44h 30m
2 stops
Frontier Logo
9:35 am - 7:48 pm
SJO
-
ONT
35h 13m
2 stops
$451Frontier
Wed, Aug 19 - Fri, Aug 28
Southwest Logo
8:35 pm - 6:40 pm
ONT
-
SJO
21h 05m
2 stops
Southwest Logo
9:00 am - 9:45 pm
SJO
-
ONT
13h 45m
2 stops
$488Southwest
Sun, Sep 13 - Thu, Sep 24
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$509Avianca
Sat, Jun 6 - Thu, Jun 11
American Airlines Logo
2:22 pm - 11:05 am
ONT
-
SJO
19h 43m
2 stops
American Airlines Logo
12:57 pm - 11:06 pm
SJO
-
ONT
11h 09m
1 stop
$519American Airlines
Fri, Sep 18 - Fri, Sep 25
American Airlines Logo
11:59 pm - 7:52 pm
ONT
-
SJO
18h 53m
2 stops
American Airlines Logo
1:29 pm - 9:34 am
SJO
-
ONT
21h 05m
2 stops
$524American Airlines
Sun, Aug 16 - Sun, Aug 23
United Airlines Logo
6:39 pm - 7:15 am
ONT
-
SJO
11h 36m
1 stop
United Airlines Logo
12:30 am - 12:12 pm
SJO
-
ONT
12h 42m
2 stops
$529United Airlines
Mon, Jun 1 - Fri, Jun 5
Avianca Logo
11:35 pm - 11:30 am
ONT
-
SJO
10h 55m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$533Avianca
Thu, Jun 4 - Thu, Jun 11
United Airlines Logo
1:44 pm - 12:10 pm
ONT
-
LIR
21h 26m
2 stops
United Airlines Logo
1:20 pm - 12:12 pm
LIR
-
ONT
23h 52m
2 stops
$615United Airlines
Thu, Aug 27 - Tue, Sep 1
JetBlue Logo
10:41 pm - 12:40 pm
ONT
-
LIR
12h 59m
1 stop
JetBlue Logo
2:00 pm - 10:01 pm
LIR
-
ONT
33h 01m
1 stop
$669JetBlue
Sat, Jun 6 - Fri, Jun 12
JetBlue Logo
10:41 pm - 12:40 pm
ONT
-
LIR
12h 59m
1 stop
JetBlue Logo
2:00 pm - 10:01 pm
LIR
-
ONT
33h 01m
1 stop
$674JetBlue
Mon, Jun 8 - Fri, Jun 12

Frontier flights from Ontario to Costa Rica

Our best Frontier deals on Ontario to Costa Rica flight tickets
Frontier
Aug 19
ONT10:50 amOntario
44h 30m
2 stops
SJO8:20 amSan José Juan Santamaria Intl
Aug 28
SJO9:35 amSan José Juan Santamaria Intl
35h 13m
2 stops
ONT7:48 pmOntario
$451
Frontier
Aug 19
ONT10:50 amOntario
44h 30m
2 stops
SJO8:20 amSan José Juan Santamaria Intl
Aug 28
SJO9:35 amSan José Juan Santamaria Intl
30h 34m
2 stops
ONT3:09 pmOntario
$499
Frontier
Aug 15
ONT11:43 amOntario
19h 37m
2 stops
SJO8:20 amSan José Juan Santamaria Intl
Aug 22
SJO9:35 amSan José Juan Santamaria Intl
32h 13m
2 stops
ONT4:48 pmOntario
$560

Avianca flights from Ontario to Costa Rica

Our best Avianca deals on Ontario to Costa Rica flight tickets
Avianca
Jun 6
ONT11:35 pmOntario
8h 10m
1 stop
SJO8:45 amSan José Juan Santamaria Intl
Jun 11
SJO3:10 pmSan José Juan Santamaria Intl
7h 35m
1 stop
ONT9:45 pmOntario
$509
Avianca
Jun 4
ONT11:35 pmOntario
10h 55m
1 stop
SJO11:30 amSan José Juan Santamaria Intl
Jun 11
SJO3:10 pmSan José Juan Santamaria Intl
7h 35m
1 stop
ONT9:45 pmOntario
$533
Avianca
May 16
ONT11:35 pmOntario
8h 10m
1 stop
SJO8:45 amSan José Juan Santamaria Intl
May 23
SJO3:10 pmSan José Juan Santamaria Intl
7h 35m
1 stop
ONT9:45 pmOntario
$539

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 May 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

Wed 8/19

10:50 am-8:20 am

2 stops44h 30m

San José Juan Santamaria Intl

Fri 8/28

9:35 am-7:48 pm

2 stops35h 13m

$451

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 9/13

8:35 pm-6:40 pm

2 stops21h 05m

San José Juan Santamaria Intl

Thu 9/24

9:00 am-9:45 pm

2 stops13h 45m

$488
Quickest round-trip

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 6/6

11:35 pm-8:45 am

1 stop8h 10m

San José Juan Santamaria Intl

Thu 6/11

3:10 pm-9:45 pm

1 stop7h 35m

$509

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 9/18

2:22 pm-11:05 am

2 stops19h 43m

San José Juan Santamaria Intl

Fri 9/25

12:57 pm-11:06 pm

1 stop11h 09m

$519

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 8/16

11:59 pm-7:52 pm

2 stops18h 53m

San José Juan Santamaria Intl

Sun 8/23

1:29 pm-9:34 am

2 stops21h 05m

$524

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/1

6:39 pm-7:15 am

1 stop11h 36m

San José Juan Santamaria Intl

Fri 6/5

12:30 am-12:12 pm

2 stops12h 42m

$529

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 6/4

11:35 pm-11:30 am

1 stop10h 55m

San José Juan Santamaria Intl

Thu 6/11

3:10 pm-9:45 pm

1 stop7h 35m

$533

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Thu 8/27

1:44 pm-12:10 pm

2 stops21h 26m

Liberia

Tue 9/1

1:20 pm-12:12 pm

2 stops23h 52m

$615

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sat 6/6

10:41 pm-12:40 pm

1 stop12h 59m

Liberia

Fri 6/12

2:00 pm-10:01 pm

1 stop33h 01m

$669

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Mon 6/8

10:41 pm-12:40 pm

1 stop12h 59m

Liberia

Fri 6/12

2:00 pm-10:01 pm

1 stop33h 01m

$674

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 February. Flight prices, which tend to average around $119, are often lower during this time because this is during the off-season. If you’re not able to fly to Costa Rica in February, then January is your next best option. Flight prices from Ontario to Costa Rica during January average around $173.

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

You could potentially save up to 26% 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

7h 25m

Direct flights

None
The fastest flight from Ontario to Costa Rica takes 7h 25m
There are no direct flights from Ontario to Costa Rica. There are no popular flight routes from Ontario to Costa Rica.
Search flight deals

Frequently asked questions about flying from Ontario to Costa Rica

  • 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 $190Free CancellationRating
7.4
9,694 reviews
Search United Airlines flights
American AirlinesPriceFrom $356Free CancellationRating
7.1
11,667 reviews
Search American Airlines flights
AviancaPriceFrom $404Free CancellationRating
6.5
2,523 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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