Find Deals on Flights from Ontario to Costa Rica

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Book cheap flights from Ontario to Costa Rica

(Round-trip)
Depart: Sat May 27 2017 Return: Sun Jun 4 2017 Trip spans 9 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
5:50a
33h 07m
2 stops
SJO
2:08a
ONT
8:13p
18h 05m
2 stops
Depart: Thu May 4 2017 Return: Sun May 14 2017 Trip spans 11 days
Volaris
Volaris
ONT
9:16p
SJO
5:49a
8h 33m
1 stop
SJO
8:04a
ONT
8:36p
12h 32m
1 stop
Depart: Tue Apr 25 2017 Return: Mon May 1 2017 Trip spans 7 days
American Airlines
American Airlines
ONT
3:35p
LIR
8:42a
17h 07m
2 stops
LIR
10:50a
ONT
8:18p
9h 28m
1 stop
Depart: Sun May 21 2017 Return: Wed May 31 2017 Trip spans 11 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
6:17p
21h 34m
2 stops
SJO
7:50a
ONT
8:13p
36h 23m
2 stops
Depart: Fri Apr 28 2017 Return: Mon May 1 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
1:30p
SJO
10:10a
20h 40m
2 stops
SJO
12:10p
ONT
1:27p
25h 17m
2 stops
Depart: Mon May 29 2017 Return: Thu Jun 1 2017 Trip spans 4 days
United
United
ONT
1:35a
LIR
6:25a
28h 50m
2 stops
LIR
8:25a
ONT
5:34p
33h 09m
2 stops
Depart: Sun May 28 2017 Return: Fri Jun 9 2017 Trip spans 13 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
6:17p
21h 34m
2 stops
SJO
2:08a
ONT
8:13p
18h 05m
2 stops
Depart: Tue May 16 2017 Return: Wed May 24 2017 Trip spans 9 days
Volaris
Volaris
ONT
9:16p
SJO
5:49a
8h 33m
1 stop
SJO
8:04a
ONT
8:36p
12h 32m
1 stop
Depart: Thu Aug 24 2017 Return: Sat Sep 2 2017 Trip spans 10 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
5:50a
33h 07m
2 stops
SJO
7:50a
ONT
8:13p
36h 23m
2 stops
Depart: Thu Jun 1 2017 Return: Fri Jun 2 2017 Trip spans 2 days
Volaris
Volaris
ONT
9:16p
SJO
5:49a
8h 33m
1 stop
SJO
8:04a
ONT
8:36p
12h 32m
1 stop
Depart: Sat Aug 12 2017 Return: Sat Sep 2 2017 Trip spans 22 days
Aeromexico
Aeromexico
ONT
8:37p
SJO
5:50a
33h 13m
2 stops
SJO
7:50a
ONT
8:13p
36h 23m
2 stops
Depart: Tue Jun 6 2017 Return: Wed Jun 14 2017 Trip spans 9 days
Volaris
Volaris
ONT
9:16p
SJO
5:49a
8h 33m
1 stop
SJO
8:04a
ONT
8:36p
12h 32m
1 stop
Depart: Sun Aug 20 2017 Return: Fri Aug 25 2017 Trip spans 6 days
Volaris
Volaris
ONT
9:16p
SJO
5:49a
8h 33m
1 stop
SJO
8:04a
ONT
8:36p
12h 32m
1 stop
Depart: Sun Apr 30 2017 Return: Thu May 4 2017 Trip spans 5 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
5:50a
33h 07m
2 stops
SJO
7:50a
ONT
8:13p
12h 23m
2 stops
Depart: Fri Apr 21 2017 Return: Mon May 1 2017 Trip spans 11 days
American Airlines
American Airlines
ONT
9:15p
LIR
8:55a
11h 40m
1 stop
LIR
10:50a
ONT
8:18p
9h 28m
1 stop
Depart: Sat May 20 2017 Return: Wed May 24 2017 Trip spans 5 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
6:17p
21h 34m
2 stops
SJO
7:50a
ONT
8:13p
36h 23m
2 stops
Depart: Fri Aug 25 2017 Return: Thu Aug 31 2017 Trip spans 7 days
American Airlines
American Airlines
ONT
8:59p
LIR
8:53a
11h 54m
2 stops
LIR
10:22a
ONT
6:00a
19h 38m
2 stops
Depart: Fri Jun 2 2017 Return: Thu Jun 8 2017 Trip spans 7 days
Aeromexico
Aeromexico
ONT
8:43p
SJO
6:17p
21h 34m
2 stops
SJO
2:08a
ONT
8:13p
18h 05m
2 stops
Depart: Sun Aug 6 2017 Return: Wed Aug 16 2017 Trip spans 11 days
Volaris
Volaris
ONT
9:16p
SJO
5:49a
8h 33m
1 stop
SJO
8:04a
ONT
8:36p
12h 32m
1 stop
Depart: Fri May 19 2017 Return: Mon May 22 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
1:30p
SJO
10:10a
20h 40m
2 stops
SJO
12:10p
ONT
1:30p
25h 20m
2 stops
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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Airports
Origin

Ontario
$322
Destination

Liberia
$557
San Jose
$322