Latest deals
Insights
FAQs
Reviews
Price Alerts

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 10/29. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to Costa Rica

Cheap round-trip flights

American Airlines Logo
10:35 pm - 7:42 pmONT-SJO
20h 07m2 stops
American Airlines Logo
7:27 am - 10:33 pmSJO-ONT
16h 06m1 stop
$356American Airlines
Find Deal
Fri, Sep 19 - Wed, Sep 24
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
Avianca Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
$362Avianca
Find Deal
Tue, Sep 23 - Tue, Oct 7
American Airlines Logo
12:47 pm - 5:57 pmONT-SJO
28h 10m1 stop
American Airlines Logo
6:00 am - 9:24 pmSJO-ONT
16h 24m2 stops
$364American Airlines
Find Deal
Tue, Sep 23 - Tue, Sep 30
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
Avianca Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
$368Avianca
Find Deal
Sat, Sep 13 - Tue, Sep 23
Delta Logo
10:00 pm - 12:08 pmONT-SJO
13h 08m1 stop
Delta Logo
1:35 pm - 10:23 pmSJO-ONT
9h 48m1 stop
$430Delta
Find Deal
Fri, Sep 26 - Fri, Oct 3
United Airlines Logo
6:50 pm - 7:15 amONT-SJO
11h 25m1 stop
United Airlines Logo
1:30 pm - 9:25 pmSJO-ONT
8h 55m1 stop
$453United Airlines
Find Deal
Mon, Sep 8 - Wed, Sep 17
United Airlines Logo
6:50 pm - 7:15 amONT-SJO
11h 25m1 stop
United Airlines Logo
8:37 am - 8:33 pmSJO-ONT
12h 56m1 stop
$462United Airlines
Find Deal
Wed, Sep 17 - Mon, Sep 22
Delta Logo
10:00 pm - 12:00 pmONT-LIR
13h 00m1 stop
Delta Logo
1:25 pm - 10:22 pmLIR-ONT
9h 57m1 stop
$536Delta
Find Deal
Sun, Oct 5 - Thu, Oct 9
Alaska Airlines Logo
6:00 am - 6:20 amONT-LIR
23h 20m3 stops
Alaska Airlines Logo
11:20 am - 10:44 amLIR-ONT
24h 24m3 stops
$596Alaska Airlines
Find Deal
Wed, Sep 10 - Wed, Sep 17
Alaska Airlines Logo
6:00 am - 6:20 amONT-LIR
23h 20m3 stops
Alaska Airlines Logo
11:20 am - 10:44 amLIR-ONT
24h 24m2 stops
$610Alaska Airlines
Find Deal
Wed, Sep 10 - Wed, Sep 17

American Airlines flights from Ontario to Costa Rica

Our best American Airlines deals on Ontario to Costa Rica flight tickets
American Airlines
Sep 19
ONT10:35 pmOntario
20h 07m
2 stops
SJO7:42 pmSan José Juan Santamaria Intl
Sep 24
SJO7:27 amSan José Juan Santamaria Intl
16h 06m
1 stop
ONT10:33 pmOntario
$356
Find similar
American Airlines
Sep 23
ONT12:47 pmOntario
28h 10m
1 stop
SJO5:57 pmSan José Juan Santamaria Intl
Sep 30
SJO6:00 amSan José Juan Santamaria Intl
16h 24m
2 stops
ONT9:24 pmOntario
$364
Find similar
American Airlines
Oct 11
ONT11:59 pmOntario
17h 17m
1 stop
SJO6:16 pmSan José Juan Santamaria Intl
Oct 16
SJO6:00 amSan José Juan Santamaria Intl
17h 18m
1 stop
ONT10:18 pmOntario
$376
Find similar

United Airlines flights from Ontario to Costa Rica

Our best United Airlines deals on Ontario to Costa Rica flight tickets
United Airlines
Sep 8
ONT6:50 pmOntario
11h 25m
1 stop
SJO7:15 amSan José Juan Santamaria Intl
Sep 17
SJO1:30 pmSan José Juan Santamaria Intl
8h 55m
1 stop
ONT9:25 pmOntario
$453
Find similar
United Airlines
Sep 17
ONT6:50 pmOntario
11h 25m
1 stop
SJO7:15 amSan José Juan Santamaria Intl
Sep 22
SJO8:37 amSan José Juan Santamaria Intl
12h 56m
1 stop
ONT8:33 pmOntario
$462
Find similar
United Airlines
Sep 12
ONT6:38 pmOntario
16h 48m
2 stops
SJO12:26 pmSan José Juan Santamaria Intl
Sep 15
SJO8:37 amSan José Juan Santamaria Intl
10h 00m
1 stop
ONT5:37 pmOntario
$466
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 August 20, 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

Fri 9/19

10:35 pm-7:42 pm

2 stops20h 07m

San José Juan Santamaria Intl

Wed 9/24

7:27 am-10:33 pm

1 stop16h 06m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 9/23

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Tue 10/7

3:05 pm-9:55 pm

1 stop7h 50m

$362

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 9/23

12:47 pm-5:57 pm

1 stop28h 10m

San José Juan Santamaria Intl

Tue 9/30

6:00 am-9:24 pm

2 stops16h 24m

$364

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 9/13

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Tue 9/23

3:05 pm-9:55 pm

1 stop7h 50m

$368

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 9/26

10:00 pm-12:08 pm

1 stop13h 08m

San José Juan Santamaria Intl

Fri 10/3

1:35 pm-10:23 pm

1 stop9h 48m

$430

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 9/8

6:50 pm-7:15 am

1 stop11h 25m

San José Juan Santamaria Intl

Wed 9/17

1:30 pm-9:25 pm

1 stop8h 55m

$453

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 9/17

6:50 pm-7:15 am

1 stop11h 25m

San José Juan Santamaria Intl

Mon 9/22

8:37 am-8:33 pm

1 stop12h 56m

$462

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sun 10/5

10:00 pm-12:00 pm

1 stop13h 00m

Liberia

Thu 10/9

1:25 pm-10:22 pm

1 stop9h 57m

$536

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Wed 9/10

6:00 am-6:20 am

3 stops23h 20m

Liberia

Wed 9/17

11:20 am-10:44 am

3 stops24h 24m

$596

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Wed 9/10

6:00 am-6:20 am

3 stops23h 20m

Liberia

Wed 9/17

11:20 am-10:44 am

2 stops24h 24m

$610

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $423, 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 August is your next best option. Flight prices from Ontario to Costa Rica during August average around $440.

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.

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
AviancaPriceFrom $317Free CancellationRating
6.7
2,411 reviews
Search Avianca flights
United AirlinesPriceFrom $349Free CancellationRating
7.4
8,928 reviews
Search United Airlines flights
American AirlinesPriceFrom $399Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $550Free CancellationRating
8.0
4,246 reviews
Search Southwest 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.

An easier way to manage your Costa Rica trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 8/25
Mon 9/1
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Costa Rica