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Ireland

$247+ Cheap flights from Ontario (ONT) to Ireland

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap flight deals from Ontario to Ireland

Cheapest flights from Ontario to Ireland
Explore the most affordable flight options available from Ontario to Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.

This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Wed 10/2112:30 pm
SNN
-
ONT
2 stops17h 56m
United Airlines
Deal found 2/10$569
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:00 am
ONT
-
DUB
2 stops18h 30m
United Airlines
Wed 3/49:00 am
DUB
-
ONT
2 stops45h 36m
United Airlines
Deal found 2/9$631
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/301:33 pm
ONT
-
SNN
2 stops33h 57m
United Airlines
Fri 6/129:30 am
SNN
-
ONT
2 stops15h 48m
United Airlines
Deal found 2/11$634
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/236:37 pm
ONT
-
DUB
2 stops28h 53m
United Airlines
Tue 3/31:35 pm
DUB
-
ONT
3 stops36h 06m
United Airlines
Deal found 2/9$647
This KLM deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/47:00 am
ONT
-
DUB
1 stop16h 45m
KLM
Wed 11/119:45 am
DUB
-
ONT
1 stop16h 33m
KLM
Deal found 2/9$655
This Iberia deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:57 am
ONT
-
DUB
1 stop14h 48m
Iberia
Tue 11/31:00 pm
DUB
-
ONT
1 stop17h 23m
Iberia
Deal found 2/11$656
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/210:20 pm
ONT
-
DUB
1 stop25h 25m
Delta
Tue 3/175:55 am
DUB
-
ONT
2 stops18h 18m
Delta
Deal found 2/9$657
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:00 am
ONT
-
DUB
2 stops15h 30m
United Airlines
Thu 3/129:30 am
DUB
-
ONT
2 stops18h 20m
United Airlines
Deal found 2/9$658
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/185:15 am
ONT
-
DUB
2 stops19h 15m
United Airlines
Wed 3/2510:40 am
DUB
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/11$659
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Fri 5/112:30 pm
SNN
-
ONT
2 stops18h 29m
United Airlines
Deal found 2/8$660
This Iberia deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3110:56 am
ONT
-
DUB
1 stop14h 49m
Iberia
Tue 4/79:30 am
DUB
-
ONT
1 stop19h 24m
Iberia
Deal found 2/10$660
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/1511:59 pm
ONT
-
DUB
1 stop25h 11m
United Airlines
Wed 3/2510:40 am
DUB
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/10$661

Find flight deals from Ontario to Ireland

Keep the following information in mind while searching for Ontario to Ireland flight deals. Data was last updated February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$631
(United Airlines)

One-way from

$247
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$604
Provider with most accurate pricing for Los Angeles-Dublin flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Dublin flights.
Search Deals
From Ontario to Ireland
Search Deals
One-way flight from Ontario to Ireland
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($176 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Ireland 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, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from Ontario to Ireland that are best for you.

Fly from

Ontario

Fly to

Ireland

Route

Depart

Return

Price

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 5/30

1:33 pm-7:30 am

2 stops33h 57m

Shannon

Fri 6/12

9:30 am-5:18 pm

2 stops15h 48m

$634

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 3/2

10:20 pm-7:45 am

1 stop25h 25m

Dublin

Tue 3/17

5:55 am-5:13 pm

2 stops18h 18m

$657

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 2/25

8:00 am-7:30 am

2 stops15h 30m

Dublin

Thu 3/12

9:30 am-8:50 pm

2 stops18h 20m

$658

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 3/18

5:15 am-8:10 am

2 stops19h 55m

Dublin

Wed 3/25

9:30 am-10:36 pm

2 stops20h 06m

$659

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 4/23

6:05 am-10:15 am

2 stops20h 10m

Shannon

Fri 5/1

12:30 pm-10:30 pm

2 stops18h 00m

$660

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 4/24

7:00 am-10:15 am

2 stops19h 15m

Shannon

Fri 5/1

12:30 pm-10:59 pm

2 stops18h 29m

$660

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 4/21

7:00 am-10:15 am

2 stops19h 15m

Shannon

Sun 4/26

12:30 pm-8:36 pm

2 stops16h 06m

$660

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/6

7:00 am-9:45 am

1 stop18h 45m

Dublin

Wed 4/15

11:35 am-10:26 pm

1 stop18h 51m

$660

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 3/15

11:59 pm-8:10 am

1 stop25h 11m

Dublin

Wed 3/25

10:40 am-10:18 pm

1 stop18h 38m

$661

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 3/16

10:25 pm-7:45 am

1 stop26h 20m

Dublin

Wed 3/25

11:30 am-11:51 pm

2 stops19h 21m

$666

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 46 results
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2
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5

Best time to book a flight from Ontario to Ireland

Have a flexible travel schedule? Discover the best time to fly to Ireland from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Ireland

What is the cheapest month to book a flight from Ontario to Ireland?

Currently, January is the cheapest month in which you can book a flight from Ontario to Ireland (average of $436). Flying from Ontario to Ireland in June is currently the most expensive (average of $747). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Ireland

Get insights into the airlines that provide service to Ireland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ireland. Reviews last updated February 11, 2026.
Read through reviews of airlines operating flights from Ontario to Ireland, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,267 reviews

Crew

8.0

Entertainment

6.9

Comfort

7.2

Boarding

7.5

Overall

7.2

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.
American Airlines
7.2
Good
11,267 reviews
American Airlines
7.2
Good
11,267 reviews

Crew

8.0

Entertainment

6.9

Comfort

7.2

Boarding

7.5

Overall

7.2

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Ireland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Ireland?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ireland from Ontario.

  • How long is the flight from Ontario to Ireland?

    Airlines like United Airlines, American Airlines, and KLM fly from Ontario to Ireland in about 15h 48m. The time it takes to get you to your destination can typically vary by up to 9h 37m. There are 5132 mi between Ontario and Ireland. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Ontario to Ireland?

    When deciding which route to take from Ontario to Ireland consider Ontario - Dublin, Ontario - Shannon or Ontario - Cork as they are the most popular.

  • Can I find deals for flights from Ontario to Ireland that include hotel bookings?

    Yes. In addition to deals on Ontario to Ireland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Ireland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Ireland.

  • Can I find deals for business class flights from Ontario to Ireland?

    Yes. Cheapflights offers flight deals from Ontario to Ireland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Ireland?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Ireland (average of $436). Flying from Ontario to Ireland in June is currently the most expensive (average of $747). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ontario to Ireland

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Ontario to Ireland

Discover the top airline that operate flights from Ontario to Ireland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$890FlexibilityNo cancel feeOn-time71%

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