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$178+ 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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
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Cheap flight deals from Ontario to Ireland

Keep the following information in mind while searching for Ontario to Ireland flight deals. Data was last updated January 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$408
(oojo)

One-way from

$178
(oojo)

Popular in

June

Cheapest in

February

Average price

$608
Provider with most accurate pricing for Los Angeles-Dublin flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Dublin flights.
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From Ontario to Ireland
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One-way flight from Ontario to Ireland
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Highest demand for flights based on searches. 19% potential increase in price ($174 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 January 15, 2026.

This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/165:02 pm
ONT
-
SNN
2 stops18h 23m
British Airways
Thu 2/267:50 am
SNN
-
ONT
2 stops21h 34m
British Airways
Deal found 1/13$408
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/42:39 pm
ONT
-
SNN
2 stops18h 06m
British Airways
Wed 3/187:50 am
SNN
-
ONT
2 stops23h 09m
British Airways
Deal found 1/13$420
This oojo deal was found by Cheapflights users on 1/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/84:54 pm
ONT
-
SNN
2 stops39h 16m
British Airways
Sat 8/225:30 pm
SNN
-
ONT
2 stops30h 54m
British Airways
Deal found 1/14$464
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2310:59 am
ONT
-
SNN
2 stops16h 21m
British Airways
Wed 5/67:40 am
SNN
-
ONT
2 stops22h 55m
British Airways
Deal found 1/13$470
This oojo deal was found by Cheapflights users on 1/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/132:39 pm
ONT
-
SNN
2 stops17h 06m
British Airways
Wed 2/187:50 am
SNN
-
ONT
2 stops19h 55m
British Airways
Deal found 1/12$471
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/103:09 pm
ONT
-
DUB
2 stops16h 31m
British Airways
Tue 2/177:45 pm
DUB
-
ONT
2 stops28h 34m
British Airways
Deal found 1/13$476
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/17:00 am
ONT
-
DUB
2 stops20h 15m
British Airways
Tue 3/317:30 am
DUB
-
ONT
2 stops23h 19m
British Airways
Deal found 1/13$480
This United Airlines deal was found by Cheapflights users on 1/15. 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 3/307:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 4/79:50 am
DUB
-
ONT
2 stops34h 24m
United Airlines
Deal found 1/15$483
This Air Canada deal was found by Cheapflights users on 1/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/225:00 am
ONT
-
DUB
2 stops18h 10m
Air Canada
Wed 3/118:00 am
DUB
-
ONT
2 stops43h 50m
Air Canada
Deal found 1/13$487
This oojo deal was found by Cheapflights users on 1/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/43:09 pm
ONT
-
DUB
2 stops16h 31m
British Airways
Wed 2/117:45 pm
DUB
-
ONT
2 stops33h 39m
British Airways
Deal found 1/14$489
This United Airlines deal was found by Cheapflights users on 1/13. 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 4/157:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Wed 4/2912:30 pm
SNN
-
ONT
2 stops18h 15m
United Airlines
Deal found 1/13$493
This United Airlines deal was found by Cheapflights users on 1/15. 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 2/211:45 pm
ONT
-
DUB
2 stops34h 25m
United Airlines
Fri 3/69:00 am
DUB
-
ONT
2 stops35h 48m
United Airlines
Deal found 1/15$493

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 January 15, 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

Mon 2/16

5:02 pm-7:25 pm

2 stops18h 23m

Shannon

Thu 2/26

7:50 am-10:29 pm

2 stops22h 39m

$421

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 4/23

10:59 am-11:20 am

2 stops16h 21m

Shannon

Wed 5/6

7:40 am-10:35 pm

2 stops22h 55m

$470

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 2/13

2:39 pm-3:45 pm

2 stops17h 06m

Shannon

Wed 2/18

7:50 am-7:45 pm

2 stops19h 55m

$471

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 3/30

7:00 am-11:10 am

2 stops20h 10m

Dublin

Tue 4/7

9:50 am-12:14 pm

2 stops34h 24m

$487

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Wed 4/15

7:00 am-10:15 am

2 stops19h 15m

Shannon

Wed 4/29

12:30 pm-10:45 pm

2 stops18h 15m

$493

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 2/21

1:45 pm-8:10 am

2 stops34h 25m

Dublin

Fri 3/6

9:00 am-12:48 pm

2 stops35h 48m

$493

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 1/31

7:16 am-11:30 am

2 stops20h 14m

Shannon

Sat 2/7

5:25 pm-10:48 pm

2 stops37h 23m

$508

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/27

7:00 am-9:45 am

1 stop18h 45m

Dublin

Tue 5/5

11:35 am-10:26 pm

1 stop18h 51m

$510

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 2/6

7:16 am-11:30 am

2 stops20h 14m

Shannon

Sat 2/14

5:25 pm-10:07 pm

2 stops36h 42m

$521

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 2/27

5:00 am-7:10 am

2 stops42h 10m

Dublin

Wed 3/11

8:00 am-8:50 pm

2 stops43h 50m

$537

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 45 results
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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 $455). Flying from Ontario to Ireland in June is currently the most expensive (average of $682). 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 January 15, 2026.
Read through reviews of airlines operating flights from Ontario to Ireland, such as Delta, American Airlines, and Iberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,051 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,051 reviews
Delta
7.9
Good
8,051 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
11,136 reviews
Delta
7.9
Good
8,051 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
3,087 reviews
Delta
7.9
Good
8,051 reviews

Food

7.2

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 British Airways and United Airlines fly from Ontario to Ireland in about 18h 23m. The time it takes to get you to your destination can typically vary by up to 1h 47m. There are 5072 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 $455). Flying from Ontario to Ireland in June is currently the most expensive (average of $682). 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 3 airlines flying from Ontario to Ireland

Discover the top 3 airlines 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 January 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$891FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$683Average$975FlexibilityNo cancel feeOn-time71%

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