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$341+ 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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
feb. 24 — mar. 31
mar. 2/24
mar. 3/3
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 enero 25, 2026.

This United Airlines deal was found by Cheapflights users on 1/22. 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.
lun. 3/307:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
mar. 4/79:50 am
DUB
-
ONT
2 stops44h 55m
United Airlines
Deal found 1/22$483
This United Airlines deal was found by Cheapflights users on 1/23. 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.
mié. 9/27:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
mié. 9/912:30 pm
SNN
-
ONT
2 stops16h 51m
United Airlines
Deal found 1/23$516
This United Airlines deal was found by Cheapflights users on 1/22. 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.
lun. 3/911:59 pm
ONT
-
DUB
1 stop25h 11m
United Airlines
mié. 3/189:30 am
DUB
-
ONT
2 stops20h 06m
United Airlines
Deal found 1/22$516
This United Airlines deal was found by Cheapflights users on 1/22. 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.
vie. 4/245:10 am
ONT
-
DUB
2 stops18h 10m
United Airlines
mar. 4/289:50 am
DUB
-
ONT
2 stops34h 48m
United Airlines
Deal found 1/22$537
This oojo deal was found by Cheapflights users on 1/23. 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.
mar. 4/142:08 pm
ONT
-
DUB
2 stops16h 42m
British Airways
mié. 5/611:10 am
DUB
-
ONT
2 stops19h 25m
British Airways
Deal found 1/23$541
This oojo deal was found by Cheapflights users on 1/23. 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.
vie. 4/32:39 pm
ONT
-
DUB
2 stops18h 36m
British Airways
lun. 4/137:00 pm
DUB
-
ONT
2 stops29h 22m
British Airways
Deal found 1/23$553
This British Airways deal was found by Cheapflights users on 1/22. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/56:00 am
ONT
-
SNN
2 stops29h 25m
British Airways
lun. 3/95:30 pm
SNN
-
ONT
2 stops36h 19m
British Airways
Deal found 1/22$561
This British Airways deal was found by Cheapflights users on 1/22. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 1/2911:59 pm
ONT
-
ORK
2 stops39h 26m
British Airways
lun. 2/24:05 pm
ORK
-
ONT
2 stops34h 40m
British Airways
Deal found 1/22$569
This United Airlines deal was found by Cheapflights users on 1/22. 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.
sáb. 9/57:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
sáb. 9/129:20 am
DUB
-
ONT
2 stops39h 58m
United Airlines
Deal found 1/22$578
This oojo deal was found by Cheapflights users on 1/22. 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.
vie. 5/12:08 pm
ONT
-
DUB
2 stops16h 42m
British Airways
lun. 5/118:30 pm
DUB
-
ONT
2 stops31h 57m
British Airways
Deal found 1/22$591
This Air Canada deal was found by Cheapflights users on 1/22. 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.
sáb. 9/57:00 am
ONT
-
DUB
2 stops17h 15m
Multiple Airlines
sáb. 9/129:20 am
DUB
-
ONT
3 stops35h 13m
Multiple Airlines
Deal found 1/22$594
This United Airlines deal was found by Cheapflights users on 1/23. 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.
dom. 7/57:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
mar. 7/219:30 am
SNN
-
ONT
1 stop20h 56m
United Airlines
Deal found 1/23$617

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 enero 25, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$483
(United Airlines)

One-way from

$341
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$600
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 ($175 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 enero 25, 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

OntarioDublin

ONT - DUB

ONTDUB

Ontario

lun. 3/30

7:00 am-9:45 am

1 stop18h 45m

Dublin

mar. 4/7

9:50 am-10:45 pm

2 stops44h 55m

$483

OntarioDublin

ONT - DUB

ONTDUB

Ontario

vie. 4/24

5:10 am-7:20 am

2 stops18h 10m

Dublin

mar. 4/28

9:50 am-12:38 pm

2 stops34h 48m

$537

OntarioShannon

ONT - SNN

ONTSNN

Ontario

jue. 3/5

6:00 am-7:25 pm

2 stops29h 25m

Shannon

lun. 3/9

5:30 pm-10:49 pm

2 stops36h 19m

$561

OntarioDublin

ONT - DUB

ONTDUB

Ontario

vie. 5/1

6:00 am-7:20 am

2 stops17h 20m

Dublin

lun. 5/11

11:35 am-10:30 pm

1 stop18h 55m

$614

OntarioShannon

ONT - SNN

ONTSNN

Ontario

dom. 7/5

7:00 am-7:30 am

1 stop16h 30m

Shannon

mar. 7/21

9:30 am-10:26 pm

1 stop20h 56m

$617

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mar. 3/10

6:15 am-7:30 am

2 stops18h 15m

Dublin

mar. 3/17

10:40 am-10:18 pm

1 stop18h 38m

$654

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mié. 3/18

6:00 am-7:30 am

2 stops18h 30m

Dublin

mié. 3/25

10:40 am-10:18 pm

1 stop18h 38m

$658

OntarioDublin

ONT - DUB

ONTDUB

Ontario

lun. 2/23

6:00 am-7:30 am

2 stops17h 30m

Dublin

lun. 3/2

9:00 am-10:57 pm

2 stops21h 57m

$688

OntarioDublin

ONT - DUB

ONTDUB

Ontario

sáb. 4/25

7:00 am-8:45 am

1 stop17h 45m

Dublin

jue. 5/7

11:00 am-6:15 pm

1 stop15h 15m

$691

OntarioShannon

ONT - SNN

ONTSNN

Ontario

jue. 2/5

6:00 am-11:30 am

2 stops21h 30m

Shannon

sáb. 2/14

5:25 pm-9:24 pm

2 stops35h 59m

$759

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/24

Showing 1-10 of 42 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, November is the cheapest month in which you can book a flight from Ontario to Ireland (average of $454). 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 enero 25, 2026.
Read through reviews of airlines operating flights from Ontario to Ireland, such as Delta and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,111 reviews

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Food

7.2

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
8,111 reviews
Delta
7.9
Good
8,111 reviews

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Food

7.2

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
11,197 reviews
Delta
7.9
Good
8,111 reviews

Overall

7.9

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Food

7.2

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 United Airlines and British Airways fly from Ontario to Ireland in about 18h 45m. The time it takes to get you to your destination can typically vary by up to 10h 40m. 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, November is the cheapest month in which you can book a flight from Ontario to Ireland (average of $454). 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 2 airlines flying from Ontario to Ireland

Discover the top 2 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 enero 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$683Average$890FlexibilityNo cancel feeOn-time71%

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