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Ireland

$354+ 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 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Jun 21 — Jun 281
Sun 6/21
Sun 6/28
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 May 22, 2026.

This KLM deal was found by Cheapflights users on 5/18. 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.
Tue 9/87:00 am
ONT
-
SNN
2 stops20h 10m
KLM
Wed 9/161:05 pm
SNN
-
ONT
2 stops18h 39m
KLM
Deal found 5/18$764
This United Airlines deal was found by Cheapflights users on 5/19. 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 10/176:32 pm
ONT
-
SNN
2 stops31h 43m
United Airlines
Wed 10/2112:30 pm
SNN
-
ONT
2 stops17h 56m
United Airlines
Deal found 5/19$820
This United Airlines deal was found by Cheapflights users on 5/18. 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 9/147:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Tue 9/229:30 am
SNN
-
ONT
1 stop18h 27m
United Airlines
Deal found 5/18$841
This Air Canada deal was found by Cheapflights users on 5/20. 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.
Mon 10/196:05 am
ONT
-
DUB
2 stops41h 40m
Air Canada
Wed 11/49:00 am
DUB
-
ONT
2 stops43h 20m
Air Canada
Deal found 5/20$848
This Air Canada deal was found by Cheapflights users on 5/20. 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 10/185:00 am
ONT
-
DUB
2 stops43h 15m
Air Canada
Wed 11/49:00 am
DUB
-
ONT
2 stops43h 20m
Air Canada
Deal found 5/20$856
This CheapOair deal was found by Cheapflights users on 5/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:00 am
ONT
-
DUB
2 stops18h 45m
Air Canada
Wed 9/169:50 am
DUB
-
ONT
2 stops16h 26m
Air Canada
Deal found 5/17$871
This United Airlines deal was found by Cheapflights users on 5/20. 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 10/187:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Wed 11/49:00 am
DUB
-
ONT
2 stops21h 26m
United Airlines
Deal found 5/20$872
This Delta deal was found by Cheapflights users on 5/20. 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.
Tue 10/2012:00 pm
ONT
-
DUB
1 stop12h 45m
Delta
Thu 11/59:40 am
DUB
-
ONT
1 stop20h 34m
Delta
Deal found 5/20$875
This United Airlines deal was found by Cheapflights users on 5/20. 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 10/215:00 am
ONT
-
DUB
2 stops20h 45m
United Airlines
Thu 11/512:05 pm
DUB
-
ONT
2 stops18h 21m
United Airlines
Deal found 5/20$879
This Iberia deal was found by Cheapflights users on 5/18. 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.
Sun 9/612:33 pm
ONT
-
DUB
1 stop13h 12m
Iberia
Tue 9/1512:40 pm
DUB
-
ONT
1 stop14h 17m
Iberia
Deal found 5/18$880
This Air Canada deal was found by Cheapflights users on 5/20. 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.
Mon 10/196:05 am
ONT
-
DUB
2 stops41h 40m
Air Canada
Sun 11/19:00 am
DUB
-
ONT
2 stops43h 20m
Air Canada
Deal found 5/20$881
This KAYAK deal was found by Cheapflights users on 5/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1711:50 pm
ONT
-
DUB
1 stop25h 10m
JetBlue
Thu 9/1711:30 am
DUB
-
ONT
1 stop16h 43m
JetBlue
Deal found 5/19$888

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 May 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$764
(KLM)

One-way from

$354
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$902
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. 23% potential increase in price ($234 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 22, 2026.
Use the filters below to find and compare flights from Ontario to Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 9/8

7:00 am-11:10 am

2 stops20h 10m

Shannon

Wed 9/16

1:05 pm-11:44 pm

2 stops18h 39m

$764

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 10/17

7:00 am-10:15 am

2 stops43h 15m

Shannon

Wed 10/21

12:30 pm-10:26 pm

2 stops17h 56m

$831

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 9/14

7:00 am-7:30 am

1 stop16h 30m

Shannon

Tue 9/22

9:30 am-7:57 pm

1 stop18h 27m

$841
Quickest round-trip

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/16

7:00 am-7:45 am

1 stop16h 45m

Dublin

Wed 11/25

9:45 am-6:18 pm

1 stop16h 33m

$875

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 7/26

6:10 am-7:30 am

1 stop17h 20m

Shannon

Wed 8/5

9:30 am-10:51 pm

1 stop21h 21m

$897

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/18

7:00 am-7:45 am

1 stop16h 45m

Dublin

Thu 12/3

9:40 am-6:18 pm

1 stop16h 38m

$915

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 8/17

7:00 am-7:30 am

1 stop16h 30m

Shannon

Sat 8/22

9:30 am-12:12 pm

2 stops34h 42m

$918

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 9/5

11:24 pm-9:00 am

1 stop25h 36m

Dublin

Fri 9/11

11:30 am-8:13 pm

1 stop16h 43m

$920

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 8/18

9:01 am-9:45 am

2 stops16h 44m

Dublin

Tue 9/1

9:50 am-7:57 pm

3 stops42h 07m

$932

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 9/4

10:59 pm-8:45 am

1 stop25h 46m

Dublin

Tue 11/10

9:40 am-6:18 pm

1 stop16h 38m

$934

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/20

Showing 1-10 of 42 resultsSorted by cheapest first
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2
3
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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
No data available for this route at this time. Please check back soon.

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 May 22, 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
7.1
Good
11,644 reviews

Overall

7.1

Boarding

7.5

Entertainment

6.9

Comfort

7.2

Crew

7.9

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Apr 2026

DFW - BDL

They keep changing the gate, delaying the hours and then finally canceled it. No accomodation, no food, nothing!
American Airlines
7.1
Good
11,644 reviews
American Airlines
7.1
Good
11,644 reviews

Overall

7.1

Boarding

7.5

Entertainment

6.9

Comfort

7.2

Crew

7.9

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Apr 2026

DFW - BDL

They keep changing the gate, delaying the hours and then finally canceled it. No accomodation, no food, nothing!

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 KLM, United Airlines, and JetBlue fly from Ontario to Ireland in about 20h 10m. The time it takes to get you to your destination can typically vary by up to 23h 05m. 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.

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 May 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$879FlexibilityNo cancel feeOn-time71%

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