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$394+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
ene. 15 — ene. 221
jue. 1/15
jue. 1/22
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 diciembre 16, 2025.

This Finnair deal was found by Cheapflights users on 12/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/1810:50 amONT - DUB
1 stop12h 20mMultiple Airlines
dom. 12/2812:55 pmDUB - ONT
1 stop17h 19mMultiple Airlines
Deal found 12/15$1,449
This United Airlines deal was found by Cheapflights users on 12/15. 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.
jue. 12/186:04 amONT - DUB
2 stops17h 26mUnited Airlines
vie. 12/2610:40 amDUB - ONT
1 stop19h 45mUnited Airlines
Deal found 12/15$1,453
This oojo deal was found by Cheapflights users on 12/14. 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.
lun. 12/154:47 pmONT - DUB
2 stops16h 18mBritish Airways
lun. 12/228:40 pmDUB - ONT
2 stops33h 16mBritish Airways
Deal found 12/14$1,521
This United Airlines deal was found by Cheapflights users on 12/15. 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.
mar. 12/165:05 amONT - DUB
2 stops20h 50mUnited Airlines
dom. 12/2810:40 amDUB - ONT
2 stops31h 21mUnited Airlines
Deal found 12/15$1,543
This oojo deal was found by Cheapflights users on 12/14. 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.
sáb. 12/2711:59 pmONT - DUB
2 stops27h 16mBritish Airways
lun. 1/58:40 pmDUB - ONT
2 stops30h 05mBritish Airways
Deal found 12/14$1,694
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/236:00 amONT - DUB
2 stops18h 10mUnited Airlines
mié. 12/3110:40 amDUB - ONT
2 stops19h 53mUnited Airlines
Deal found 12/14$1,757
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/226:00 amONT - DUB
2 stops18h 10mUnited Airlines
sáb. 12/2710:40 amDUB - ONT
1 stop19h 45mUnited Airlines
Deal found 12/14$1,817
This Finnair deal was found by Cheapflights users on 12/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1910:50 amONT - DUB
1 stop12h 20mMultiple Airlines
dom. 12/2812:55 pmDUB - ONT
1 stop17h 19mMultiple Airlines
Deal found 12/15$1,869
This United Airlines deal was found by Cheapflights users on 12/16. 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. 12/175:05 amONT - DUB
2 stops18h 25mUnited Airlines
dom. 12/2810:40 amDUB - ONT
1 stop19h 45mUnited Airlines
Deal found 12/16$1,937
This Trip.com deal was found by Cheapflights users on 12/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/2712:46 pmONT - DUB
1 stop34h 24mIberia
lun. 1/512:55 pmDUB - ONT
1 stop17h 19mIberia
Deal found 12/14$2,011
This Finnair deal was found by Cheapflights users on 12/13. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/2710:50 amONT - DUB
1 stop12h 20mMultiple Airlines
sáb. 1/312:55 pmDUB - ONT
1 stop18h 51mMultiple Airlines
Deal found 12/13$2,032
This oojo deal was found by Cheapflights users on 12/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/1710:47 amONT - DUB
2 stops41h 58mIberia
dom. 12/286:15 amDUB - ONT
2 stops23h 59mIberia
Deal found 12/15$2,119

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 diciembre 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$484
(American Airlines)

One-way from

$394
(Priceline)

Popular in

June

Cheapest in

February

Average price

$819
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 ($182 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 December 2025
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 diciembre 16, 2025.
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

mar. 2/17

5:06 pm-4:45 pm

2 stops15h 39m

Shannon

vie. 2/27

7:50 am-10:49 pm

2 stops22h 59m

$484

OntarioDublin

ONT - DUB

ONTDUB

Ontario

lun. 4/13

7:00 am-9:45 am

1 stop18h 45m

Dublin

mar. 4/21

9:50 am-8:46 pm

2 stops42h 56m

$629

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mié. 1/7

5:05 am-8:10 am

2 stops19h 05m

Dublin

mié. 1/14

9:00 am-9:58 pm

2 stops44h 58m

$629

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mié. 4/15

7:00 am-9:45 am

1 stop18h 45m

Dublin

mar. 4/21

9:50 am-8:46 pm

2 stops42h 56m

$629

OntarioDublin

ONT - DUB

ONTDUB

Ontario

lun. 4/13

7:00 am-9:45 am

1 stop18h 45m

Dublin

mié. 4/22

9:50 am-8:46 pm

2 stops42h 56m

$629

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mar. 2/17

8:00 am-7:30 am

2 stops15h 30m

Dublin

vie. 2/27

9:00 am-9:59 pm

2 stops20h 59m

$652

OntarioCork

ONT - ORK

ONTORK

Ontario

mar. 2/17

3:19 pm-3:25 pm

2 stops16h 06m

Cork

vie. 2/27

7:40 am-6:39 pm

2 stops18h 59m

$654

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mar. 4/14

7:00 am-7:20 am

2 stops16h 20m

Dublin

mar. 4/28

9:50 am-8:46 pm

2 stops18h 56m

$656

OntarioDublin

ONT - DUB

ONTDUB

Ontario

jue. 4/30

7:00 am-7:20 am

2 stops16h 20m

Dublin

jue. 5/7

9:50 am-10:26 pm

2 stops44h 36m

$666

OntarioDublin

ONT - DUB

ONTDUB

Ontario

sáb. 3/28

11:59 pm-7:20 am

2 stops23h 21m

Dublin

dom. 4/5

9:50 am-5:47 pm

2 stops39h 57m

$666

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 50 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 $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.

What is the cheapest time of day to fly from ONT to IE?

Find hourly flight availability from Ontario to Ireland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated diciembre 16, 2025.

When flying from Ontario to Ireland, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 25% versus a flight in the afternoon.

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 diciembre 16, 2025.
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
8,008 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

7.9

Boarding

8.1

Crew

8.5

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
8,008 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

7.9

Boarding

8.1

Crew

8.5

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
11,049 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

7.9

Boarding

8.1

Crew

8.5

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
3,051 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

7.9

Boarding

8.1

Crew

8.5

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 American Airlines, United Airlines, and British Airways fly from Ontario to Ireland in about 15h 39m. The time it takes to get you to your destination can typically vary by up to 3h 06m. 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 - Cork or Ontario - Shannon 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 $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

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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 diciembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$891FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$677Average$975FlexibilityNo cancel feeOn-time71%

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