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$378+ 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
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 August 14, 2025.

Round-trip from

$486
(American Airlines)

One-way from

$378
(Priceline)

Popular in

June

Cheapest in

January

Average price

$741
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 ($178 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 August 2025
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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 August 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2912:47 pmONT - DUB
2 stops15h 28mAmerican Airlines
Thu 11/611:30 amDUB - ONT
2 stops18h 29mAmerican Airlines
Deal found 8/12$486
This United Airlines deal was found by Cheapflights users on 8/11. 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.
Sun 10/127:02 amONT - DUB
1 stop18h 43mUnited Airlines
Wed 10/229:50 amDUB - ONT
2 stops20h 40mUnited Airlines
Deal found 8/11$547
This Iberia deal was found by Cheapflights users on 8/11. 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.
Mon 9/110:50 amONT - DUB
1 stop14h 55mIberia
Tue 9/1612:40 pmDUB - ONT
1 stop14h 14mIberia
Deal found 8/11$552
This United Airlines deal was found by Cheapflights users on 8/11. 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.
Sun 10/127:02 amONT - DUB
1 stop18h 43mUnited Airlines
Fri 10/2411:35 amDUB - ONT
1 stop18h 55mUnited Airlines
Deal found 8/11$553
This United Airlines deal was found by Cheapflights users on 8/11. 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 10/116:51 pmONT - DUB
2 stops30h 54mUnited Airlines
Thu 10/239:20 amDUB - ONT
2 stops21h 10mUnited Airlines
Deal found 8/11$557
This Iberia deal was found by Cheapflights users on 8/11. 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.
Sat 10/112:51 pmONT - DUB
1 stop34h 54mIberia
Thu 10/2312:40 pmDUB - ONT
1 stop14h 22mIberia
Deal found 8/11$558
This Iberia deal was found by Cheapflights users on 8/11. 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.
Mon 9/18:14 amONT - DUB
1 stop17h 31mIberia
Wed 4/111:45 amDUB - ONT
1 stop18h 17mIberia
Deal found 8/11$573
This Iberia deal was found by Cheapflights users on 8/11. 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.
Sun 8/312:31 pmONT - DUB
1 stop35h 14mIberia
Thu 4/211:45 amDUB - ONT
1 stop18h 17mIberia
Deal found 8/11$578
This Iberia deal was found by Cheapflights users on 8/14. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2010:57 amONT - DUB
1 stop14h 48mIberia
Sun 11/212:55 pmDUB - ONT
1 stop19h 02mIberia
Deal found 8/14$582
This Iberia deal was found by Cheapflights users on 8/11. 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.
Mon 10/62:51 pmONT - DUB
1 stop34h 54mIberia
Tue 10/2112:40 pmDUB - ONT
1 stop18h 02mIberia
Deal found 8/11$583
This Iberia deal was found by Cheapflights users on 8/11. 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.
Mon 9/110:50 amONT - DUB
1 stop14h 55mIberia
Mon 3/3011:45 amDUB - ONT
1 stop18h 17mIberia
Deal found 8/11$596
This United Airlines deal was found by Cheapflights users on 8/14. 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.
Sat 9/137:00 amONT - SNN
1 stop16h 30mUnited Airlines
Wed 9/249:30 amSNN - ONT
1 stop21h 00mUnited Airlines
Deal found 8/14$666

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 August 14, 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

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

12:47 pm-11:15 am

2 stops15h 28m

Dublin

Thu 11/6

11:30 am-9:59 pm

2 stops18h 29m

$486

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 10/14

7:02 am-9:45 am

1 stop18h 43m

Dublin

Wed 10/22

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 10/12

7:02 am-9:45 am

1 stop18h 43m

Dublin

Wed 10/22

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 10/13

7:02 am-9:45 am

1 stop18h 43m

Dublin

Wed 10/22

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/15

7:02 am-9:45 am

1 stop18h 43m

Dublin

Tue 10/21

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/15

7:02 am-9:45 am

1 stop18h 43m

Dublin

Wed 10/22

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 10/12

7:02 am-9:45 am

1 stop18h 43m

Dublin

Tue 10/21

9:50 am-8:24 pm

2 stops18h 34m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 10/13

7:02 am-9:45 am

1 stop18h 43m

Dublin

Tue 10/21

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 10/14

7:02 am-9:45 am

1 stop18h 43m

Dublin

Tue 10/21

9:50 am-10:30 pm

2 stops20h 40m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 9/1

10:50 am-9:45 am

1 stop14h 55m

Dublin

Tue 9/16

12:40 pm-6:54 pm

1 stop14h 14m

$552

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

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, November is the cheapest month in which you can book a flight from Ontario to Ireland (average of $509). Flying from Ontario to Ireland in June is currently the most expensive (average of $925). 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 August 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Ireland as you normally would.

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 August 14, 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
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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
10,000 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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
2,878 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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.

  • 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 $509). Flying from Ontario to Ireland in June is currently the most expensive (average of $925). 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$823FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$770FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$623Average$966FlexibilityNo cancel feeOn-time71%

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