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Ireland

$326+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Nov 21 — Nov 281
Fri 11/21
Fri 11/28
1 adult, Economy
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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 October 22, 2025.

This United Airlines deal was found by Cheapflights users on 10/21. 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 11/55:05 amONT - DUB
2 stops21h 15mUnited Airlines
Wed 11/129:00 amDUB - ONT
2 stops45h 31mUnited Airlines
Deal found 10/21$529
This American Airlines deal was found by Cheapflights users on 10/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2712:48 pmONT - DUB
2 stops16h 47mAmerican Airlines
Wed 11/1211:30 amDUB - ONT
2 stops30h 27mAmerican Airlines
Deal found 10/20$534
This KLM deal was found by Cheapflights users on 10/21. 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.
Wed 10/2211:36 amONT - DUB
1 stop13h 09mKLM
Wed 11/59:45 amDUB - ONT
1 stop17h 34mKLM
Deal found 10/21$542
This KLM deal was found by Cheapflights users on 10/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/219:50 amONT - DUB
2 stops14h 05mKLM
Wed 11/59:45 amDUB - ONT
1 stop17h 34mKLM
Deal found 10/20$543
This United Airlines deal was found by Cheapflights users on 10/20. 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 10/297:00 amONT - DUB
1 stop18h 10mUnited Airlines
Wed 11/510:40 amDUB - ONT
1 stop19h 51mUnited Airlines
Deal found 10/20$553
This Delta deal was found by Cheapflights users on 10/20. 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.
Sun 11/96:00 amONT - DUB
2 stops25h 45mDelta
Tue 11/255:55 amDUB - ONT
2 stops25h 09mDelta
Deal found 10/20$556
This United Airlines deal was found by Cheapflights users on 10/21. 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 10/297:00 amONT - DUB
2 stops17h 30mUnited Airlines
Thu 11/612:05 pmDUB - ONT
2 stops18h 46mUnited Airlines
Deal found 10/21$557
This Delta deal was found by Cheapflights users on 10/21. 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.
Sun 10/2610:00 pmONT - DUB
1 stop26h 45mDelta
Tue 11/115:55 amDUB - ONT
2 stops25h 00mDelta
Deal found 10/21$558
This United Airlines deal was found by Cheapflights users on 10/20. 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 12/2811:59 pmONT - DUB
1 stop24h 11mUnited Airlines
Fri 1/910:40 amDUB - ONT
2 stops19h 18mUnited Airlines
Deal found 10/20$563
This United Airlines deal was found by Cheapflights users on 10/20. 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 11/57:00 amONT - DUB
1 stop17h 10mUnited Airlines
Wed 11/1912:05 pmDUB - ONT
2 stops18h 46mUnited Airlines
Deal found 10/20$578
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/81:15 pmONT - ORK
2 stops43h 30mDelta
Wed 11/1211:15 amORK - ONT
2 stops36h 54mDelta
Deal found 10/19$871
This American Airlines deal was found by Cheapflights users on 10/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/812:46 pmONT - SNN
2 stops38h 44mAmerican Airlines
Tue 11/117:50 amSNN - ONT
2 stops22h 39mAmerican Airlines
Deal found 10/19$1,063

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 October 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$529
(United Airlines)

One-way from

$326
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$651
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
Search Deals
One-way flight from Ontario to Ireland
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($177 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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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 October 22, 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

Sun 11/9

7:00 am-8:10 am

1 stop17h 10m

Dublin

Tue 11/25

10:40 am-10:31 pm

1 stop19h 51m

$553

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/5

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 11/19

12:05 pm-10:51 pm

2 stops18h 46m

$578

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/5

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 11/12

10:40 am-10:31 pm

1 stop19h 51m

$578

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/4

6:05 am-7:30 am

2 stops17h 25m

Dublin

Tue 11/18

10:40 am-9:49 pm

2 stops19h 09m

$582

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/4

6:05 am-7:30 am

2 stops17h 25m

Dublin

Tue 11/11

9:30 am-9:49 pm

2 stops20h 19m

$582

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/10

7:00 am-8:10 am

1 stop17h 10m

Dublin

Mon 11/17

10:40 am-6:36 pm

1 stop15h 56m

$594

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/20

12:55 pm-9:45 am

1 stop12h 50m

Dublin

Mon 5/4

1:45 pm-9:56 pm

1 stop16h 11m

$690

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 4/1

7:00 am-9:45 am

1 stop18h 45m

Dublin

Sun 4/5

11:35 am-10:26 pm

1 stop18h 51m

$690

OntarioCork

ONT - ORK

ONTORK

Ontario

Wed 4/1

1:00 pm-10:35 pm

2 stops25h 35m

Cork

Sun 4/5

5:10 pm-10:38 pm

2 stops37h 28m

$697

OntarioCork

ONT - ORK

ONTORK

Ontario

Tue 2/17

3:05 pm-3:25 pm

2 stops16h 20m

Cork

Wed 2/25

11:55 am-9:57 pm

2 stops18h 02m

$746

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 35 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 $420). 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 October 22, 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 42% 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 October 22, 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
7,981 reviews

Overall

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
7,981 reviews
Delta
7.9
Good
7,981 reviews

Overall

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
11,029 reviews
Delta
7.9
Good
7,981 reviews

Overall

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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
2,996 reviews
Delta
7.9
Good
7,981 reviews

Overall

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

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, Delta, and American Airlines fly from Ontario to Ireland in about 17h 10m. The time it takes to get you to your destination can typically vary by up to 8h 25m. 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 cheapest airlines to fly from Ontario to Ireland one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $460. However, be on the lookout for offers from United Airlines and KLM, as they are both options that can get you from Ontario to Ireland for a low price.

  • 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 $420). 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.

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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 October 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$786FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$677Average$932FlexibilityNo cancel feeOn-time71%

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