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$423+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
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 14, 2025.

This KLM deal was found by Cheapflights users on 10/14. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2011:36 amONT - DUB
1 stop13h 09mKLM
Wed 11/59:45 amDUB - ONT
1 stop17h 34mKLM
Deal found 10/14$543
This Delta deal was found by Cheapflights users on 10/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:05 amONT - DUB
1 stop16h 40mDelta
Thu 12/115:55 amDUB - ONT
2 stops24h 52mDelta
Deal found 10/14$551
This United Airlines deal was found by Cheapflights users on 10/14. 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.
Wed 10/297:00 amONT - DUB
1 stop18h 10mUnited Airlines
Thu 11/612:05 pmDUB - ONT
2 stops18h 46mUnited Airlines
Deal found 10/14$552
This American Airlines deal was found by Cheapflights users on 10/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/84:47 pmONT - DUB
2 stops16h 58mAmerican Airlines
Sun 12/1412:55 pmDUB - ONT
1 stop19h 00mAmerican Airlines
Deal found 10/14$593
This American Airlines deal was found by Cheapflights users on 10/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/64:47 pmONT - DUB
2 stops16h 58mAmerican Airlines
Thu 11/1311:30 amDUB - ONT
2 stops20h 27mAmerican Airlines
Deal found 10/13$598
This Delta deal was found by Cheapflights users on 10/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/287:05 amONT - DUB
1 stop16h 40mDelta
Thu 12/45:55 amDUB - ONT
2 stops19h 13mDelta
Deal found 10/13$600
This United Airlines deal was found by Cheapflights users on 10/14. 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.
Wed 10/297:00 amONT - DUB
1 stop18h 10mUnited Airlines
Mon 11/310:40 amDUB - ONT
1 stop15h 56mUnited Airlines
Deal found 10/14$602
This Iberia deal was found by Cheapflights users on 10/13. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2810:47 amONT - DUB
2 stops19h 33mMultiple Airlines
Thu 12/41:10 pmDUB - ONT
2 stops18h 45mMultiple Airlines
Deal found 10/13$603
This British Airways deal was found by Cheapflights users on 10/13. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/208:15 amONT - DUB
2 stops17h 25mBritish Airways
Wed 11/58:50 amDUB - ONT
2 stops21h 39mBritish Airways
Deal found 10/13$605
This United Airlines deal was found by Cheapflights users on 10/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/139:36 amONT - SNN
2 stops16h 39mUnited Airlines
Mon 10/2012:30 pmSNN - ONT
2 stops18h 22mUnited Airlines
Deal found 10/13$752
This Priceline deal was found by Cheapflights users on 10/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/712:46 pmONT - SNN
2 stops18h 59mBritish Airways
Tue 11/117:50 amSNN - ONT
2 stops22h 39mBritish Airways
Deal found 10/14$1,349
This Cheapflightsfares deal was found by Cheapflights users on 10/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/212:59 pmONT - ORK
2 stops16h 26mBritish Airways
Sun 11/3011:55 amORK - ONT
2 stops18h 28mBritish Airways
Deal found 10/13$3,867

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 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$524
(United Airlines)

One-way from

$423
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$651
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 ($179 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
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 October 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 12/3

7:05 am-7:45 am

1 stop16h 40m

Dublin

Wed 12/10

5:55 am-5:07 pm

2 stops19h 12m

$551

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 12/3

7:05 am-7:45 am

1 stop16h 40m

Dublin

Thu 12/11

5:55 am-10:47 pm

2 stops24h 52m

$551

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

7:00 am-8:10 am

1 stop18h 10m

Dublin

Thu 11/6

10:40 am-10:31 pm

1 stop19h 51m

$552

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

7:00 am-8:10 am

1 stop18h 10m

Dublin

Mon 11/3

10:40 am-6:36 pm

1 stop15h 56m

$602

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 12/5

7:05 am-7:45 am

1 stop16h 40m

Dublin

Wed 12/10

9:45 am-11:04 pm

1 stop21h 19m

$602

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 2/1

6:00 am-7:30 am

2 stops17h 30m

Dublin

Mon 2/16

9:30 am-9:19 pm

2 stops19h 49m

$607

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 12/27

11:59 pm-8:10 am

1 stop24h 11m

Dublin

Sat 1/10

10:40 am-8:58 pm

2 stops18h 18m

$613

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 1/9

10:58 am-3:45 pm

2 stops20h 47m

Shannon

Sat 1/17

7:50 am-10:49 pm

2 stops22h 59m

$634

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 12/30

11:59 pm-8:10 am

1 stop24h 11m

Dublin

Fri 1/9

10:40 am-10:53 pm

2 stops20h 13m

$646

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 10/14

Showing 1-10 of 29 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 14, 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 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
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

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
8.0
Very good
7,972 reviews
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

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
11,040 reviews
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

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
2,988 reviews
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

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 Delta, United Airlines, and American Airlines fly from Ontario to Ireland in about 16h 40m. The time it takes to get you to your destination can typically vary by up to 4h 07m. 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 - 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, 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.

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 October 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$786FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$623Average$975FlexibilityNo cancel feeOn-time71%

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