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Ireland

$427+ 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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
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 November 6, 2025.

This KLM deal was found by Cheapflights users on 11/5. 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.
Sun 11/910:25 pmONT - DUB
1 stop25h 20mKLM
Tue 11/258:50 amDUB - ONT
2 stops22h 14mKLM
Deal found 11/5$540
This United Airlines deal was found by Cheapflights users on 11/4. 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 11/97:00 amONT - DUB
1 stop17h 10mUnited Airlines
Tue 11/2510:40 amDUB - ONT
1 stop19h 51mUnited Airlines
Deal found 11/4$543
This Delta deal was found by Cheapflights users on 11/5. 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.
Mon 11/247:05 amONT - DUB
1 stop16h 40mDelta
Wed 12/35:55 amDUB - ONT
2 stops19h 13mDelta
Deal found 11/5$550
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Tue 11/187:00 amONT - DUB
1 stop17h 10mUnited Airlines
Tue 11/2510:40 amDUB - ONT
1 stop19h 51mUnited Airlines
Deal found 11/6$552
This Air Canada deal was found by Cheapflights users on 11/6. 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.
Tue 11/186:00 amONT - DUB
2 stops17h 10mAir Canada
Wed 11/269:00 amDUB - ONT
2 stops19h 44mAir Canada
Deal found 11/6$554
This Delta deal was found by Cheapflights users on 11/6. 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 11/187:05 amONT - DUB
2 stops18h 15mDelta
Tue 11/255:55 amDUB - ONT
2 stops19h 14mDelta
Deal found 11/6$555
This Delta deal was found by Cheapflights users on 11/5. 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 11/2310:25 pmONT - DUB
1 stop25h 20mDelta
Wed 12/35:55 amDUB - ONT
2 stops19h 13mDelta
Deal found 11/5$556
This United Airlines deal was found by Cheapflights users on 11/5. 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 12/316:00 amONT - DUB
2 stops18h 10mUnited Airlines
Fri 1/910:40 amDUB - ONT
2 stops19h 18mUnited Airlines
Deal found 11/5$557
This United Airlines deal was found by Cheapflights users on 11/4. 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 11/197:00 amONT - DUB
1 stop17h 10mUnited Airlines
Wed 12/310:40 amDUB - ONT
2 stops20h 09mUnited Airlines
Deal found 11/4$577
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Tue 11/187:00 amONT - DUB
1 stop17h 10mUnited Airlines
Sun 11/2312:05 pmDUB - ONT
2 stops18h 46mUnited Airlines
Deal found 11/6$602
This British Airways deal was found by Cheapflights users on 11/4. 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.
Tue 12/910:47 amONT - SNN
2 stops16h 43mBritish Airways
Mon 12/157:50 amSNN - ONT
2 stops22h 38mBritish Airways
Deal found 11/4$686
This British Airways deal was found by Cheapflights users on 11/5. 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 11/104:47 pmONT - SNN
2 stops15h 58mBritish Airways
Tue 11/257:50 amSNN - ONT
2 stops22h 33mBritish Airways
Deal found 11/5$745

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 November 6, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$543
(United Airlines)

One-way from

$427
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$636
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. 20% potential increase in price ($182 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 6, 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

Mon 12/1

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/17

10:40 am-10:49 pm

2 stops20h 09m

$543

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/24

7:05 am-7:45 am

1 stop16h 40m

Dublin

Wed 12/3

5:55 am-5:08 pm

2 stops19h 13m

$550

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/18

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 11/26

10:40 am-10:31 pm

1 stop19h 51m

$552

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 11/23

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/3

10:40 am-10:49 pm

2 stops20h 09m

$552

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/25

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/3

10:40 am-10:49 pm

2 stops20h 09m

$552

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 2/7

10:30 pm-8:45 am

2 stops26h 15m

Dublin

Tue 2/17

5:55 am-10:40 pm

2 stops24h 45m

$555

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 12/31

7:05 am-7:45 am

1 stop16h 40m

Dublin

Tue 1/13

10:45 am-9:07 pm

2 stops18h 22m

$557

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 12/31

6:00 am-8:10 am

2 stops18h 10m

Dublin

Fri 1/9

10:40 am-9:58 pm

2 stops19h 18m

$557

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/19

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/3

10:40 am-10:49 pm

2 stops20h 09m

$577

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 11/16

7:05 am-7:45 am

1 stop16h 40m

Dublin

Sun 11/23

9:45 am-7:42 pm

1 stop17h 57m

$602

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 32 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 November 6, 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 November 6, 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
8,001 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
8,001 reviews
Delta
7.9
Good
8,001 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
7.9
Good
8,001 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
3,007 reviews
Delta
7.9
Good
8,001 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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 British Airways 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 30m. 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 November 6, 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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