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$470+ 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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$728
(United Airlines)

One-way from

$470
(KLM)

Popular in

June

Cheapest in

January

Average price

$600
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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. 22% potential increase in price ($209 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 28, 2025.

This Finnair deal was found by Cheapflights users on 3/27. 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.
Tue 10/2810:55 amONT - DUB
1 stop13h 20mMultiple Airlines
Mon 11/32:05 pmDUB - ONT
1 stop15h 55mMultiple Airlines
Deal found 3/27$600
This Delta deal was found by Cheapflights users on 3/26. 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 10/1810:59 pmONT - DUB
1 stop25h 46mDelta
Wed 11/129:45 amDUB - ONT
1 stop17h 44mDelta
Deal found 3/26$605
This United Airlines deal was found by Cheapflights users on 3/27. 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 stops20h 05mUnited Airlines
Mon 11/311:50 amDUB - ONT
2 stops16h 27mUnited Airlines
Deal found 3/27$614
This Iberia deal was found by Cheapflights users on 3/26. 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 10/1712:51 pmONT - DUB
1 stop12h 54mIberia
Sun 11/92:05 pmDUB - ONT
1 stop17h 40mIberia
Deal found 3/26$621
This United Airlines deal was found by Cheapflights users on 3/27. 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 5/66:08 amONT - SNN
2 stops20h 07mUnited Airlines
Thu 5/1512:30 pmSNN - ONT
2 stops17h 30mUnited Airlines
Deal found 3/27$728
This KLM deal was found by Cheapflights users on 3/26. 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.
Thu 10/167:00 amONT - DUB
1 stop17h 45mKLM
Mon 11/109:45 amDUB - ONT
1 stop20h 44mKLM
Deal found 3/26$821
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Tue 4/14:30 pmONT - DUB
2 stops16h 45mAmerican Airlines
Tue 4/812:40 pmDUB - ONT
1 stop19h 10mAmerican Airlines
Deal found 3/27$824
This Justfly.com deal was found by Cheapflights users on 3/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/21:36 pmONT - DUB
2 stops34h 09mAir Canada
Tue 6/109:20 amDUB - ONT
2 stops34h 54mAir Canada
Deal found 3/27$879
This American Airlines deal was found by Cheapflights users on 3/26. 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.
Tue 9/210:28 amONT - ORK
2 stops25h 22mMultiple Airlines
Sun 12/2111:50 amORK - ONT
2 stops18h 13mMultiple Airlines
Deal found 3/26$952
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Sun 4/134:35 pmONT - ORK
2 stops19h 15mAmerican Airlines
Thu 4/177:20 amORK - ONT
2 stops22h 38mAmerican Airlines
Deal found 3/27$1,151
This KLM deal was found by Cheapflights users on 3/27. 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.
Sat 6/287:00 amONT - SNN
2 stops20h 10mKLM
Sun 7/61:05 pmSNN - ONT
2 stops17h 24mKLM
Deal found 3/27$16,353

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 March 28, 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

Tue 5/6

6:08 am-10:15 am

2 stops20h 07m

Shannon

Thu 5/15

12:30 pm-10:00 pm

2 stops17h 30m

$728

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 5/19

6:00 am-10:20 am

2 stops20h 20m

Dublin

Mon 6/9

9:20 am-10:26 pm

2 stops45h 06m

$766

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/14

12:07 pm-8:45 am

1 stop12h 38m

Dublin

Mon 4/21

11:00 am-10:57 am

1 stop31h 57m

$787

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 9/16

11:39 am-11:05 am

2 stops15h 26m

Dublin

Wed 10/1

12:15 pm-11:59 pm

2 stops19h 44m

$792

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Thu 4/17

10:54 am-9:45 am

1 stop14h 51m

Dublin

Tue 4/22

12:40 pm-10:10 pm

1 stop17h 30m

$795

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/7

7:00 am-8:45 am

1 stop17h 45m

Dublin

Wed 4/23

11:00 am-7:28 pm

1 stop16h 28m

$864

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 6/2

1:36 pm-7:45 am

2 stops34h 09m

Dublin

Tue 6/10

9:20 am-12:14 pm

2 stops34h 54m

$879

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/7

12:50 pm-9:45 am

1 stop12h 55m

Dublin

Wed 4/23

12:40 pm-6:29 pm

1 stop13h 49m

$904

OntarioCork

ONT - ORK

ONTORK

Ontario

Tue 9/2

10:28 am-7:50 pm

2 stops25h 22m

Cork

Sun 12/21

11:50 am-10:03 pm

2 stops18h 13m

$952

OntarioCork

ONT - ORK

ONTORK

Ontario

Sun 4/13

4:35 pm-7:50 pm

2 stops19h 15m

Cork

Thu 4/17

7:20 am-9:58 pm

2 stops22h 38m

$1,151

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/28

Showing 1-10 of 20 results
1
2

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 $1,010). 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 March 28, 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.

Rainfall in Ireland by month

Plan your trip to Ireland by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ireland ranges from 1.9 - 3.1 inches per month. October is typically the wettest month, when rainfall can reach 3.1 in. February is typically the driest time to visit Ireland when rainfall is around 1.9 in.

Temperature in Ireland by month

Plan your trip to Ireland by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ireland, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

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 March 28, 2025.
See what other customers who have flown with Delta, KLM and United Airlines from Ontario to Ireland have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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.
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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.
United Airlines
7.4
Good
8,603 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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.
WestJet
7.2
Good
2,785 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

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 cheapest airlines to fly from Ontario to Ireland one-way?

    The cheapest airline one-way is KLM, with whom users have recently found tickets for as low as $470. However, be on the lookout for offers from United Airlines and Iberia, 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, 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 $1,010). 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 5 airlines flying from Ontario to Ireland

Discover the top 5 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$507Average$627FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$557Average$989FlexibilityNo cancel feeOn-time71%
IberiaCheapest$580Average$808FlexibilityNo cancel feeOn-time77%
KLMCheapest$607Average$893FlexibilityNo cancel feeOn-time75%
DeltaCheapest$677Average$861FlexibilityNo cancel feeOn-timeN/A
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