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$399+ 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 8/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Jul 7 — Jul 141
Mon 7/7
Mon 7/14
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 July 2, 2025.

Round-trip from

$478
(United Airlines)

One-way from

$399
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$910
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. 21% potential increase in price ($193 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 2, 2025.

This United Airlines deal was found by Cheapflights users on 7/2. 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 10/267:00 amONT - DUB
1 stop18h 10mUnited Airlines
Wed 11/59:00 amDUB - ONT
2 stops21h 31mUnited Airlines
Deal found 7/2$478
This Delta deal was found by Cheapflights users on 7/1. 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 8/411:40 amONT - DUB
1 stop13h 05mDelta
Wed 8/2011:00 amDUB - ONT
1 stop16h 11mDelta
Deal found 7/1$480
This Iberia deal was found by Cheapflights users on 7/1. 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 8/38:15 amONT - DUB
1 stop17h 30mIberia
Tue 8/1912:40 pmDUB - ONT
1 stop18h 08mIberia
Deal found 7/1$489
This American Airlines deal was found by Cheapflights users on 7/1. 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 10/2910:57 amONT - DUB
2 stops16h 18mAmerican Airlines
Thu 11/610:00 amDUB - ONT
2 stops19h 41mAmerican Airlines
Deal found 7/1$497
This KLM deal was found by Cheapflights users on 7/1. 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 11/107:00 amONT - DUB
1 stop16h 45mKLM
Mon 11/179:45 amDUB - ONT
1 stop20h 56mKLM
Deal found 7/1$533
This Finnair deal was found by Cheapflights users on 7/1. 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.
Wed 10/2911:59 pmONT - DUB
1 stop24h 16mMultiple Airlines
Thu 11/611:30 amDUB - ONT
2 stops18h 11mMultiple Airlines
Deal found 7/1$544
This United Airlines deal was found by Cheapflights users on 7/1. 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 7/227:00 amONT - SNN
1 stop16h 30mUnited Airlines
Wed 7/309:30 amSNN - ONT
1 stop20h 36mUnited Airlines
Deal found 7/1$552
This Air Canada deal was found by Cheapflights users on 7/2. 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.
Mon 9/16:38 pmONT - DUB
2 stops29h 37mAir Canada
Sun 9/79:20 amDUB - ONT
2 stops43h 13mAir Canada
Deal found 7/2$585
This KAYAK deal was found by Cheapflights users on 7/1. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/112:51 pmONT - ORK
2 stops16h 24mBritish Airways
Mon 10/2011:45 amORK - ONT
2 stops18h 33mBritish Airways
Deal found 7/1$888
This American Airlines deal was found by Cheapflights users on 7/2. 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 9/254:45 pmONT - ORK
2 stops19h 05mMultiple Airlines
Mon 9/2911:45 amORK - ONT
2 stops18h 03mMultiple Airlines
Deal found 7/2$1,147
This Priceline deal was found by Cheapflights users on 7/1. 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.
Wed 7/24:50 pmONT - SNN
2 stops15h 20mBritish Airways
Wed 7/97:40 amSNN - ONT
2 stops18h 28mBritish Airways
Deal found 7/1$2,234
This Gurufare deal was found by Cheapflights users on 7/1. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1310:56 pmONT - SNN
1 stop22h 59mJetBlue
Sat 10/252:40 pmSNN - ONT
1 stop14h 49mJetBlue
Deal found 7/1$2,802

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 July 2, 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 10/26

7:00 am-8:10 am

1 stop18h 10m

Dublin

Wed 11/5

9:00 am-10:31 pm

2 stops21h 31m

$478

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 8/4

11:40 am-8:45 am

1 stop13h 05m

Dublin

Wed 8/20

11:00 am-7:11 pm

1 stop16h 11m

$480

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 8/3

8:15 am-9:45 am

1 stop17h 30m

Dublin

Tue 8/19

12:40 pm-10:48 pm

1 stop18h 08m

$489

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

10:57 am-10:15 am

2 stops16h 18m

Dublin

Thu 11/6

10:00 am-9:41 pm

2 stops19h 41m

$497

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/10

7:00 am-7:45 am

1 stop16h 45m

Dublin

Mon 11/17

9:45 am-10:41 pm

1 stop20h 56m

$533

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

11:59 pm-7:15 am

1 stop24h 16m

Dublin

Thu 11/6

11:30 am-9:41 pm

2 stops18h 11m

$544

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 7/22

7:00 am-7:30 am

1 stop16h 30m

Shannon

Wed 7/30

9:30 am-10:06 pm

1 stop20h 36m

$552

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 9/1

6:38 pm-8:15 am

2 stops29h 37m

Dublin

Sun 9/7

9:20 am-8:33 pm

2 stops43h 13m

$585

OntarioCork

ONT - ORK

ONTORK

Ontario

Sat 10/11

2:51 pm-3:15 pm

2 stops16h 24m

Cork

Mon 10/20

11:45 am-10:18 pm

2 stops18h 33m

$888

OntarioCork

ONT - ORK

ONTORK

Ontario

Thu 9/25

4:45 pm-7:50 pm

2 stops19h 05m

Cork

Mon 9/29

11:45 am-9:48 pm

2 stops18h 03m

$1,147

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 24 results
1
2
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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 $929). 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 July 2, 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 July 2, 2025.
Read through reviews of airlines operating flights from Ontario to Ireland, such as Delta, KLM, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

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
7,983 reviews
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

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
1,366 reviews
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

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
8,861 reviews
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

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.
JetBlue
7.3
Good
2,918 reviews
Delta
8.0
Very good
7,983 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

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
7,983 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

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 United Airlines, with whom users have recently found tickets for as low as $399. However, be on the lookout for offers from KLM 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 $929). 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 July 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$851FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$786FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$596Average$956FlexibilityNo cancel feeOn-time71%

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