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$425+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Cheap 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 December 9, 2025.

This United Airlines deal was found by Cheapflights users on 12/8. 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 12/2411:59 pmONT - DUB
1 stop24h 11mUnited Airlines
Thu 1/89:30 amDUB - ONT
2 stops19h 28mUnited Airlines
Deal found 12/8$679
This United Airlines deal was found by Cheapflights users on 12/8. 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 12/156:41 pmONT - DUB
3 stops28h 49mUnited Airlines
Thu 1/89:30 amDUB - ONT
3 stops33h 48mUnited Airlines
Deal found 12/8$989
This KLM deal was found by Cheapflights users on 12/7. 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 12/147:05 amONT - DUB
1 stop16h 40mKLM
Wed 12/179:45 amDUB - ONT
1 stop17h 54mKLM
Deal found 12/7$1,039
This United Airlines deal was found by Cheapflights users on 12/8. 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 12/156:00 amONT - DUB
2 stops17h 30mUnited Airlines
Wed 1/710:40 amDUB - ONT
2 stops18h 18mUnited Airlines
Deal found 12/8$1,123
This American Airlines deal was found by Cheapflights users on 12/8. 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 12/1410:47 amONT - DUB
1 stop12h 23mAmerican Airlines
Thu 1/81:15 pmDUB - ONT
2 stops28h 53mAmerican Airlines
Deal found 12/8$1,189
This American Airlines deal was found by Cheapflights users on 12/8. 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 12/1312:44 pmONT - DUB
1 stop34h 26mAmerican Airlines
Thu 1/81:15 pmDUB - ONT
2 stops28h 53mAmerican Airlines
Deal found 12/8$1,199
This American Airlines deal was found by Cheapflights users on 12/8. 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 12/147:03 amONT - DUB
2 stops17h 37mAmerican Airlines
Wed 1/72:20 pmDUB - ONT
2 stops36h 00mAmerican Airlines
Deal found 12/8$1,207
This United Airlines deal was found by Cheapflights users on 12/8. 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.
Thu 12/115:05 amONT - DUB
2 stops19h 05mUnited Airlines
Thu 1/810:40 amDUB - ONT
2 stops18h 18mUnited Airlines
Deal found 12/8$1,213
This American Airlines deal was found by Cheapflights users on 12/8. 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 12/133:04 pmONT - DUB
1 stop32h 06mAmerican Airlines
Wed 1/72:20 pmDUB - ONT
2 stops36h 00mAmerican Airlines
Deal found 12/8$1,217
This Finnair deal was found by Cheapflights users on 12/6. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:50 amONT - DUB
1 stop12h 25mMultiple Airlines
Mon 12/2912:55 pmDUB - ONT
1 stop17h 19mMultiple Airlines
Deal found 12/6$1,233
This Delta deal was found by Cheapflights users on 12/8. 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 12/131:29 pmONT - DUB
2 stops35h 51mDelta
Thu 1/810:45 amDUB - ONT
2 stops18h 20mDelta
Deal found 12/8$1,261
This KLM deal was found by Cheapflights users on 12/8. 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 12/147:05 amONT - DUB
1 stop16h 40mKLM
Tue 1/65:15 pmDUB - ONT
2 stops30h 57mKLM
Deal found 12/8$1,334

Find flight deals from Ontario to Ireland

Keep the following information in mind while searching for Ontario to Ireland flight deals. Data was last updated December 9, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$569
(United Airlines)

One-way from

$425
(Priceline)

Popular in

June

Cheapest in

January

Average price

$812
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 ($183 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 December 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 December 9, 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

Wed 4/15

7:00 am-10:15 am

2 stops19h 15m

Shannon

Wed 4/22

12:30 pm-11:06 pm

2 stops18h 36m

$569

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 12/24

11:59 pm-8:10 am

1 stop24h 11m

Dublin

Thu 1/8

9:30 am-8:58 pm

2 stops19h 28m

$679

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 1/22

4:45 pm-4:45 pm

2 stops16h 00m

Shannon

Tue 2/3

7:50 am-10:48 pm

2 stops22h 58m

$686

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 1/29

4:45 pm-11:30 am

2 stops34h 45m

Shannon

Mon 2/2

5:30 pm-6:45 pm

2 stops33h 15m

$686

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Thu 4/16

7:00 am-8:45 am

1 stop17h 45m

Dublin

Tue 4/21

11:00 am-6:15 pm

1 stop15h 15m

$690

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 4/15

12:55 pm-9:45 am

1 stop12h 50m

Dublin

Sat 4/25

1:45 pm-9:56 pm

1 stop16h 11m

$690

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 4/14

12:55 pm-9:45 am

1 stop12h 50m

Dublin

Sun 4/19

1:45 pm-9:56 pm

1 stop16h 11m

$690

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 4/12

12:55 pm-9:45 am

1 stop12h 50m

Dublin

Sun 4/19

12:40 pm-8:18 pm

1 stop15h 38m

$690

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 1/30

6:00 am-7:30 am

2 stops17h 30m

Dublin

Tue 2/3

9:30 am-8:58 pm

2 stops19h 28m

$690

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 1/9

6:00 am-7:30 am

2 stops17h 30m

Dublin

Fri 5/8

11:35 am-10:52 pm

2 stops19h 17m

$694

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/8

Showing 1-10 of 56 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, November is the cheapest month in which you can book a flight from Ontario to Ireland (average of $455). 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 December 9, 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 25% 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 December 9, 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
8,009 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Crew

8.5

Overall

7.9

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
7.9
Good
8,009 reviews
Delta
7.9
Good
8,009 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Crew

8.5

Overall

7.9

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
11,043 reviews
Delta
7.9
Good
8,009 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Crew

8.5

Overall

7.9

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.
Iberia
7.0
Good
3,043 reviews
Delta
7.9
Good
8,009 reviews

Food

7.3

Entertainment

7.9

Boarding

8.1

Crew

8.5

Overall

7.9

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.

  • How long is the flight from Ontario to Ireland?

    Airlines like United Airlines, British Airways, and KLM fly from Ontario to Ireland in about 16h. The time it takes to get you to your destination can typically vary by up to 3h 15m. There are 5072 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 - 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 $455). 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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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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$891FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$677Average$932FlexibilityNo cancel feeOn-time71%

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