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Ireland

$230+ 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Mar 9 — Mar 161
Mon 3/9
Mon 3/16
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 February 7, 2026.

This United Airlines deal was found by Cheapflights users on 2/4. 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 4/226:05 am
ONT
-
SNN
2 stops20h 10m
United Airlines
Thu 4/3012:30 pm
SNN
-
ONT
2 stops18h 00m
United Airlines
Deal found 2/4$493
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Wed 7/227:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Fri 7/319:30 am
SNN
-
ONT
1 stop20h 58m
United Airlines
Deal found 2/6$565
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Thu 7/237:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Fri 7/319:30 am
SNN
-
ONT
1 stop20h 58m
United Airlines
Deal found 2/6$603
This United Airlines deal was found by Cheapflights users on 2/4. 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.
Thu 4/237:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Fri 5/112:30 pm
SNN
-
ONT
2 stops17h 28m
United Airlines
Deal found 2/4$611
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Wed 7/227:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Sat 8/19:30 am
SNN
-
ONT
1 stop20h 58m
United Airlines
Deal found 2/6$625
This United Airlines deal was found by Cheapflights users on 2/3. 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 10/287:00 am
ONT
-
DUB
1 stop18h 10m
United Airlines
Wed 11/119:00 am
DUB
-
ONT
2 stops44h 21m
United Airlines
Deal found 2/3$628
This Air Canada deal was found by Cheapflights users on 2/7. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:30 pm
ONT
-
DUB
2 stops29h 15m
Air Canada
Tue 8/259:50 am
DUB
-
ONT
2 stops39h 28m
Air Canada
Deal found 2/7$632
This United Airlines deal was found by Cheapflights users on 2/5. 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 4/16:05 am
ONT
-
DUB
2 stops20h 35m
United Airlines
Wed 4/159:50 am
DUB
-
ONT
2 stops44h 36m
United Airlines
Deal found 2/5$638
This oojo deal was found by Cheapflights users on 2/5. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:57 am
ONT
-
DUB
2 stops19h 38m
British Airways
Tue 11/38:50 am
DUB
-
ONT
2 stops21h 33m
British Airways
Deal found 2/5$639
This Iberia deal was found by Cheapflights users on 2/5. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:57 am
ONT
-
DUB
2 stops19h 38m
Multiple Airlines
Tue 11/31:00 pm
DUB
-
ONT
1 stop17h 23m
Multiple Airlines
Deal found 2/5$647
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Wed 3/48:00 am
ONT
-
DUB
2 stops17h 55m
United Airlines
Tue 3/1010:40 am
DUB
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/6$654
This United Airlines deal was found by Cheapflights users on 2/5. 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.
Tue 10/207:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 11/310:40 am
DUB
-
ONT
1 stop19h 46m
United Airlines
Deal found 2/5$655

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 February 7, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$493
(United Airlines)

One-way from

$230
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$590
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 ($178 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 7, 2026.
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 4/22

6:05 am-10:15 am

2 stops20h 10m

Shannon

Thu 4/30

12:30 pm-10:30 pm

2 stops18h 00m

$493

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 7/23

7:00 am-7:30 am

1 stop16h 30m

Shannon

Fri 7/31

9:30 am-10:28 pm

1 stop20h 58m

$603

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 4/23

7:00 am-10:15 am

2 stops19h 15m

Shannon

Fri 5/1

12:30 pm-9:58 pm

2 stops17h 28m

$611

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Wed 7/22

7:00 am-7:30 am

1 stop16h 30m

Shannon

Sat 8/1

9:30 am-10:28 pm

1 stop20h 58m

$625

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 3/11

6:15 am-7:30 am

2 stops18h 15m

Dublin

Tue 3/17

10:40 am-10:18 pm

1 stop18h 38m

$658

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 4/19

7:05 am-8:45 am

1 stop17h 40m

Dublin

Wed 4/29

11:00 am-6:33 pm

1 stop15h 33m

$660

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 4/1

6:05 am-10:40 am

2 stops20h 35m

Dublin

Wed 4/15

11:35 am-10:26 pm

1 stop18h 51m

$665

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Tue 4/28

9:50 am-5:47 pm

3 stops39h 57m

$666

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Tue 5/12

9:50 am-8:36 pm

2 stops42h 46m

$666

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 7/23

6:00 am-7:30 am

2 stops17h 30m

Shannon

Sat 8/1

9:30 am-10:28 pm

1 stop20h 58m

$667

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/6

Showing 1-10 of 41 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 $454). Flying from Ontario to Ireland in June is currently the most expensive (average of $753). 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.

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 February 7, 2026.
Read through reviews of airlines operating flights from Ontario to Ireland, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,248 reviews

Comfort

7.2

Entertainment

6.9

Food

6.4

Boarding

7.5

Crew

8.0

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.
American Airlines
7.2
Good
11,248 reviews
American Airlines
7.2
Good
11,248 reviews

Comfort

7.2

Entertainment

6.9

Food

6.4

Boarding

7.5

Crew

8.0

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.

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 17h 02m. The time it takes to get you to your destination can typically vary by up to 3h 08m. There are 5121 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 $454). Flying from Ontario to Ireland in June is currently the most expensive (average of $753). 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 airline flying from Ontario to Ireland

Discover the top airline 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 February 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$890FlexibilityNo cancel feeOn-time71%

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