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Ireland

$393+ 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 7/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Apr 29 — May 61
Wed 4/29
Wed 5/6
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 March 30, 2026.

This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/167:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Thu 9/39:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/26$731
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:13 pm
ONT
-
SNN
2 stops28h 17m
United Airlines
Tue 9/112:30 pm
SNN
-
ONT
2 stops17h 29m
United Airlines
Deal found 3/26$736
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:13 pm
ONT
-
SNN
2 stops28h 17m
United Airlines
Fri 9/49:30 am
SNN
-
ONT
2 stops35h 08m
United Airlines
Deal found 3/26$747
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Thu 9/39:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/26$769
This United Airlines deal was found by Cheapflights users on 3/29. 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.
Fri 8/215:45 am
ONT
-
SNN
2 stops20h 30m
United Airlines
Tue 8/259:30 am
SNN
-
ONT
2 stops21h 28m
United Airlines
Deal found 3/29$774
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.
Fri 8/2110:59 pm
ONT
-
SNN
2 stops52h 11m
Delta
Tue 9/11:05 pm
SNN
-
ONT
2 stops29h 59m
Delta
Deal found 3/26$775
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.
Fri 8/2110:59 pm
ONT
-
SNN
2 stops52h 11m
Delta
Thu 9/31:05 pm
SNN
-
ONT
2 stops36h 56m
Delta
Deal found 3/26$780
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 8/46:30 am
ONT
-
SNN
1 stop17h 00m
United Airlines
Wed 8/129:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/27$784
This United Airlines deal was found by Cheapflights users on 3/25. 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 5/57:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Mon 5/1112:30 pm
SNN
-
ONT
2 stops17h 28m
United Airlines
Deal found 3/25$801
This Icelandair deal was found by Cheapflights users on 3/25. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1410:33 am
ONT
-
DUB
2 stops16h 32m
Multiple Airlines
Tue 4/282:15 pm
DUB
-
ONT
2 stops16h 17m
Multiple Airlines
Deal found 3/25$801
This Icelandair deal was found by Cheapflights users on 3/25. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1910:33 am
ONT
-
DUB
2 stops18h 42m
Multiple Airlines
Tue 5/52:15 pm
DUB
-
ONT
2 stops16h 17m
Multiple Airlines
Deal found 3/25$802
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Sun 8/309:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/26$807

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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$731
(United Airlines)

One-way from

$393
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$714
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 ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 30, 2026.
Use the filters below to find and compare flights from Ontario to Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 8/16

5:00 am-7:30 am

2 stops18h 30m

Shannon

Thu 9/3

12:30 pm-10:58 pm

2 stops18h 28m

$736

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 8/16

5:00 am-7:30 am

2 stops18h 30m

Shannon

Fri 9/4

9:30 am-6:19 pm

1 stop16h 49m

$736

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 8/17

5:00 am-7:30 am

2 stops18h 30m

Shannon

Tue 9/1

9:30 am-8:52 pm

2 stops19h 22m

$736

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Wed 8/19

5:00 am-7:30 am

2 stops18h 30m

Shannon

Fri 9/4

9:30 am-6:19 pm

1 stop16h 49m

$736

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 8/21

5:45 am-10:15 am

2 stops20h 30m

Shannon

Tue 8/25

9:30 am-10:58 pm

2 stops21h 28m

$774

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 8/20

5:00 am-7:30 am

2 stops18h 30m

Shannon

Wed 9/2

12:30 pm-9:59 pm

2 stops17h 29m

$774
Quickest round-trip

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 8/30

8:00 am-7:30 am

2 stops15h 30m

Shannon

Fri 9/4

9:30 am-6:19 pm

1 stop16h 49m

$789

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 4/19

10:33 am-1:15 pm

2 stops18h 42m

Dublin

Tue 5/5

2:15 pm-10:32 pm

2 stops16h 17m

$802

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 8/15

7:00 am-7:30 am

1 stop16h 30m

Shannon

Sat 8/29

9:30 am-6:19 pm

1 stop16h 49m

$807

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/20

10:33 am-1:15 pm

2 stops18h 42m

Dublin

Wed 5/6

12:15 pm-10:32 pm

2 stops18h 17m

$811

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 42 resultsSorted by cheapest first
1
2
3
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5

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 $436). Flying from Ontario to Ireland in June is currently the most expensive (average of $728). 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 March 30, 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
7.1
Good
11,530 reviews

Food

6.4

Comfort

7.2

Crew

7.9

Entertainment

6.9

Overall

7.1

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes
American Airlines
7.1
Good
11,530 reviews
American Airlines
7.1
Good
11,530 reviews

Food

6.4

Comfort

7.2

Crew

7.9

Entertainment

6.9

Overall

7.1

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes

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, KLM, and British Airways fly from Ontario to Ireland in about 16h 30m. The time it takes to get you to your destination can typically vary by up to 10h 16m. 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, January is the cheapest month in which you can book a flight from Ontario to Ireland (average of $436). Flying from Ontario to Ireland in June is currently the most expensive (average of $728). 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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$890FlexibilityNo cancel feeOn-time71%

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