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Ireland

$311+ 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 7/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Apr 5 — Apr 121
Sun 4/5
Sun 4/12
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 6, 2026.

This United Airlines deal was found by Cheapflights users on 3/2. 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 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 3/2$532
This United Airlines deal was found by Cheapflights users on 3/2. 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.
Sat 8/157:13 pm
ONT
-
SNN
2 stops28h 17m
United Airlines
Tue 9/19:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/2$536
This United Airlines deal was found by Cheapflights users on 3/2. 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 8/167:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Sat 8/299:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/2$570
This United Airlines deal was found by Cheapflights users on 3/2. 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.
Fri 8/215:45 am
ONT
-
SNN
2 stops20h 30m
United Airlines
Wed 9/212:30 pm
SNN
-
ONT
2 stops17h 29m
United Airlines
Deal found 3/2$574
This United Airlines deal was found by Cheapflights users on 3/1. 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.
Wed 4/156:05 am
ONT
-
SNN
2 stops20h 10m
United Airlines
Wed 4/2212:30 pm
SNN
-
ONT
2 stops16h 06m
United Airlines
Deal found 3/1$601
This United Airlines deal was found by Cheapflights users on 3/2. 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.
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 3/2$608
This United Airlines deal was found by Cheapflights users on 3/2. 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.
Thu 8/207:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Fri 9/49:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 3/2$638
This United Airlines deal was found by Cheapflights users on 3/3. 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.
Tue 4/286:05 am
ONT
-
SNN
2 stops20h 10m
United Airlines
Tue 5/1212:30 pm
SNN
-
ONT
2 stops18h 05m
United Airlines
Deal found 3/3$640
This FlightHub deal was found by Cheapflights users on 3/2. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/177:13 pm
ONT
-
DUB
2 stops28h 32m
Air Canada
Wed 9/29:50 am
DUB
-
ONT
2 stops34h 22m
Air Canada
Deal found 3/2$645
This United Airlines deal was found by Cheapflights users on 3/2. 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.
Tue 8/187:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 9/19:50 am
DUB
-
ONT
2 stops40h 29m
United Airlines
Deal found 3/2$648
This United Airlines deal was found by Cheapflights users on 3/3. 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.
Sat 4/257:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Sat 5/912:30 pm
SNN
-
ONT
2 stops17h 28m
United Airlines
Deal found 3/3$649
This FlightHub deal was found by Cheapflights users on 3/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/811:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Wed 9/1611:40 am
DUB
-
ONT
1 stop17h 49m
JetBlue
Deal found 3/1$649

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 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$532
(United Airlines)

One-way from

$311
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$673
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. 18% potential increase in price ($172 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 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 6, 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

Mon 8/17

7:00 am-7:30 am

1 stop16h 30m

Shannon

Wed 9/2

9:30 am-6:19 pm

1 stop16h 49m

$532

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 8/16

7:00 am-7:30 am

1 stop16h 30m

Shannon

Fri 9/4

9:30 am-6:19 pm

1 stop16h 49m

$532

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 8/15

7:13 pm-7:30 am

2 stops28h 17m

Shannon

Wed 9/2

9:30 am-6:19 pm

1 stop16h 49m

$536

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 8/15

7:13 pm-7:30 am

2 stops28h 17m

Shannon

Sun 8/30

9:30 am-6:19 pm

1 stop16h 49m

$574

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 8/15

7:13 pm-7:30 am

2 stops28h 17m

Shannon

Sat 8/29

9:30 am-6:19 pm

1 stop16h 49m

$574

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 8/18

7:00 am-7:30 am

1 stop16h 30m

Shannon

Mon 8/31

12:30 pm-10:58 pm

2 stops18h 28m

$574

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Wed 4/15

6:05 am-10:15 am

2 stops20h 10m

Shannon

Wed 4/22

12:30 pm-8:36 pm

2 stops16h 06m

$601

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 4/28

6:05 am-10:15 am

2 stops20h 10m

Shannon

Tue 5/12

12:30 pm-10:35 pm

2 stops18h 05m

$640

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 4/6

7:00 am-9:45 am

1 stop18h 45m

Dublin

Fri 4/17

11:35 am-10:31 pm

1 stop18h 56m

$680

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 8/17

5:45 am-11:10 am

2 stops21h 25m

Dublin

Thu 9/3

9:30 am-10:58 pm

2 stops21h 28m

$685

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/2

Showing 1-10 of 42 resultsSorted by cheapest first
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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 $749). 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 6, 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
11,393 reviews

Crew

8.0

Food

6.4

Boarding

7.5

Overall

7.1

Comfort

7.2

Entertainment

6.9

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
7.1
Good
11,393 reviews
American Airlines
7.1
Good
11,393 reviews

Crew

8.0

Food

6.4

Boarding

7.5

Overall

7.1

Comfort

7.2

Entertainment

6.9

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, British Airways, and KLM 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 35m. 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 $749). 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 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$890FlexibilityNo cancel feeOn-time71%

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