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Ireland

$321+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
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 July 24, 2026.

This United Airlines deal was found by Cheapflights users on 7/19. 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 9/67:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Thu 9/179:30 am
SNN
-
ONT
1 stop21h 29m
United Airlines
Deal found 7/19$785
This United Airlines deal was found by Cheapflights users on 7/19. 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 9/67:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Fri 9/189:30 am
SNN
-
ONT
2 stops16h 41m
United Airlines
Deal found 7/19$789
This United Airlines deal was found by Cheapflights users on 7/19. 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 9/55:00 am
ONT
-
SNN
2 stops42h 30m
United Airlines
Thu 9/179:30 am
SNN
-
ONT
1 stop21h 29m
United Airlines
Deal found 7/19$801
This Delta deal was found by Cheapflights users on 7/19. 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 9/57:05 am
ONT
-
SNN
2 stops44h 05m
Delta
Tue 9/151:05 pm
SNN
-
ONT
2 stops39h 00m
Delta
Deal found 7/19$813
This Expedia deal was found by Cheapflights users on 7/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1311:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Wed 8/2611:30 am
DUB
-
ONT
1 stop19h 07m
JetBlue
Deal found 7/20$833
This United Airlines deal was found by Cheapflights users on 7/19. 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 9/107:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Wed 9/169:30 am
SNN
-
ONT
1 stop21h 29m
United Airlines
Deal found 7/19$835
This United Airlines deal was found by Cheapflights users on 7/20. 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 9/37:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Thu 9/109:30 am
SNN
-
ONT
2 stops19h 23m
United Airlines
Deal found 7/20$839
This United Airlines deal was found by Cheapflights users on 7/22. 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 8/215:00 am
ONT
-
SNN
2 stops18h 30m
United Airlines
Fri 9/119:30 am
SNN
-
ONT
2 stops16h 41m
United Airlines
Deal found 7/22$844
This JetBlue deal was found by Cheapflights users on 7/21. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2311:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Tue 9/811:30 am
DUB
-
ONT
1 stop19h 05m
JetBlue
Deal found 7/21$850
This Delta deal was found by Cheapflights users on 7/19. 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.
Wed 9/97:05 am
ONT
-
SNN
2 stops20h 05m
Delta
Mon 9/141:05 pm
SNN
-
ONT
2 stops31h 09m
Delta
Deal found 7/19$853
This United Airlines deal was found by Cheapflights users on 7/23. 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 9/87:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 9/159:20 am
DUB
-
ONT
2 stops45h 39m
United Airlines
Deal found 7/23$853
This United Airlines deal was found by Cheapflights users on 7/24. 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 8/267:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Wed 9/99:20 am
DUB
-
ONT
2 stops40h 51m
United Airlines
Deal found 7/24$857

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 July 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$785
(United Airlines)

One-way from

$321
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,027
Provider with most accurate pricing for Los Angeles Los Angeles-Dublin flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles 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. 24% potential increase in price ($261 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 24, 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

Sun 8/23

9:30 am-10:35 pm

1 stop21h 05m

$835

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 9/7

7:00 am-7:30 am

1 stop16h 30m

Shannon

Sun 9/13

9:30 am-10:59 pm

1 stop21h 29m

$835

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 9/3

7:00 am-7:30 am

1 stop16h 30m

Shannon

Thu 9/10

9:30 am-8:53 pm

2 stops19h 23m

$839

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 8/21

5:00 am-7:30 am

2 stops18h 30m

Shannon

Fri 9/11

9:30 am-6:11 pm

2 stops16h 41m

$844

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 8/17

11:59 pm-9:00 am

1 stop25h 01m

Dublin

Wed 9/2

11:30 am-10:37 pm

1 stop19h 07m

$850
Quickest round-trip

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/11

7:00 am-7:45 am

1 stop16h 45m

Dublin

Wed 11/18

9:45 am-6:18 pm

1 stop16h 33m

$875

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 9/4

7:00 am-10:15 am

2 stops19h 15m

Shannon

Fri 9/11

9:30 am-6:11 pm

2 stops16h 41m

$890

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 9/6

6:08 am-7:30 am

2 stops17h 22m

Shannon

Sun 9/13

12:30 pm-9:59 pm

2 stops17h 29m

$895

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 9/7

7:00 am-7:30 am

1 stop16h 30m

Shannon

Mon 9/21

9:30 am-8:01 pm

2 stops18h 31m

$910

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 8/4

5:26 pm-1:15 pm

2 stops35h 49m

Dublin

Tue 8/18

2:15 pm-11:24 pm

2 stops41h 09m

$967

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/20

Showing 1-10 of 46 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

No data available for this route at this time. Please check back soon.

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 24, 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
11,843 reviews

Overall

7.1

Crew

7.9

Boarding

7.5

Food

6.4

Comfort

7.2

Entertainment

6.8

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.1
Good
11,843 reviews
American Airlines
7.1
Good
11,843 reviews

Overall

7.1

Crew

7.9

Boarding

7.5

Food

6.4

Comfort

7.2

Entertainment

6.8

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

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, JetBlue, 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 8h 31m. 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 - Milltown (Kerry) 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.

See more FAQs

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Alternative routes for Ontario to Ireland

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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 July 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$728Average$1,339FlexibilityNo cancel feeOn-time71%

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