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Ireland

$354+ 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Jul 12 — Jul 191
Sun 7/12
Sun 7/19
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 June 12, 2026.

This Delta deal was found by Cheapflights users on 6/9. 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.
Sun 9/67:05 am
ONT
-
SNN
2 stops20h 05m
Delta
Wed 9/91:05 pm
SNN
-
ONT
2 stops30h 09m
Delta
Deal found 6/9$764
This United Airlines deal was found by Cheapflights users on 6/9. 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 9/27:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Wed 9/99:30 am
SNN
-
ONT
1 stop18h 27m
United Airlines
Deal found 6/9$801
This United Airlines deal was found by Cheapflights users on 6/10. 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
Fri 9/189:30 am
SNN
-
ONT
1 stop21h 29m
United Airlines
Deal found 6/10$809
This Air France deal was found by Cheapflights users on 6/10. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1412:00 pm
ONT
-
DUB
1 stop12h 45m
Multiple Airlines
Wed 10/2111:00 am
DUB
-
ONT
1 stop15h 18m
Multiple Airlines
Deal found 6/10$823
This United Airlines deal was found by Cheapflights users on 6/8. 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.
Tue 8/187:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 9/19:50 am
DUB
-
ONT
2 stops44h 45m
United Airlines
Deal found 6/8$848
This United Airlines deal was found by Cheapflights users on 6/11. 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 9/25:00 am
ONT
-
DUB
2 stops18h 45m
United Airlines
Wed 9/99:20 am
DUB
-
ONT
2 stops44h 39m
United Airlines
Deal found 6/11$856
This KLM deal was found by Cheapflights users on 6/9. 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.
Tue 9/87:00 am
ONT
-
SNN
2 stops20h 10m
KLM
Wed 9/161:05 pm
SNN
-
ONT
2 stops18h 32m
KLM
Deal found 6/9$859
This American Airlines deal was found by Cheapflights users on 6/8. 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.
Mon 8/312:35 pm
ONT
-
DUB
1 stop13h 10m
American Airlines
Wed 8/1912:40 pm
DUB
-
ONT
1 stop14h 07m
American Airlines
Deal found 6/8$865
This KAYAK deal was found by Cheapflights users on 6/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2311:50 pm
ONT
-
DUB
1 stop25h 10m
JetBlue
Tue 9/811:30 am
DUB
-
ONT
1 stop19h 05m
JetBlue
Deal found 6/10$866
This United Airlines deal was found by Cheapflights users on 6/9. 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 7/276:10 am
ONT
-
DUB
2 stops17h 35m
United Airlines
Thu 8/209:50 am
DUB
-
ONT
2 stops20h 45m
United Airlines
Deal found 6/9$874
This Delta deal was found by Cheapflights users on 6/8. 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.
Tue 11/37:00 am
ONT
-
DUB
1 stop16h 45m
Delta
Thu 11/129:40 am
DUB
-
ONT
1 stop16h 38m
Delta
Deal found 6/8$875
This Air Canada deal was found by Cheapflights users on 6/7. 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.
Wed 8/269:01 am
ONT
-
DUB
2 stops15h 14m
Multiple Airlines
Wed 9/99:50 am
DUB
-
ONT
2 stops16h 26m
Multiple Airlines
Deal found 6/7$876

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 June 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$764
(Delta)

One-way from

$354
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$1,209
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. 24% potential increase in price ($249 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 12, 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 9/6

7:05 am-11:10 am

2 stops20h 05m

Shannon

Wed 9/9

1:05 pm-11:14 am

2 stops30h 09m

$764

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 9/10

7:00 am-7:30 am

1 stop16h 30m

Shannon

Fri 9/18

9:30 am-10:59 pm

1 stop21h 29m

$809

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/4

7:00 am-7:45 am

1 stop16h 45m

Dublin

Wed 11/11

9:45 am-6:18 pm

1 stop16h 33m

$875

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 8/18

7:00 am-9:45 am

1 stop18h 45m

Dublin

Tue 9/1

11:35 am-10:35 pm

1 stop19h 00m

$879

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 7/27

6:10 am-7:30 am

1 stop17h 20m

Shannon

Mon 8/3

9:30 am-12:12 pm

2 stops34h 42m

$920

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 10/10

8:00 am-10:15 am

2 stops18h 15m

Shannon

Sat 10/17

12:30 pm-10:49 pm

2 stops18h 19m

$930

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 11/8

7:00 am-11:30 am

2 stops20h 30m

Shannon

Thu 11/12

7:50 am-11:57 pm

2 stops24h 07m

$950

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 12/4

5:00 am-10:20 am

3 stops21h 20m

Dublin

Sun 12/13

9:00 am-11:06 pm

2 stops22h 06m

$976

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/16

6:00 am-10:15 am

2 stops20h 15m

Dublin

Mon 11/23

11:30 am-10:39 pm

2 stops19h 09m

$998

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 7/9

5:45 am-7:30 am

2 stops17h 45m

Shannon

Thu 7/16

9:30 am-10:51 pm

1 stop21h 21m

$1,002

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 48 resultsSorted by cheapest first
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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 June 12, 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
11,645 reviews

Crew

7.9

Food

6.4

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Overall

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Apr 2026

DFW - BDL

They keep changing the gate, delaying the hours and then finally canceled it. No accomodation, no food, nothing!
American Airlines
7.1
Good
11,645 reviews
American Airlines
7.1
Good
11,645 reviews

Crew

7.9

Food

6.4

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Overall

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Apr 2026

DFW - BDL

They keep changing the gate, delaying the hours and then finally canceled it. No accomodation, no food, nothing!

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 Delta 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 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.

See more FAQs

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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 June 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$728Average$886FlexibilityNo cancel feeOn-time71%

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