HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
May 15 — May 221
Fri 5/15
Fri 5/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Ireland with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 15, 2026.

This United Airlines deal was found by Cheapflights users on 4/12. 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 9/109:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 4/12$731
This United Airlines deal was found by Cheapflights users on 4/13. 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 9/207:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Tue 9/229:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 4/13$784
This United Airlines deal was found by Cheapflights users on 4/12. 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 11/117:00 am
ONT
-
DUB
1 stop17h 10m
United Airlines
Wed 11/259:00 am
DUB
-
ONT
2 stops44h 21m
United Airlines
Deal found 4/12$848
This United Airlines deal was found by Cheapflights users on 4/14. 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 5/67:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Wed 5/139:20 am
DUB
-
ONT
2 stops45h 15m
United Airlines
Deal found 4/14$853
This Air Canada deal was found by Cheapflights users on 4/10. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/241:43 pm
ONT
-
DUB
2 stops58h 32m
Air Canada
Tue 5/129:50 am
DUB
-
ONT
2 stops42h 46m
Air Canada
Deal found 4/10$867
This FlightHub deal was found by Cheapflights users on 4/13. 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 9/711:50 pm
ONT
-
DUB
1 stop25h 10m
JetBlue
Wed 9/1611:30 am
DUB
-
ONT
1 stop16h 43m
JetBlue
Deal found 4/13$868
This KLM deal was found by Cheapflights users on 4/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/266:00 am
ONT
-
DUB
2 stops17h 55m
KLM
Tue 5/1211:10 am
DUB
-
ONT
2 stops19h 24m
KLM
Deal found 4/11$870
This Air Canada deal was found by Cheapflights users on 4/12. 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 9/98:00 am
ONT
-
DUB
2 stops15h 45m
Multiple Airlines
Wed 9/169:50 am
DUB
-
ONT
2 stops16h 21m
Multiple Airlines
Deal found 4/12$871
This United Airlines deal was found by Cheapflights users on 4/10. 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.
Sat 7/114:20 pm
ONT
-
SNN
2 stops31h 10m
United Airlines
Tue 7/219:30 am
SNN
-
ONT
1 stop21h 21m
United Airlines
Deal found 4/10$872
This KLM deal was found by Cheapflights users on 4/13. 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.
Wed 10/2112:00 pm
ONT
-
DUB
1 stop12h 45m
Multiple Airlines
Tue 11/39:40 am
DUB
-
ONT
1 stop16h 38m
Multiple Airlines
Deal found 4/13$875
This United Airlines deal was found by Cheapflights users on 4/14. 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 9/307:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Wed 10/1412:30 pm
SNN
-
ONT
2 stops18h 36m
United Airlines
Deal found 4/14$876
This Delta deal was found by Cheapflights users on 4/9. 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 8/167:00 am
ONT
-
DUB
1 stop17h 45m
Delta
Wed 8/268:55 am
DUB
-
ONT
2 stops21h 45m
Delta
Deal found 4/9$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 April 15, 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

$719
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. 21% potential increase in price ($202 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 15, 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

7:00 am-7:30 am

1 stop16h 30m

Shannon

Thu 9/10

9:30 am-6:19 pm

1 stop16h 49m

$731

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 9/20

5:45 am-7:30 am

2 stops17h 45m

Shannon

Tue 9/22

9:30 am-6:19 pm

1 stop16h 49m

$784

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 8/18

7:00 am-7:30 am

1 stop16h 30m

Shannon

Tue 9/1

9:30 am-6:19 pm

1 stop16h 49m

$784

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Wed 9/30

7:00 am-10:15 am

2 stops19h 15m

Shannon

Wed 10/14

12:30 pm-11:06 pm

2 stops18h 36m

$876

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 8/18

7:00 am-8:45 am

1 stop17h 45m

Dublin

Tue 9/1

5:55 am-6:01 pm

2 stops20h 06m

$877

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 8/13

7:00 am-7:30 am

1 stop16h 30m

Shannon

Sun 8/23

9:30 am-6:19 pm

1 stop16h 49m

$894

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Fri 5/8

5:00 am-10:15 am

2 stops21h 15m

Shannon

Fri 5/15

12:30 pm-9:41 am

2 stops29h 11m

$896

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 5/2

7:05 am-8:45 am

1 stop17h 40m

Dublin

Tue 5/12

11:00 am-6:36 pm

1 stop15h 36m

$913

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Thu 5/28

6:30 am-7:30 am

1 stop17h 00m

Shannon

Thu 6/4

9:30 am-10:46 pm

1 stop21h 16m

$957

OntarioCork

ONT - ORK

ONTORK

Ontario

Sun 8/30

5:05 pm-4:35 pm

2 stops15h 30m

Cork

Tue 9/8

6:15 am-10:44 pm

2 stops24h 29m

$964

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/13

Showing 1-10 of 55 resultsSorted by cheapest first
1
2
3
...
6

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 $437). Flying from Ontario to Ireland in June is currently the most expensive (average of $746). 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 April 15, 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
11,573 reviews

Entertainment

6.9

Crew

7.9

Boarding

7.5

Comfort

7.2

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Elizabeth,Mar 2026

ORD - MIA

Staff was rude and flight attendants 2 out of 3 looked like they had just been thru a hurricane.
American Airlines
7.1
Good
11,573 reviews
American Airlines
7.1
Good
11,573 reviews

Entertainment

6.9

Crew

7.9

Boarding

7.5

Comfort

7.2

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Elizabeth,Mar 2026

ORD - MIA

Staff was rude and flight attendants 2 out of 3 looked like they had just been thru a hurricane.

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 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 1h 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.

  • 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 $437). Flying from Ontario to Ireland in June is currently the most expensive (average of $746). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Ireland

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Heathrow flights
Los Angeles to Charles de Gaulle flights
San Francisco to Heathrow flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
San Francisco to Charles de Gaulle flights
San Francisco to Leonardo da Vinci/Fiumicino flights
Los Angeles to Gatwick flights
Los Angeles to Madrid flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Stansted flights
Los Angeles to Istanbul flights
San Francisco to Istanbul flights
San Francisco to Gatwick flights
Los Angeles to London City flights
Los Angeles to Dublin flights
Los Angeles to Barcelona-El Prat flights
San Francisco to Stansted flights
Los Angeles to Amsterdam flights
Los Angeles to Lisbon flights
San Francisco to London City flights
San Francisco to Dublin flights
Los Angeles to Frankfurt flights
San Francisco to Lisbon flights
Los Angeles to Athens flights
San Diego to Heathrow flights
San Francisco to Frankfurt flights
San Francisco to Zurich flights
San Francisco to Athens flights
San Francisco to Madrid flights
San Francisco to Amsterdam flights
Los Angeles to Frederic Chopin flights
Ontario to Heathrow flights
Los Angeles to Malpensa flights
Los Angeles to Copenhagen flights
Los Angeles to Zurich flights
Los Angeles to Luton flights
San Francisco to Malpensa flights
Los Angeles to Orly flights
Ontario to Leonardo da Vinci/Fiumicino flights
San Francisco to Munich flights
San Francisco to Copenhagen flights
Los Angeles to Munich flights
Las Vegas to Heathrow flights
San Francisco to Linate flights

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 April 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$975FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights