HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ireland

$418+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Jun 4 — Jun 111
Thu 6/4
Thu 6/11
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 May 5, 2026.

This United Airlines deal was found by Cheapflights users on 5/3. 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.
Sun 9/67:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
Wed 9/99:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 5/3$791
This United Airlines deal was found by Cheapflights users on 5/1. 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.
Tue 8/115:00 am
ONT
-
SNN
2 stops18h 30m
United Airlines
Tue 8/259:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 5/1$841
This SmartFares deal was found by Cheapflights users on 5/3. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1411:50 pm
ONT
-
DUB
1 stop25h 10m
JetBlue
Fri 8/2111:30 am
DUB
-
ONT
1 stop19h 05m
JetBlue
Deal found 5/3$846
This United Airlines deal was found by Cheapflights users on 4/30. 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 8/297:13 pm
ONT
-
SNN
2 stops28h 17m
United Airlines
Tue 9/19:30 am
SNN
-
ONT
1 stop16h 49m
United Airlines
Deal found 4/30$855
This Air Canada deal was found by Cheapflights users on 5/2. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/205:00 am
ONT
-
DUB
2 stops19h 15m
Air Canada
Fri 11/69:00 am
DUB
-
ONT
2 stops43h 20m
Air Canada
Deal found 5/2$857
This Air Canada deal was found by Cheapflights users on 5/2. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/231:18 pm
ONT
-
DUB
2 stops57h 52m
Air Canada
Fri 11/69:00 am
DUB
-
ONT
2 stops43h 20m
Air Canada
Deal found 5/2$863
This Priceline deal was found by Cheapflights users on 5/2. 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 Priceline 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 5/2$868
This CheapOair deal was found by Cheapflights users on 5/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:00 am
ONT
-
DUB
2 stops18h 45m
Air Canada
Wed 9/169:50 am
DUB
-
ONT
2 stops21h 08m
Air Canada
Deal found 5/4$871
This United Airlines deal was found by Cheapflights users on 5/2. 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 10/207:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Fri 11/69:00 am
DUB
-
ONT
2 stops21h 26m
United Airlines
Deal found 5/2$872
This Delta deal was found by Cheapflights users on 5/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2012:00 pm
ONT
-
DUB
1 stop12h 45m
Delta
Tue 11/39:40 am
DUB
-
ONT
1 stop16h 38m
Delta
Deal found 5/2$875
This United Airlines deal was found by Cheapflights users on 5/2. 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 10/255:00 am
ONT
-
DUB
2 stops19h 30m
United Airlines
Thu 11/512:05 pm
DUB
-
ONT
2 stops18h 21m
United Airlines
Deal found 5/2$880
This United Airlines deal was found by Cheapflights users on 5/3. 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.
Thu 11/197:00 am
ONT
-
DUB
1 stop17h 10m
United Airlines
Wed 12/99:00 am
DUB
-
ONT
2 stops44h 21m
United Airlines
Deal found 5/3$881

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 May 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$791
(United Airlines)

One-way from

$418
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$887
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 ($215 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 5, 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

Wed 9/9

9:30 am-6:19 pm

1 stop16h 49m

$791

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 8/29

7:13 pm-7:30 am

2 stops28h 17m

Shannon

Tue 9/1

9:30 am-6:19 pm

1 stop16h 49m

$855

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/28

7:00 am-7:45 am

1 stop17h 45m

Dublin

Fri 11/6

9:45 am-6:18 pm

1 stop16h 33m

$875

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sun 5/31

6:00 am-7:30 am

2 stops17h 30m

Shannon

Tue 6/16

12:30 pm-10:37 pm

2 stops18h 07m

$892

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 8/17

7:00 am-7:30 am

1 stop16h 30m

Shannon

Sat 8/22

9:30 am-6:19 pm

1 stop16h 49m

$900

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 6/1

10:41 pm-9:00 am

1 stop26h 19m

Dublin

Mon 6/15

11:30 am-10:43 pm

1 stop19h 13m

$979

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 5/27

6:30 am-9:45 am

1 stop19h 15m

Dublin

Wed 6/3

9:20 am-10:51 pm

2 stops21h 31m

$1,036
Quickest round-trip

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 5/27

7:05 am-8:45 am

1 stop17h 40m

Dublin

Tue 6/2

11:00 am-6:36 pm

1 stop15h 36m

$1,040

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 5/31

6:30 am-9:45 am

1 stop19h 15m

Dublin

Thu 6/18

11:35 am-10:51 pm

1 stop19h 16m

$1,040

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 5/24

7:05 am-8:45 am

1 stop17h 40m

Dublin

Mon 6/1

11:00 am-9:48 pm

1 stop18h 48m

$1,100

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/3

Showing 1-10 of 37 resultsSorted by cheapest first
1
2
3
4

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 May 5, 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
11,667 reviews

Comfort

7.2

Crew

7.9

Entertainment

6.9

Boarding

7.5

Food

6.4

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
11,667 reviews
American Airlines
7.1
Good
11,667 reviews

Comfort

7.2

Crew

7.9

Entertainment

6.9

Boarding

7.5

Food

6.4

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, JetBlue, 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 9h 49m. 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

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 Leonardo da Vinci/Fiumicino flights
Los Angeles to Charles de Gaulle flights
San Francisco to Heathrow flights
San Francisco to Charles de Gaulle flights
San Francisco to Leonardo da Vinci/Fiumicino flights
Los Angeles to Madrid flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Istanbul flights
Los Angeles to Gatwick flights
Los Angeles to Stansted flights
Los Angeles to London City flights
San Francisco to Istanbul flights
Los Angeles to Frankfurt flights
San Francisco to Gatwick flights
Los Angeles to Orly flights
San Francisco to London City flights
San Francisco to Stansted flights
San Francisco to Dublin flights
Los Angeles to Dublin flights
Los Angeles to Lisbon flights
San Francisco to Lisbon flights
Los Angeles to Athens flights
San Francisco to Frankfurt flights
San Francisco to Athens flights
Los Angeles to Barcelona-El Prat flights
Los Angeles to Amsterdam flights
Santa Rosa to Berlin flights
San Diego to Heathrow flights
San Francisco to Amsterdam flights
Los Angeles to Malpensa flights
Los Angeles to Copenhagen flights
Los Angeles to Zurich flights
Ontario to Heathrow flights
San Francisco to Zurich flights
San Francisco to Madrid flights
San Francisco to Copenhagen flights
San Francisco to Malpensa flights
Los Angeles to Frederic Chopin flights
Los Angeles to Luton flights
Los Angeles to Munich flights
Ontario to Leonardo da Vinci/Fiumicino flights
Las Vegas to Heathrow flights
Los Angeles to Keflavik Intl flights
San Francisco to Munich 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 May 5, 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.