HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ireland

$394+ 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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
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.

Find 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 November 13, 2025.

This United Airlines deal was found by Cheapflights users on 11/12. 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 11/267:00 amONT - DUB
1 stop17h 10mUnited Airlines
Wed 12/39:00 amDUB - ONT
2 stops35h 32mUnited Airlines
Deal found 11/12$524
This Air Canada deal was found by Cheapflights users on 11/12. 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.
Tue 11/255:05 amONT - DUB
2 stops18h 05mAir Canada
Fri 12/59:00 amDUB - ONT
2 stops19h 42mAir Canada
Deal found 11/12$546
This United Airlines deal was found by Cheapflights users on 11/12. 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 11/237:00 amONT - DUB
1 stop17h 10mUnited Airlines
Wed 12/39:00 amDUB - ONT
2 stops19h 42mUnited Airlines
Deal found 11/12$547
This Delta deal was found by Cheapflights users on 11/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/267:05 amONT - DUB
1 stop16h 40mDelta
Wed 12/35:55 amDUB - ONT
2 stops19h 13mDelta
Deal found 11/13$550
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Tue 11/257:00 amONT - DUB
1 stop17h 10mUnited Airlines
Wed 12/310:40 amDUB - ONT
2 stops20h 09mUnited Airlines
Deal found 11/13$552
This Delta deal was found by Cheapflights users on 11/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/247:05 amONT - DUB
1 stop16h 40mDelta
Fri 12/59:45 amDUB - ONT
1 stop33h 17mDelta
Deal found 11/12$558
This Justfly.com deal was found by Cheapflights users on 11/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/245:05 amONT - DUB
2 stops42h 05mAir Canada
Wed 1/149:00 amDUB - ONT
2 stops43h 58mAir Canada
Deal found 11/11$560
This United Airlines deal was found by Cheapflights users on 11/12. 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.
Sat 12/2711:59 pmONT - DUB
1 stop24h 11mUnited Airlines
Fri 1/910:40 amDUB - ONT
2 stops18h 18mUnited Airlines
Deal found 11/12$563
This Delta deal was found by Cheapflights users on 11/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2310:25 pmONT - DUB
1 stop25h 20mDelta
Fri 12/59:45 amDUB - ONT
1 stop33h 17mDelta
Deal found 11/12$565
This KAYAK deal was found by Cheapflights users on 11/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1012:46 pmONT - ORK
2 stops18h 39mBritish Airways
Fri 1/167:40 amORK - ONT
2 stops22h 33mBritish Airways
Deal found 11/12$1,084
This Cheapflightsfares deal was found by Cheapflights users on 11/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:42 pmONT - ORK
2 stops16h 43mMultiple Airlines
Sat 1/311:55 amORK - ONT
2 stops18h 19mMultiple Airlines
Deal found 11/12$3,834

Cheap flight deals from Ontario to Ireland

Keep the following information in mind while searching for Ontario to Ireland flight deals. Data was last updated November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$524
(United Airlines)

One-way from

$394
(Priceline)

Popular in

June

Cheapest in

February

Average price

$668
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. 19% potential increase in price ($178 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 November 13, 2025.
Use the filters below to find and compare flights from Ontario to Ireland that are best for you.

Fly from

Ontario

Fly to

Ireland

Route

Depart

Return

Price

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/26

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/3

9:00 am-12:32 pm

2 stops35h 32m

$524

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/25

5:05 am-7:10 am

2 stops18h 05m

Dublin

Wed 12/3

9:00 am-8:42 pm

2 stops19h 42m

$546

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/25

7:00 am-8:10 am

1 stop17h 10m

Dublin

Fri 12/5

9:00 am-8:42 pm

2 stops19h 42m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/26

7:00 am-8:10 am

1 stop17h 10m

Dublin

Fri 12/5

9:00 am-8:42 pm

2 stops19h 42m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 11/25

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/3

9:00 am-8:42 pm

2 stops19h 42m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/24

7:00 am-8:10 am

1 stop17h 10m

Dublin

Wed 12/3

9:00 am-8:42 pm

2 stops19h 42m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/24

7:00 am-8:10 am

1 stop17h 10m

Dublin

Fri 12/5

9:00 am-8:42 pm

2 stops19h 42m

$547

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/26

7:05 am-7:45 am

1 stop16h 40m

Dublin

Thu 12/4

5:55 am-10:47 pm

2 stops24h 52m

$550

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 12/24

5:05 am-7:10 am

2 stops42h 05m

Dublin

Wed 1/14

9:00 am-8:58 pm

2 stops43h 58m

$560

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Mon 4/6

7:00 am-10:15 am

2 stops19h 15m

Shannon

Mon 4/20

12:30 pm-10:26 pm

2 stops17h 56m

$567

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 32 results
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

What is the cheapest month to book a flight from Ontario to Ireland?

Currently, December is the cheapest month in which you can book a flight from Ontario to Ireland (average of $428). Flying from Ontario to Ireland in June is currently the most expensive (average of $682). 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.

What is the cheapest time of day to fly from ONT to IE?

Find hourly flight availability from Ontario to Ireland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

When flying from Ontario to Ireland, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 42% versus a flight in the afternoon.

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 November 13, 2025.
Read through reviews of airlines operating flights from Ontario to Ireland, such as Delta, American Airlines, and Iberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.1

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,007 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.1

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
11,049 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.1

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
3,010 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Overall

7.9

Comfort

7.9

Boarding

8.1

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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, Air Canada, and British Airways fly from Ontario to Ireland in about 16h 32m. The time it takes to get you to your destination can typically vary by up to 1h 33m. 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 - Cork or Ontario - Shannon 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, December is the cheapest month in which you can book a flight from Ontario to Ireland (average of $428). Flying from Ontario to Ireland in June is currently the most expensive (average of $682). 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
San Francisco to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
Los Angeles to Orly flights
Los Angeles to Gatwick flights
Los Angeles to Istanbul flights
Los Angeles to London City flights
San Francisco to Istanbul flights
Los Angeles to Madrid flights
San Francisco to Gatwick flights
San Francisco to Leonardo da Vinci/Fiumicino flights
Los Angeles to Frankfurt flights
San Francisco to London City flights
San Francisco to Frankfurt flights
San Francisco to Lisbon flights
Los Angeles to Stansted flights
Los Angeles to Amsterdam flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Barcelona-El Prat flights
Los Angeles to Dublin flights
Ontario to Charles de Gaulle flights
San Francisco to Amsterdam flights
Los Angeles to Luton flights
Los Angeles to Zurich flights
Ontario to Heathrow flights
San Francisco to Zurich flights
San Diego to Heathrow flights
San Francisco to Orly flights
Santa Ana to Heathrow flights
San Francisco to Dublin flights
Los Angeles to Lisbon flights
San Francisco to Madrid flights
San Francisco to Stansted flights
Santa Ana to Charles de Gaulle flights
San Francisco to Malpensa flights
Los Angeles to Beauvais-Tille flights
San Francisco to Munich flights
Los Angeles to Athens flights
Los Angeles to Copenhagen flights
San Francisco to Linate flights
Los Angeles to Malpensa flights
Los Angeles to Munich flights
San Francisco to Luton flights
Ontario to Leonardo da Vinci/Fiumicino flights
Burbank to Charles de Gaulle flights
Las Vegas to Heathrow flights
Los Angeles to Sabiha Gokcen flights
San Francisco to Copenhagen flights

Top 3 airlines flying from Ontario to Ireland

Discover the top 3 airlines 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$786FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$677Average$932FlexibilityNo 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.