HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ireland

$293+ 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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Mar 29 — Apr 51
Sun 3/29
Sun 4/5
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 February 27, 2026.

This United Airlines deal was found by Cheapflights users on 2/27. 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 4/147:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Tue 4/2112:30 pm
SNN
-
ONT
2 stops17h 20m
United Airlines
Deal found 2/27$590
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Fri 4/246:45 pm
ONT
-
DUB
2 stops52h 35m
United Airlines
Tue 5/129:50 am
DUB
-
ONT
2 stops44h 08m
United Airlines
Deal found 2/24$651
This KLM deal was found by Cheapflights users on 2/23. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/257:00 am
ONT
-
DUB
1 stop16h 45m
KLM
Fri 12/49:45 am
DUB
-
ONT
1 stop16h 33m
KLM
Deal found 2/23$655
This Delta deal was found by Cheapflights users on 2/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:59 am
ONT
-
DUB
2 stops21h 21m
Delta
Wed 3/185:55 am
DUB
-
ONT
2 stops18h 18m
Delta
Deal found 2/24$662
This United Airlines deal was found by Cheapflights users on 2/23. 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.
Fri 4/247:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 4/289:50 am
DUB
-
ONT
3 stops39h 57m
United Airlines
Deal found 2/23$666
This United Airlines deal was found by Cheapflights users on 2/23. 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.
Sun 3/2211:59 pm
ONT
-
DUB
1 stop25h 11m
United Airlines
Tue 3/3111:35 am
DUB
-
ONT
1 stop18h 51m
United Airlines
Deal found 2/23$667
This United Airlines deal was found by Cheapflights users on 2/27. 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 5/16:00 am
ONT
-
SNN
2 stops20h 15m
United Airlines
Thu 5/712:30 pm
SNN
-
ONT
2 stops18h 05m
United Airlines
Deal found 2/27$669
This Air Canada deal was found by Cheapflights users on 2/27. 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.
Mon 5/46:00 am
ONT
-
DUB
2 stops41h 45m
Air Canada
Wed 5/139:50 am
DUB
-
ONT
2 stops31h 51m
Air Canada
Deal found 2/27$674
This Iberia deal was found by Cheapflights users on 2/27. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:00 am
ONT
-
DUB
1 stop16h 15m
Iberia
Thu 11/191:00 pm
DUB
-
ONT
1 stop17h 23m
Iberia
Deal found 2/27$675
This Air Canada deal was found by Cheapflights users on 2/27. 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.
Mon 3/2311:59 pm
ONT
-
DUB
2 stops23h 11m
Multiple Airlines
Wed 4/89:50 am
DUB
-
ONT
2 stops20h 41m
Multiple Airlines
Deal found 2/27$677
This Priceline deal was found by Cheapflights users on 2/27. 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 9/1410:56 pm
ONT
-
DUB
1 stop26h 04m
JetBlue
Tue 9/2211:40 am
DUB
-
ONT
1 stop17h 49m
JetBlue
Deal found 2/27$679
This United Airlines deal was found by Cheapflights users on 2/25. 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 4/257:00 am
ONT
-
SNN
2 stops19h 15m
United Airlines
Sun 5/312:30 pm
SNN
-
ONT
2 stops18h 00m
United Airlines
Deal found 2/25$680

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 February 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$590
(United Airlines)

One-way from

$293
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$636
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. 18% potential increase in price ($173 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 27, 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

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 4/14

7:00 am-10:15 am

2 stops19h 15m

Shannon

Tue 4/21

12:30 pm-9:50 pm

2 stops17h 20m

$590

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Tue 4/28

9:50 am-5:47 pm

3 stops39h 57m

$666

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 4/25

7:00 am-10:15 am

2 stops19h 15m

Shannon

Sun 5/3

12:30 pm-10:30 pm

2 stops18h 00m

$680

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 5/4

7:00 am-9:45 am

1 stop18h 45m

Dublin

Sun 5/10

11:35 am-10:35 pm

1 stop19h 00m

$713

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 3/29

7:00 am-9:45 am

1 stop18h 45m

Dublin

Mon 4/6

11:35 am-10:26 pm

1 stop18h 51m

$713

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Mon 5/4

11:35 am-10:30 pm

1 stop18h 55m

$726

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 3/28

10:25 pm-8:45 am

1 stop26h 20m

Dublin

Sun 4/5

11:00 am-11:47 am

1 stop32h 47m

$781

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Tue 3/17

10:56 am-11:30 am

2 stops17h 34m

Shannon

Thu 4/2

7:30 am-10:07 pm

2 stops22h 37m

$787

OntarioCork

ONT - ORK

ONTORK

Ontario

Fri 4/24

6:00 am-2:25 pm

2 stops24h 25m

Cork

Mon 5/4

3:25 pm-9:00 pm

2 stops37h 35m

$790

OntarioShannon

ONT - SNN

ONTSNN

Ontario

Sat 4/11

7:00 am-10:15 am

2 stops19h 15m

Shannon

Sat 4/18

12:30 pm-9:50 pm

2 stops17h 20m

$797

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/24

Showing 1-10 of 38 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

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 $436). Flying from Ontario to Ireland in June is currently the most expensive (average of $748). 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 February 27, 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
7.2
Good
11,367 reviews

Comfort

7.2

Boarding

7.5

Food

6.4

Entertainment

6.9

Overall

7.2

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.
American Airlines
7.2
Good
11,367 reviews
American Airlines
7.2
Good
11,367 reviews

Comfort

7.2

Boarding

7.5

Food

6.4

Entertainment

6.9

Overall

7.2

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.

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 and British Airways fly from Ontario to Ireland in about 17h 34m. The time it takes to get you to your destination can typically vary by up to 1h 41m. 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 $436). Flying from Ontario to Ireland in June is currently the most expensive (average of $748). 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
San Francisco to Heathrow flights
Los Angeles to Charles de Gaulle flights
San Francisco to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
Los Angeles to Gatwick flights
San Francisco to Leonardo da Vinci/Fiumicino flights
Los Angeles to Istanbul flights
San Francisco to Istanbul flights
Los Angeles to Madrid flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Stansted flights
Los Angeles to Barcelona-El Prat flights
San Francisco to Gatwick flights
Los Angeles to London City flights
Los Angeles to Dublin flights
Los Angeles to Amsterdam flights
San Francisco to Stansted flights
Los Angeles to Frankfurt flights
San Francisco to London City flights
San Francisco to Dublin flights
San Francisco to Frankfurt flights
Ontario to Heathrow flights
San Francisco to Amsterdam flights
San Francisco to Lisbon flights
Los Angeles to Athens flights
Los Angeles to Orly flights
San Diego to Heathrow flights
Los Angeles to Lisbon flights
San Francisco to Zurich flights
San Francisco to Madrid flights
Los Angeles to Luton flights
San Francisco to Athens flights
Los Angeles to Copenhagen flights
Los Angeles to Malpensa flights
San Francisco to Munich flights
Los Angeles to Zurich flights
San Francisco to Copenhagen flights
Ontario to Leonardo da Vinci/Fiumicino flights
Los Angeles to Frederic Chopin flights
San Francisco to Malpensa 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 February 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$890FlexibilityNo 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