HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ireland

$420+ 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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
jun. 27 — jul. 41
sáb. 6/27
sáb. 7/4
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 mayo 28, 2026.

This United Airlines deal was found by Cheapflights users on 5/26. 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.
sáb. 10/176:32 pm
ONT
-
SNN
2 stops31h 43m
United Airlines
mié. 10/2112:30 pm
SNN
-
ONT
2 stops17h 28m
United Airlines
Deal found 5/26$820
This United Airlines deal was found by Cheapflights users on 5/26. 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.
mié. 8/127:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
mar. 8/259:30 am
SNN
-
ONT
1 stop21h 05m
United Airlines
Deal found 5/26$834
This United Airlines deal was found by Cheapflights users on 5/28. 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.
mié. 8/197:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
mar. 9/19:30 am
SNN
-
ONT
1 stop21h 05m
United Airlines
Deal found 5/28$841
This United Airlines deal was found by Cheapflights users on 5/28. 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.
dom. 8/167:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
vie. 9/49:30 am
SNN
-
ONT
2 stops19h 23m
United Airlines
Deal found 5/28$846
This KLM deal was found by Cheapflights users on 5/26. 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.
dom. 11/157:00 am
ONT
-
DUB
1 stop16h 45m
KLM
mar. 11/249:40 am
DUB
-
ONT
1 stop16h 38m
KLM
Deal found 5/26$875
This United Airlines deal was found by Cheapflights users on 5/23. 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.
dom. 9/67:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
mié. 9/169:20 am
DUB
-
ONT
2 stops16h 56m
United Airlines
Deal found 5/23$876
This United Airlines deal was found by Cheapflights users on 5/26. 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.
mié. 8/127:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
sáb. 8/299:30 am
SNN
-
ONT
1 stop21h 05m
United Airlines
Deal found 5/26$884
This United Airlines deal was found by Cheapflights users on 5/28. 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.
dom. 8/167:00 am
ONT
-
SNN
1 stop16h 30m
United Airlines
dom. 8/309:30 am
SNN
-
ONT
1 stop21h 05m
United Airlines
Deal found 5/28$891
This Cheapflightsfares deal was found by Cheapflights users on 5/26. 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.
mar. 8/1811:50 pm
ONT
-
DUB
1 stop25h 10m
JetBlue
mar. 9/111:30 am
DUB
-
ONT
1 stop19h 05m
JetBlue
Deal found 5/26$893
This United Airlines deal was found by Cheapflights users on 5/23. 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.
mar. 7/286:10 am
ONT
-
SNN
1 stop17h 20m
United Airlines
vie. 8/79:30 am
SNN
-
ONT
1 stop21h 21m
United Airlines
Deal found 5/23$897
This Ovago deal was found by Cheapflights users on 5/26. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/811:24 pm
ONT
-
DUB
1 stop25h 36m
JetBlue
lun. 8/3111:30 am
DUB
-
ONT
1 stop19h 05m
JetBlue
Deal found 5/26$897
This Justfly.com deal was found by Cheapflights users on 5/24. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/1711:50 pm
ONT
-
DUB
1 stop25h 10m
JetBlue
lun. 8/3111:30 am
DUB
-
ONT
1 stop19h 05m
JetBlue
Deal found 5/24$898

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 mayo 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$820
(United Airlines)

One-way from

$420
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$910
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. 23% potential increase in price ($237 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($38 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 mayo 28, 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

sáb. 10/17

7:00 am-10:15 am

2 stops43h 15m

Shannon

mié. 10/21

12:30 pm-10:26 pm

2 stops17h 56m

$831

OntarioShannon

ONT - SNN

ONTSNN

Ontario

mié. 8/19

7:00 am-7:30 am

1 stop16h 30m

Shannon

mié. 8/26

9:30 am-10:35 pm

1 stop21h 05m

$841

OntarioShannon

ONT - SNN

ONTSNN

Ontario

mié. 8/12

7:00 am-7:30 am

1 stop16h 30m

Shannon

mar. 8/25

9:30 am-10:35 pm

1 stop21h 05m

$841

OntarioShannon

ONT - SNN

ONTSNN

Ontario

dom. 8/16

7:00 am-7:30 am

1 stop16h 30m

Shannon

vie. 9/4

9:30 am-10:35 pm

1 stop21h 05m

$841

OntarioShannon

ONT - SNN

ONTSNN

Ontario

lun. 8/10

6:10 am-7:30 am

1 stop17h 20m

Shannon

mar. 8/25

9:30 am-10:35 pm

1 stop21h 05m

$841

OntarioShannon

ONT - SNN

ONTSNN

Ontario

mié. 8/19

7:00 am-7:30 am

1 stop16h 30m

Shannon

dom. 8/30

9:30 am-10:35 pm

1 stop21h 05m

$891

OntarioShannon

ONT - SNN

ONTSNN

Ontario

mié. 7/29

6:10 am-7:30 am

1 stop17h 20m

Shannon

jue. 8/6

9:30 am-10:51 pm

1 stop21h 21m

$897

OntarioShannon

ONT - SNN

ONTSNN

Ontario

mar. 7/28

6:10 am-10:15 am

2 stops20h 05m

Shannon

vie. 8/7

9:30 am-10:51 pm

1 stop21h 21m

$897

OntarioDublin

ONT - DUB

ONTDUB

Ontario

lun. 11/16

7:00 am-7:45 am

1 stop16h 45m

Dublin

lun. 11/23

9:45 am-6:18 pm

1 stop16h 33m

$925

OntarioDublin

ONT - DUB

ONTDUB

Ontario

mar. 8/18

7:00 am-9:45 am

1 stop18h 45m

Dublin

mar. 9/1

9:50 am-10:35 pm

2 stops44h 45m

$928

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/25

Showing 1-10 of 44 resultsSorted by cheapest first
1
2
3
...
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 mayo 28, 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
11,639 reviews

Comfort

7.2

Overall

7.1

Entertainment

6.9

Crew

7.9

Food

6.4

Boarding

7.5

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
11,639 reviews
American Airlines
7.1
Good
11,639 reviews

Comfort

7.2

Overall

7.1

Entertainment

6.9

Crew

7.9

Food

6.4

Boarding

7.5

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 JetBlue fly from Ontario to Ireland in about 16h 45m. The time it takes to get you to your destination can typically vary by up to 14h 58m. There are 5132 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
San Francisco to Barcelona-El Prat flights
Los Angeles to Madrid flights
Los Angeles to Gatwick flights
San Francisco to Istanbul flights
Los Angeles to Stansted flights
Los Angeles to Istanbul flights
San Francisco to Gatwick flights
San Francisco to Stansted flights
Los Angeles to Frankfurt flights
Los Angeles to London City flights
San Francisco to London City flights
San Francisco to Frankfurt flights
Los Angeles to Barcelona-El Prat flights
Los Angeles to Dublin flights
Los Angeles to Orly flights
Los Angeles to Amsterdam flights
San Francisco to Dublin flights
Los Angeles to Athens flights
San Francisco to Zurich flights
San Diego to Heathrow flights
Los Angeles to Frederic Chopin flights
Los Angeles to Lisbon flights
Ontario to Leonardo da Vinci/Fiumicino flights
San Francisco to Amsterdam flights
Los Angeles to Malpensa flights
San Francisco to Athens flights
Ontario to Heathrow flights
San Francisco to Malpensa flights
Los Angeles to Zurich flights
San Francisco to Madrid flights
Los Angeles to Copenhagen flights
San Francisco to Lisbon flights
Los Angeles to Munich flights
Los Angeles to Luton flights
San Francisco to Copenhagen flights
Oakland to Heathrow flights
San Francisco to Linate 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 mayo 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$879FlexibilityNo 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.