HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dublin

$346+ Cheap flights from Ontario (ONT) to Dublin (DUB)

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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Mar 7 — Mar 141
Sat 3/7
Sat 3/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Dublin 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 Dublin

Cheapest flights from Ontario to Dublin
Explore the most affordable flight options available from Ontario to Dublin. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 5, 2026.

This United Airlines deal was found by Cheapflights users on 2/3. 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.
Wed 10/287:00 am
ONT
-
DUB
1 stop18h 10m
United Airlines
Wed 11/119:00 am
DUB
-
ONT
2 stops44h 21m
United Airlines
Deal found 2/3$628
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 4/147:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Tue 4/289:50 am
DUB
-
ONT
2 stops44h 55m
United Airlines
Deal found 2/3$633
This United Airlines deal was found by Cheapflights users on 2/5. 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 4/16:05 am
ONT
-
DUB
2 stops20h 35m
United Airlines
Wed 4/159:50 am
DUB
-
ONT
2 stops44h 36m
United Airlines
Deal found 2/5$638
This KAYAK deal was found by Cheapflights users on 2/3. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/142:08 pm
ONT
-
DUB
2 stops20h 42m
British Airways
Tue 4/288:35 am
DUB
-
ONT
2 stops22h 00m
British Airways
Deal found 2/3$639
This Iberia deal was found by Cheapflights users on 2/5. 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.
Tue 10/2010:57 am
ONT
-
DUB
2 stops19h 38m
Multiple Airlines
Tue 11/31:00 pm
DUB
-
ONT
1 stop17h 23m
Multiple Airlines
Deal found 2/5$647
This United Airlines deal was found by Cheapflights users on 2/5. 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
Tue 11/310:40 am
DUB
-
ONT
1 stop19h 46m
United Airlines
Deal found 2/5$655
This United Airlines deal was found by Cheapflights users on 2/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:15 am
ONT
-
DUB
2 stops18h 15m
United Airlines
Tue 3/1710:40 am
DUB
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/4$658
This Delta deal was found by Cheapflights users on 2/5. 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 4/197:05 am
ONT
-
DUB
1 stop17h 40m
Delta
Wed 4/2911:00 am
DUB
-
ONT
1 stop15h 33m
Delta
Deal found 2/5$660
This United Airlines deal was found by Cheapflights users on 2/5. 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 3/15:00 am
ONT
-
DUB
2 stops18h 30m
United Airlines
Sun 3/88:00 am
DUB
-
ONT
2 stops35h 48m
United Airlines
Deal found 2/5$664

Find flight deals from Ontario to Dublin

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Dublin (DUB). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$633
(United Airlines)

One-way from

$346
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$772
Provider with most accurate pricing for Ontario-Dublin flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Dublin flights.
Search Deals
From Ontario to Dublin
Search Deals
One-way flight from Ontario to Dublin
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($81 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($26 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 Dublin 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 5, 2026.
Use the filters below to find and compare flights from Ontario to Dublin that are best for you.

Fly from

Ontario

Fly to

Dublin

Route

Depart

Return

Price

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 3/11

6:15 am-7:30 am

2 stops18h 15m

Dublin

Wed 3/18

10:40 am-10:18 pm

1 stop18h 38m

$658

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 3/11

6:15 am-7:30 am

2 stops18h 15m

Dublin

Tue 3/17

10:40 am-10:18 pm

1 stop18h 38m

$658

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 4/19

7:05 am-8:45 am

1 stop17h 40m

Dublin

Wed 4/29

11:00 am-6:33 pm

1 stop15h 33m

$660

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 4/14

5:10 am-10:40 am

3 stops21h 30m

Dublin

Tue 4/28

9:50 am-8:36 pm

2 stops18h 46m

$661

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 4/1

6:05 am-10:40 am

2 stops20h 35m

Dublin

Wed 4/15

11:35 am-10:26 pm

1 stop18h 51m

$665

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

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Tue 5/12

9:50 am-8:36 pm

2 stops42h 46m

$666

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 7/27

11:25 pm-9:00 am

1 stop25h 35m

$395

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 8/2

11:25 pm-9:00 am

1 stop25h 35m

$395

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 7/26

7:20 am-9:40 am

2 stops18h 20m

$457

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 18 results
1
2

Compare providers for flights from Ontario to Dublin

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Dublin in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Dublin flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Dublin flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Dublin flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Dublin flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Dublin flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Dublin

Have a flexible travel schedule? Discover the best time to fly to Dublin 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 Dublin

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

Currently, November is the cheapest month in which you can book a flight from Ontario to Dublin (average of $454). Flying from Ontario to Dublin 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.

Reviews of airlines servicing Dublin

Get insights into the airlines that provide service to Dublin. 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 Dublin. Reviews last updated February 5, 2026.
Peruse reviews from past customers who have flown with American Airlines from Ontario to Dublin to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,237 reviews

Food

6.4

Boarding

7.5

Entertainment

6.9

Comfort

7.2

Crew

8.0

Overall

7.2

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
11,237 reviews
American Airlines
7.2
Good
11,237 reviews

Food

6.4

Boarding

7.5

Entertainment

6.9

Comfort

7.2

Crew

8.0

Overall

7.2

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 Dublin. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Dublin?

    For as low as $633, United Airlines can have you in Dublin from Ontario in 18h 45m. There are 5132 mi between Ontario and Dublin. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Ontario to Dublin round-trip?

    Cheapflights users have booked flights from Ontario to Dublin round-trip from $683. Users have found that American Airlines is 21% cheaper than the other options available to this destination.

  • Can I find deals for flights from Ontario to Dublin that include hotel bookings?

    Yes. In addition to deals on Ontario to Dublin flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Dublin?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Dublin.

  • Can I find deals for business class flights from Ontario to Dublin?

    Yes. Cheapflights offers flight deals from Ontario to Dublin 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 Dublin?

    Currently, November is the cheapest month in which you can book a flight from Ontario to Dublin (average of $454). Flying from Ontario to Dublin 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

Traveling to a place near Dublin?

Book flights to Dublin if you plan to visit one of these locations
Maynooth
Castleknock
Leixlip

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.

Top airline flying from Ontario to Dublin

Discover the top airline that operate flights from Ontario to Dublin. 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 5, 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.