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$309+ 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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Mrz 21 — Mrz 281
Sa 3/21
Sa 3/28
1 adult, Economy
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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 Februar 19, 2026.

This United Airlines deal was found by Cheapflights users on 2/17. 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.
Mi 8/197:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Do 8/279:50 am
DUB
-
ONT
2 stops45h 16m
United Airlines
Deal found 2/17$628
This United Airlines deal was found by Cheapflights users on 2/15. 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.
Mi 4/17:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Mi 4/89:50 am
DUB
-
ONT
2 stops44h 36m
United Airlines
Deal found 2/15$633
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Di 9/86:30 pm
ONT
-
DUB
2 stops29h 15m
United Airlines
Mi 9/169:20 am
DUB
-
ONT
2 stops35h 00m
United Airlines
Deal found 2/17$637
This Gotogate deal was found by Cheapflights users on 2/17. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 4/146:00 am
ONT
-
DUB
2 stops18h 15m
Air Canada
Mi 4/229:50 am
DUB
-
ONT
2 stops34h 30m
Air Canada
Deal found 2/17$642
This Air Canada deal was found by Cheapflights users on 2/15. 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.
So 8/306:30 pm
ONT
-
DUB
2 stops53h 45m
Air Canada
Di 9/89:20 am
DUB
-
ONT
2 stops43h 00m
Air Canada
Deal found 2/15$643
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Mo 3/2311:59 pm
ONT
-
DUB
1 stop25h 11m
United Airlines
Di 3/3111:35 am
DUB
-
ONT
1 stop18h 51m
United Airlines
Deal found 2/18$651
This Iberia deal was found by Cheapflights users on 2/15. 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.
Mi 4/12:39 pm
ONT
-
DUB
2 stops19h 21m
Multiple Airlines
Mi 4/89:50 am
DUB
-
ONT
2 stops21h 56m
Multiple Airlines
Deal found 2/15$652
This Billigflug deal was found by Cheapflights users on 2/18. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 3/1610:25 pm
ONT
-
DUB
1 stop26h 20m
Air France
Mi 4/111:00 am
DUB
-
ONT
1 stop18h 00m
Air France
Deal found 2/18$656
This United Airlines deal was found by Cheapflights users on 2/15. 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.
Mi 8/267:00 am
ONT
-
DUB
1 stop18h 45m
United Airlines
Di 9/89:50 am
DUB
-
ONT
2 stops20h 36m
United Airlines
Deal found 2/15$657
This Air Canada deal was found by Cheapflights users on 2/16. 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.
Mo 3/305:10 am
ONT
-
DUB
2 stops19h 05m
Air Canada
Mi 4/89:50 am
DUB
-
ONT
2 stops18h 46m
Air Canada
Deal found 2/16$658
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Mo 3/95:15 am
ONT
-
DUB
2 stops19h 15m
United Airlines
Do 3/2610:40 am
DUB
-
ONT
1 stop18h 38m
United Airlines
Deal found 2/18$659

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 Februar 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$633
(United Airlines)

One-way from

$309
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$637
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. 18% potential increase in price ($172 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 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 Februar 19, 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

Mo 3/23

11:59 pm-8:10 am

1 stop25h 11m

Dublin

Di 3/31

11:35 am-10:26 pm

1 stop18h 51m

$651

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mo 3/9

5:15 am-7:30 am

2 stops19h 15m

Dublin

Do 3/26

10:40 am-10:18 pm

1 stop18h 38m

$659

OntarioDublin

ONT - DUB

ONTDUB

Ontario

So 4/12

7:00 am-9:45 am

1 stop18h 45m

Dublin

Di 4/28

11:35 am-10:26 pm

1 stop18h 51m

$660

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mi 4/1

7:00 am-9:45 am

1 stop18h 45m

Dublin

Mi 4/8

11:35 am-10:26 pm

1 stop18h 51m

$660

OntarioDublin

ONT - DUB

ONTDUB

Ontario

So 4/12

6:00 am-7:55 am

2 stops17h 55m

Dublin

Di 4/28

5:55 am-4:25 pm

2 stops18h 30m

$662

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mi 4/1

6:05 am-7:20 am

2 stops17h 15m

Dublin

Di 4/7

11:35 am-10:26 pm

1 stop18h 51m

$665

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fr 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Di 4/28

9:50 am-5:47 pm

3 stops39h 57m

$666

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fr 4/24

7:00 am-9:45 am

1 stop18h 45m

Dublin

Di 5/12

9:50 am-10:59 pm

2 stops45h 09m

$666

OntarioDublin

ONT - DUB

ONTDUB

Ontario

So 8/9

11:59 pm-9:00 am

1 stop25h 01m

$395

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mo 7/27

11:59 pm-9:00 am

1 stop25h 01m

$410

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/17

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, January is the cheapest month in which you can book a flight from Ontario to Dublin (average of $436). Flying from Ontario to Dublin 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 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 Februar 19, 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
11,313 reviews

Food

6.4

Overall

7.2

Entertainment

6.9

Boarding

7.5

Comfort

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
11,313 reviews
American Airlines
7.2
Good
11,313 reviews

Food

6.4

Overall

7.2

Entertainment

6.9

Boarding

7.5

Comfort

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 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.

  • 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.

  • 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, January is the cheapest month in which you can book a flight from Ontario to Dublin (average of $436). Flying from Ontario to Dublin 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

Traveling to a place near Dublin?

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

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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 Februar 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$683Average$886FlexibilityNo cancel feeOn-time71%

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