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$423+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
1 adult, Economy
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Cheap 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 October 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$524
(United Airlines)

One-way from

$423
(Kiwi.com)

Popular in

April

Cheapest in

December

Average price

$799
Provider with most accurate pricing for Ontario-Dublin flight deals.
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Provider most trusted by Cheapflights users for Ontario-Dublin flights.
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From Ontario to Dublin
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One-way flight from Ontario to Dublin
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 October 14, 2025.

This KLM deal was found by Cheapflights users on 10/14. 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.
Mon 10/2011:36 amONT - DUB
1 stop13h 09mKLM
Wed 11/59:45 amDUB - ONT
1 stop17h 34mKLM
Deal found 10/14$543
This Delta deal was found by Cheapflights users on 10/14. 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 12/37:05 amONT - DUB
1 stop16h 40mDelta
Thu 12/115:55 amDUB - ONT
2 stops24h 52mDelta
Deal found 10/14$551
This United Airlines deal was found by Cheapflights users on 10/14. 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 10/297:00 amONT - DUB
1 stop18h 10mUnited Airlines
Thu 11/612:05 pmDUB - ONT
2 stops18h 46mUnited Airlines
Deal found 10/14$552
This American Airlines deal was found by Cheapflights users on 10/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/84:47 pmONT - DUB
2 stops16h 58mAmerican Airlines
Sun 12/1412:55 pmDUB - ONT
1 stop19h 00mAmerican Airlines
Deal found 10/14$593
This American Airlines deal was found by Cheapflights users on 10/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/64:47 pmONT - DUB
2 stops16h 58mAmerican Airlines
Thu 11/1311:30 amDUB - ONT
2 stops20h 27mAmerican Airlines
Deal found 10/13$598
This Delta deal was found by Cheapflights users on 10/13. 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.
Fri 11/287:05 amONT - DUB
1 stop16h 40mDelta
Thu 12/45:55 amDUB - ONT
2 stops19h 13mDelta
Deal found 10/13$600
This United Airlines deal was found by Cheapflights users on 10/14. 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 10/297:00 amONT - DUB
1 stop18h 10mUnited Airlines
Mon 11/310:40 amDUB - ONT
1 stop15h 56mUnited Airlines
Deal found 10/14$602
This Iberia deal was found by Cheapflights users on 10/13. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2810:47 amONT - DUB
2 stops19h 33mMultiple Airlines
Thu 12/41:10 pmDUB - ONT
2 stops18h 45mMultiple Airlines
Deal found 10/13$603
This British Airways deal was found by Cheapflights users on 10/13. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/208:15 amONT - DUB
2 stops17h 25mBritish Airways
Wed 11/58:50 amDUB - ONT
2 stops21h 39mBritish Airways
Deal found 10/13$605

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 October 14, 2025.
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 12/3

7:05 am-7:45 am

1 stop16h 40m

Dublin

Wed 12/10

5:55 am-5:07 pm

2 stops19h 12m

$551

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 12/3

7:05 am-7:45 am

1 stop16h 40m

Dublin

Thu 12/11

5:55 am-10:47 pm

2 stops24h 52m

$551

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

7:00 am-8:10 am

1 stop18h 10m

Dublin

Thu 11/6

10:40 am-10:31 pm

1 stop19h 51m

$552

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

7:00 am-8:10 am

1 stop18h 10m

Dublin

Mon 11/3

10:40 am-6:36 pm

1 stop15h 56m

$602

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 12/5

7:05 am-7:45 am

1 stop16h 40m

Dublin

Wed 12/10

9:45 am-11:04 pm

1 stop21h 19m

$602

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 2/1

6:00 am-7:30 am

2 stops17h 30m

Dublin

Mon 2/16

9:30 am-9:19 pm

2 stops19h 49m

$607

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 12/27

11:59 pm-8:10 am

1 stop24h 11m

Dublin

Sat 1/10

10:40 am-8:58 pm

2 stops18h 18m

$613

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 12/30

11:59 pm-8:10 am

1 stop24h 11m

Dublin

Fri 1/9

10:40 am-10:53 pm

2 stops20h 13m

$646

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 4/1

6:00 am-1:15 pm

3 stops23h 15m

$435

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/12

6:00 am-7:30 am

2 stops17h 30m

$468

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/14

Showing 1-10 of 19 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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 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 $420). 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.

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

Find hourly flight availability from Ontario to Dublin. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 14, 2025.

One of the essential ways to save on airfare from Ontario to Dublin is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight at noon could potentially save you up to 18% on airfare.

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 October 14, 2025.
Peruse reviews from past customers who have flown with Delta, American Airlines, and Iberia 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.
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

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
8.0
Very good
7,972 reviews
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

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
11,040 reviews
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

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
2,988 reviews
Delta
8.0
Very good
7,972 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

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 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 $551, Delta can have you in Dublin from Ontario in 16h 40m. There are 5132 mi between Ontario and Dublin. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ontario to Dublin round-trip?

    Cheapflights users have booked flights from Ontario to Dublin round-trip from $527. Other airlines that can offer you cheap pricing are Iberia, from $547, and American Airlines, from $623. Users have found that Delta is 34% 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, January is the cheapest month in which you can book a flight from Ontario to Dublin (average of $420). 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
Swords
Wicklow
Leixlip

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Top 3 airlines flying from Ontario to Dublin

Discover the top 3 airlines 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 October 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$846FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$786FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$623Average$975FlexibilityNo cancel feeOn-time71%

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