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$365+ Cheap flights from Ontario (ONT) to Dublin (DUB)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
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 July 29, 2026.

This Trip.com deal was found by Cheapflights users on 7/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2312:37 pm
ONT
-
DUB
1 stop13h 08m
Iberia
Wed 10/712:40 pm
DUB
-
ONT
1 stop16h 31m
Iberia
Deal found 7/28$365
This Expedia deal was found by Cheapflights users on 7/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1311:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Thu 8/2711:30 am
DUB
-
ONT
1 stop19h 08m
JetBlue
Deal found 7/29$815
This JetBlue deal was found by Cheapflights users on 7/27. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2411:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Wed 9/911:30 am
DUB
-
ONT
1 stop17h 27m
JetBlue
Deal found 7/27$850
This Expedia deal was found by Cheapflights users on 7/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/211:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Wed 9/911:30 am
DUB
-
ONT
1 stop17h 27m
JetBlue
Deal found 7/28$851
This Cheapflightsfares deal was found by Cheapflights users on 7/26. 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.
Tue 9/111:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Wed 9/1611:30 am
DUB
-
ONT
1 stop17h 27m
JetBlue
Deal found 7/26$858
This Cheapflightsfares deal was found by Cheapflights users on 7/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Fri 9/411:30 am
DUB
-
ONT
1 stop19h 08m
JetBlue
Deal found 7/28$861
This United Airlines deal was found by Cheapflights users on 7/25. 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.
Tue 9/15:00 am
ONT
-
DUB
2 stops22h 10m
United Airlines
Wed 9/169:20 am
DUB
-
ONT
2 stops40h 51m
United Airlines
Deal found 7/25$862
This Justfly.com deal was found by Cheapflights users on 7/28. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1711:59 pm
ONT
-
DUB
1 stop25h 01m
JetBlue
Wed 9/911:30 am
DUB
-
ONT
1 stop17h 27m
JetBlue
Deal found 7/28$868
This Priceline deal was found by Cheapflights users on 7/27. 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.
Sat 8/2211:13 pm
ONT
-
DUB
1 stop25h 47m
JetBlue
Sat 8/2911:30 am
DUB
-
ONT
1 stop18h 29m
JetBlue
Deal found 7/27$869
This Justfly.com deal was found by Cheapflights users on 7/29. 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.
Sat 8/1511:13 pm
ONT
-
DUB
1 stop25h 47m
JetBlue
Fri 8/2811:30 am
DUB
-
ONT
1 stop19h 08m
JetBlue
Deal found 7/29$870

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 July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$365
(Trip.com)

Popular in

June

Cheapest in

February

Average price

$1,032
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
Highest demand for flights based on searches. 24% potential increase in price ($258 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 29, 2026.
Use the filters below to find and compare flights from Ontario to Dublin that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/11

7:00 am-7:45 am

1 stop16h 45m

Dublin

Sat 11/21

9:40 am-7:41 pm

1 stop18h 01m

$929
Quickest round-trip

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 10/30

12:18 pm-7:45 am

1 stop12h 27m

Dublin

Tue 11/3

9:40 am-7:32 pm

1 stop17h 52m

$929

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 9/23

5:00 am-7:45 am

2 stops18h 45m

Dublin

Wed 10/7

9:20 am-10:49 pm

2 stops21h 29m

$964

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 9/1

7:00 am-9:45 am

1 stop18h 45m

Dublin

Wed 9/16

9:20 am-6:16 pm

2 stops16h 56m

$971

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Thu 8/13

7:00 am-9:45 am

1 stop18h 45m

Dublin

Thu 8/20

9:50 am-10:35 pm

2 stops44h 45m

$983

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sat 8/22

1:56 pm-7:20 am

2 stops33h 24m

Dublin

Sun 9/6

12:30 pm-8:53 pm

2 stops16h 23m

$1,019

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 9/1

11:59 pm-11:05 pm

2 stops63h 06m

Dublin

Tue 9/15

5:35 am-8:13 pm

2 stops46h 38m

$1,023

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 11/11

6:50 am-10:15 am

2 stops19h 25m

Dublin

Sat 11/21

11:30 am-11:04 pm

2 stops19h 34m

$1,029

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Fri 8/14

7:00 am-9:45 am

1 stop18h 45m

Dublin

Sat 8/29

9:50 am-10:35 pm

2 stops20h 45m

$1,056

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 1/10

7:15 am-10:15 am

2 stops19h 00m

Dublin

Wed 1/20

11:30 am-10:39 pm

2 stops19h 09m

$1,074

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice 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.

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 July 29, 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
7.1
Good
11,839 reviews

Crew

7.9

Entertainment

6.8

Overall

7.1

Food

6.4

Comfort

7.2

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.1
Good
11,839 reviews
American Airlines
7.1
Good
11,839 reviews

Crew

7.9

Entertainment

6.8

Overall

7.1

Food

6.4

Comfort

7.2

Boarding

7.5

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

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 $929, JetBlue can have you in Dublin from Ontario in 16h 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 $728.

  • 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.

See more FAQs

Traveling to a place near Dublin?

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

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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 July 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$728Average$1,339FlexibilityNo cancel feeOn-time71%

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