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$399+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DUB
Jul 7 — Jul 141
Mon 7/7
Mon 7/14
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 July 2, 2025.

Round-trip from

$478
(United Airlines)

One-way from

$399
(United Airlines)

Popular in

April

Cheapest in

November

Average price

$975
From Ontario to Dublin
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One-way flight from Ontario to Dublin
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Highest demand for flights based on searches. 5% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 2, 2025.

This United Airlines deal was found by Cheapflights users on 7/2. 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 10/267:00 amONT - DUB
1 stop18h 10mUnited Airlines
Wed 11/59:00 amDUB - ONT
2 stops21h 31mUnited Airlines
Deal found 7/2$478
This Delta deal was found by Cheapflights users on 7/1. 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.
Mon 8/411:40 amONT - DUB
1 stop13h 05mDelta
Wed 8/2011:00 amDUB - ONT
1 stop16h 11mDelta
Deal found 7/1$480
This Iberia deal was found by Cheapflights users on 7/1. 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.
Sun 8/38:15 amONT - DUB
1 stop17h 30mIberia
Tue 8/1912:40 pmDUB - ONT
1 stop18h 08mIberia
Deal found 7/1$489
This American Airlines deal was found by Cheapflights users on 7/1. 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.
Wed 10/2910:57 amONT - DUB
2 stops16h 18mAmerican Airlines
Thu 11/610:00 amDUB - ONT
2 stops19h 41mAmerican Airlines
Deal found 7/1$497
This KLM deal was found by Cheapflights users on 7/1. 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 11/107:00 amONT - DUB
1 stop16h 45mKLM
Mon 11/179:45 amDUB - ONT
1 stop20h 56mKLM
Deal found 7/1$533
This Finnair deal was found by Cheapflights users on 7/1. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2911:59 pmONT - DUB
1 stop24h 16mMultiple Airlines
Thu 11/611:30 amDUB - ONT
2 stops18h 11mMultiple Airlines
Deal found 7/1$544
This Air Canada deal was found by Cheapflights users on 7/2. 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.
Mon 9/16:38 pmONT - DUB
2 stops29h 37mAir Canada
Sun 9/79:20 amDUB - ONT
2 stops43h 13mAir Canada
Deal found 7/2$585

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 2, 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

Sun 10/26

7:00 am-8:10 am

1 stop18h 10m

Dublin

Wed 11/5

9:00 am-10:31 pm

2 stops21h 31m

$478

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 8/4

11:40 am-8:45 am

1 stop13h 05m

Dublin

Wed 8/20

11:00 am-7:11 pm

1 stop16h 11m

$480

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Sun 8/3

8:15 am-9:45 am

1 stop17h 30m

Dublin

Tue 8/19

12:40 pm-10:48 pm

1 stop18h 08m

$489

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

10:57 am-10:15 am

2 stops16h 18m

Dublin

Thu 11/6

10:00 am-9:41 pm

2 stops19h 41m

$497

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 11/10

7:00 am-7:45 am

1 stop16h 45m

Dublin

Mon 11/17

9:45 am-10:41 pm

1 stop20h 56m

$533

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 10/29

11:59 pm-7:15 am

1 stop24h 16m

Dublin

Thu 11/6

11:30 am-9:41 pm

2 stops18h 11m

$544

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 9/1

6:38 pm-8:15 am

2 stops29h 37m

Dublin

Sun 9/7

9:20 am-8:33 pm

2 stops43h 13m

$585

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Tue 8/26

7:00 am-7:20 am

2 stops16h 20m

$399

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Mon 12/1

7:00 am-7:45 am

1 stop16h 45m

$418

OntarioDublin

ONT - DUB

ONTDUB

Ontario

Wed 8/13

12:47 pm-9:45 am

1 stop12h 58m

$419

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 16 results
1
2

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 $509). Flying from Ontario to Dublin in June is currently the most expensive (average of $929). 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 July 2, 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 morning tend to be the most expensive. A flight at noon could potentially save you up to 6% on airfare.

How much does it cost to fly round-trip from Ontario to Dublin?

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 2, 2025.
Peruse reviews from past customers who have flown with Delta, KLM, and United 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.
Delta
8.0
Very good
7,983 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
7,983 reviews
Delta
8.0
Very good
7,983 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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.
KLM
7.8
Good
1,366 reviews
Delta
8.0
Very good
7,983 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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.
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,983 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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.
JetBlue
7.3
Good
2,918 reviews
Delta
8.0
Very good
7,983 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
10,000 reviews
Delta
8.0
Very good
7,983 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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.

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

    Cheapflights users have booked flights from Ontario to Dublin round-trip from $478. Other airlines that can offer you cheap pricing are Delta, from $480, and Iberia, from $489. Users have found that United Airlines is 36% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Ontario to Dublin one-way?

    One-way options have recently been found by users for as low as $399 on United Airlines. Other airlines that offer cheap prices include KLM from $418 and Iberia from $419 one-way.

  • 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 $509). Flying from Ontario to Dublin in June is currently the most expensive (average of $929). 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 Ontario?

Book flights to Ontario 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 July 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$527Average$851FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$547Average$786FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$596Average$956FlexibilityNo cancel feeOn-time71%

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