$405 Cheap Flights from Ontario (ONT) to Dublin (DUB)

View $405 flight on Mon, Oct 6, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Ontario to Dublin (ONT-DUB)

Prices were available within the past 7 days and start at $405 for one-way flights and $552 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Iberia
Mon, Apr 28 - Tue, May 13
ONT
Ontario
DUB
Dublin
$552 Roundtrip, found 2 days ago
$552
Roundtrip
found 2 days ago
Select Iberia flight, departing Mon, Apr 28 from Ontario to Dublin, returning Tue, May 13, priced at $552 found 2 days ago
American Airlines
Wed, Sep 17 - Wed, Sep 24
ONT
Ontario
DUB
Dublin
$556 Roundtrip, found 1 day ago
$556
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Sep 17 from Ontario to Dublin, returning Wed, Sep 24, priced at $556 found 1 day ago
Iberia
Mon, Apr 28 - Tue, May 13
ONT
Ontario
DUB
Dublin
$557 Roundtrip, found 2 days ago
$557
Roundtrip
found 2 days ago
Select Iberia flight, departing Mon, Apr 28 from Ontario to Dublin, returning Tue, May 13, priced at $557 found 2 days ago
Iberia
Sun, Apr 27 - Tue, May 13
ONT
Ontario
DUB
Dublin
$563 Roundtrip, found 4 days ago
$563
Roundtrip
found 4 days ago
Select Iberia flight, departing Sun, Apr 27 from Ontario to Dublin, returning Tue, May 13, priced at $563 found 4 days ago
Delta
Mon, Sep 15 - Tue, Sep 23
ONT
Ontario
DUB
Dublin
$578 Roundtrip, found 2 days ago
$578
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Sep 15 from Ontario to Dublin, returning Tue, Sep 23, priced at $578 found 2 days ago
Delta
Sun, Sep 14 - Wed, Sep 24
ONT
Ontario
DUB
Dublin
$582 Roundtrip, found 2 days ago
$582
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Sep 14 from Ontario to Dublin, returning Wed, Sep 24, priced at $582 found 2 days ago
Delta
Sun, Sep 14 - Tue, Sep 23
ONT
Ontario
DUB
Dublin
$583 Roundtrip, found 2 days ago
$583
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Sep 14 from Ontario to Dublin, returning Tue, Sep 23, priced at $583 found 2 days ago
Delta
Tue, Jul 8 - Fri, Jul 18
ONT
Ontario
DUB
Dublin
$588 Roundtrip, found 4 days ago
$588
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Jul 8 from Ontario to Dublin, returning Fri, Jul 18, priced at $588 found 4 days ago
British Airways
Wed, Sep 24 - Mon, Oct 6
ONT
Ontario
DUB
Dublin
$594 Roundtrip, found 5 days ago
$594
Roundtrip
found 5 days ago
Select British Airways flight, departing Wed, Sep 24 from Ontario to Dublin, returning Mon, Oct 6, priced at $594 found 5 days ago
Air Canada
Mon, Aug 11 - Fri, Aug 22
ONT
Ontario
DUB
Dublin
$684 Roundtrip, found 1 day ago
$684
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Aug 11 from Ontario to Dublin, returning Fri, Aug 22, priced at $684 found 1 day ago

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB) cost?
Discover the latest flight deals from ONT to DUB by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ONT to DUB?
The cheapest flights from ONT to DUB are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB)?
You can’t catch a nonstop flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Dublin Airport (DUB). However, you can easily travel to Dublin without any layovers by leaving from Los Angeles Intl. Airport (LAX).
What is the cheapest airline that flies from ONT to DUB?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from ONT to DUB. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB)?
There aren’t any daily nonstop flights departing from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you’ll be soaring above the clouds in no time at all.
What day of the week has the most flights from ONT to DUB?
Usually you’ll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB)?
To land at Dublin Airport (DUB) on time, select a flight that leaves Los Angeles - Ontario Intl. Airport (ONT) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB) last-minute?
Holding off until just before your departure to book a flight from ONT to DUB generally means paying more. While you may find some last-minute discounts, there’s no guarantee. Be flexible with your itinerary for a better chance of getting a bargain.
Is it cheaper to book an ONT to DUB flight and hotel package?
Compared with arranging flights and hotels separately, booking an ONT to DUB flight and hotel package with Expedia could lead to significant savings. What’s more, having it all in one place will take the stress out of travel planning. Simply secure your flights and select from our wide range of hotels, then personalize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Dublin Airport (DUB)?
In most cases, you can cancel or reschedule your ONT to DUB flight. However, there may be additional charges, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline’s guidelines and fees on flight changes, or if you need more information, go to our Customer Service portal.
*Available to One Key members.