EUR/IE
Find cheap flights to Ontario, California in 2026/2027 from €422 This is the cheapest return flight found to Ontario, California from Ireland on FlightsFinder on January 25th 2026 at 17:59. This offer may no longer be available. Click the offer to check live prices & dates of travel.
Our Flight Finder compares the cheapest flights to Ontario, California from the most established flight comparison sites.
Fly to Ontario, California and visit sites like Planes of Fame Air Museum, Cucamonga-Guasti Regional Park, Jurupa Mountains Discovery Center & Yanks Air Museum.
1. Enter your search requirements for Ontario, California
2. Compare the best Ontario, California deals from top comparison engines
3. Book your Ontario, California flight at the cheapest price
These economy flights were found on FlightsFinder from Ireland to Ontario, California in the last few days. Prices subject to availability.
These economy flights were found on FlightsFinder from Ireland to Ontario, California in the last few days. Prices subject to availability.
According to our data, November is on average the cheapest time to book flights to Ontario, California.
You can get flights from €422 return.
According to our data, July is on average the most expensive time to book flights to Ontario, California.
A return flight could set you back more than €766.
Located in Southern California, Ontario is a vibrant city known for its diverse culture, rich history, and flourishing economy. With its proximity to major attractions such as the Ontario Mills shopping mall and the Toyota Arena, Ontario offers a perfect blend of urban excitement and natural beauty. The city boasts a range of outdoor recreational activities, including hiking in the nearby Mount Baldy and exploring the picturesque Cucamonga Wilderness. Whether you're a food enthusiast, outdoor adventurer, or history buff, Ontario has something to offer everyone, making it a truly dynamic destination worth exploring.
A good price for a flight to Ontario is €380 - €464.
Popular airports near Ontario, California include Ontario International Airport (ONT), Los Angeles International Airport (LAX), and John Wayne Airport (SNA).
The flight to Ontario, California (ONT) is roughly 11 hours 54 minutes and 5,136 miles (8,265 kilometres) from Dublin, Ireland - Dublin International Airport (DUB).
The best way is to compare flights to Ontario, California from leading comparison sites using our search engine dashboard.
We have currently found no direct flights to Ontario, California.
Here is the average weather forecast in Ontario, California by month:
• Jan: 18°C
• Feb: 19°C
• Mar: 21°C
• Apr: 23°C
• May: 26°C
• Jun: 30°C
• Jul: 33°C
• Aug: 34°C
• Sep: 32°C
• Oct: 27°C
• Nov: 23°C
• Dec: 19°C
The main airport in Ontario, California is approximately 3 miles from the city center.
Typically, flights are cheapest to Ontario, California 2 months before departure.
Studies show flights to Ontario, California are typically cheaper on Tuesdays and Wednesdays.
15 °C
Thu, 29 Jan 2026
Average Temperature
18°C
Jan
19°C
Feb
21°C
Mar
23°C
Apr
26°C
May
30°C
Jun
33°C
Jul
34°C
Aug
32°C
Sep
27°C
Oct
23°C
Nov
19°C
Dec
Dublin, Ireland - Dublin International Airport (DUB) to Ontario, California (ONT)
Distance:
5,136 miles (8,265 kilometres)
Average flight time (direct 11 hours 54 minutes)
Shannon, Ireland - Shannon International Airport (SNN) to Ontario, California (ONT)
Distance:
5,075 miles (8,168 kilometres)
Average flight time (direct 11 hours 46 minutes)
Knock, Ireland - Ireland West Airport (NOC) to Ontario, California (ONT)
Distance:
5,031 miles (8,097 kilometres)
Average flight time (direct 11 hours 40 minutes)
Cork, Ireland - Cork International Airport (ORK) to Ontario, California (ONT)
Distance:
5,125 miles (8,248 kilometres)
Average flight time (direct 11 hours 53 minutes)
Kerry, Ireland - Kerry Airport (KIR) to Ontario, California (ONT)
Distance:
5,075 miles (8,168 kilometres)
Average flight time (direct 11 hours 46 minutes)
Donegal, Ireland - Donegal Airport (CFN) to Ontario, California (ONT)
Distance:
5,002 miles (8,050 kilometres)
Average flight time (direct 11 hours 36 minutes)
Waterford, Ireland - Waterford Airport (WAT) to Ontario, California (ONT)
Distance:
5,159 miles (8,303 kilometres)
Average flight time (direct 11 hours 57 minutes)
From Dublin (DUB), Ireland to Ontario, United States (ONT): €422
Depart: 06 Nov 2026 · Return: 13 Nov 2026 Price found 25 Jan 2026, 17:59
From Cork (ORK), Ireland to Ontario, United States (ONT): €556
Depart: 19 Feb 2026 · Return: 26 Feb 2026 Price found 28 Jan 2026, 17:44
From Shannon (SNN), Ireland to Ontario, United States (ONT): €955
Depart: 09 Jul 2026 · Return: 13 Jul 2026 Price found 28 Jan 2026, 21:04
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