$696 Find Cheap Flights from Greece to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 6/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

Cheap Flight Deals from Greece to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Greece to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Greece to Ontario

KAYAK's recommended round-trip deals from the most popular airlines that fly from Greece to Ontario.
Discover the best prices for you by selecting your travel dates on KAYAK.
Delta Logo
9:10 am - 7:33 pmATH-ONT
20h 23m1 stop
Delta Logo
7:05 am - 10:00 amONT-ATH
16h 55m1 stop
$1,047Delta
Find Deal
Sun, May 18 - Sat, May 31
KLM Logo
9:10 am - 10:25 pmATH-ONT
23h 15m1 stop
KLM Logo
7:05 am - 10:55 amONT-ATH
17h 50m1 stop
$1,368KLM
Find Deal
Fri, Jun 20 - Fri, Jul 4
KLM Logo
9:10 am - 10:29 pmATH-ONT
23h 19m1 stop
KLM Logo
7:05 am - 10:10 amONT-ATH
17h 05m1 stop
$1,913KLM
Find Deal
Fri, Jun 6 - Sat, Jun 21
KLM Logo
9:10 am - 10:27 pmATH-ONT
23h 17m1 stop
KLM Logo
7:05 am - 10:55 amONT-ATH
17h 50m1 stop
$2,109KLM
Find Deal
Sun, Jul 13 - Wed, Jul 23
Qatar Airways Logo
8:00 pm - 1:50 pmATH-ONT
27h 50m2 stops
Qatar Airways Logo
2:40 pm - 7:00 amONT-ATH
30h 20m2 stops
$3,759Qatar Airways
Find Deal
Fri, Jun 6 - Sat, Jun 21
Qatar Airways Logo
8:00 pm - 1:41 pmATH-ONT
27h 41m2 stops
Qatar Airways Logo
2:34 pm - 7:00 amONT-ATH
30h 26m2 stops
$3,906Qatar Airways
Find Deal
Sun, Jul 13 - Wed, Jul 23
United Airlines Logo
12:35 pm - 10:26 pmATH-ONT
19h 51m1 stop
United Airlines Logo
7:00 am - 10:30 amONT-ATH
17h 30m1 stop
$8,929United Airlines
Find Deal
Sun, Jun 1 - Tue, Jun 10
Useful Info

KAYAK's insights & trends for flights to Ontario

Get data-powered insights and trends for flights to Ontario to help you find the cheapest flights, the best time to fly and much more.

How long is the flight to Ontario?

The duration of your flight to Ontario depends on your departure and arrival airports. Obviously, any flights that include a layover will also be longer. The most popular routes to Ontario on KAYAK are from Athens, which takes 13h 30m, and Thessaloniki, which takes 25h 40m.

How many direct flights to Ontario are there each day?

There are around 90 direct flights from within Greece to Ontario every day. Most flights depart in the morning, with 7:00 am the most common departure time and 48% of flights departing in the morning.

Find deals

Good to know

Cheapest flight$696
Flight from Athens to Ontario

FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    The city center of Ontario is 3 miles from Ontario Airport.

  • What is the name of Ontario’s airport?

    When flying to Ontario, you'll arrive at Ontario Airport (ONT). The airport is also known as Ontario or Ontario Intl.

  • How does KAYAK find such low prices on flights to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to Ontario are there each week?

    Each week there are around 630 direct flights from within Greece to Ontario. The most common day for departures is Sunday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to Ontario

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.

Top airline flying from Greece to Ontario

 
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Greece to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8702 reviews
7.3Comfort
7.1Entertainment
7.7Boarding
8.1Crew
6.6Food
Airline reviews

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

10.0 ExcellentMohammad Hassan Mirzai, May 2025HKG - SFO
Read more United Airlines reviews

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

A bit rush for transit. Food and entertainment are not available

Wonderful and fast TSA checkpoint. The line was fast and our gate was close by

The gate was too far away for the connecting flight

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

headphone jack didnt work for the first flight and not much variety

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

For the most part united was a good experience, how ever when they came by with the snacks and water, they completely passed by my wife and I. As we were in separate rows. On a 5 hr flight we were not offered water

Fantastic crew. Flight was delayed at last minute but we were given updates every 20 minutes and the crew was so friendly and considerate. I miss the touch screens on the back of the seats, wish they would bring that back though.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.