$256 Find Cheap Flights from Ontario to Greece

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Greece departing on 3/25. 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
1 adult, Economy, 0 bags

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Cheap Flights from Ontario to Greece

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Athens
Athens2 stops$481
Thera
Thera2 stops$1,014
Athens
Athens2 stops$481
Thera
Thera2 stops$1,014

Book Cheap Ontario to Greece Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Greece 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Greece

Sat, Mar 7 - Sat, Mar 14
United Airlines Logo
6:00 am - 1:40 am
ONT
-
ATH
33h 40m2 stops
United Airlines Logo
12:15 pm - 10:25 pm
ATH
-
ONT
43h 10m2 stops
$481United Airlines
Sat, Jan 24 - Sat, Jan 31
British Airways Logo
4:45 pm - 1:25 am
ONT
-
ATH
22h 40m2 stops
British Airways Logo
8:05 pm - 10:13 pm
ATH
-
ONT
36h 08m2 stops
$491British Airways
Sat, Jan 24 - Mon, Feb 9
Lufthansa Logo
1:53 pm - 1:40 am
ONT
-
ATH
25h 47m2 stops
Lufthansa Logo
2:15 pm - 10:53 pm
ATH
-
ONT
18h 38m2 stops
$493Lufthansa
Fri, Feb 6 - Mon, Feb 16
United Airlines Logo
6:39 pm - 1:40 am
ONT
-
ATH
21h 01m2 stops
United Airlines Logo
6:25 am - 12:48 pm
ATH
-
ONT
40h 23m2 stops
$502United Airlines
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
1:53 pm - 4:35 pm
ONT
-
ATH
40h 42m2 stops
United Airlines Logo
6:35 am - 12:47 pm
ATH
-
ONT
40h 12m2 stops
$515United Airlines
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
6:39 pm - 4:35 pm
ONT
-
ATH
35h 56m2 stops
United Airlines Logo
6:35 am - 8:58 pm
ATH
-
ONT
24h 23m2 stops
$516United Airlines
Sat, Mar 21 - Fri, Apr 3
KLM Logo
1:20 pm - 1:15 am
ONT
-
ATH
26h 55m2 stops
KLM Logo
9:10 am - 9:04 pm
ATH
-
ONT
21h 54m1 stop
$563KLM
Sun, Mar 29 - Fri, Apr 3
KLM Logo
10:25 pm - 11:00 am
ONT
-
ATH
26h 35m1 stop
KLM Logo
9:10 am - 9:04 pm
ATH
-
ONT
21h 54m1 stop
$586KLM
Sat, Apr 18 - Sat, Apr 25
Multiple Airlines Logo
6:00 am - 10:45 pm
ONT
-
SKG
30h 45m2 stops
Multiple Airlines Logo
9:05 pm - 9:56 am
SKG
-
ONT
46h 51m2 stops
$886Multiple Airlines
Sat, Apr 18 - Sat, Apr 25
Multiple Airlines Logo
6:00 am - 10:45 pm
ONT
-
SKG
30h 45m2 stops
Multiple Airlines Logo
1:25 pm - 8:36 pm
SKG
-
ONT
41h 11m3 stops
$1,037Multiple Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Greece flights

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

Which airlines fly non-stop between Ontario and Greece?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Ontario to Greece.

There is just one airline that flies from Ontario to Greece direct and that is United Airlines. The best round-trip deal found from United Airlines for the route is to Athens (ATH) and costs $660.

Which airlines provide the cheapest flights from Ontario to Greece?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Ontario to Greece were found on British Airways ($491) and United Airlines ($515).

Good to know

Low seasonFebruary
Cheapest flight$256
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly with an average 62% increase in price.
Flight from Ontario to Athens

FAQs - booking Greece flights

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

    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 from Ontario to Greece.

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

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

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

    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 from Ontario to Greece 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 from Ontario to Greece?

    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 from Ontario to Greece up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Greece?

    The cheapest time of day to fly to Greece is generally in the evening, when round-trip flights cost $815 on average. Morning departures are around 13% more expensive than evening flights, on average. The most expensive time of day to fly to Greece is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,089.

Reviews of the top airline flying from Ontario to Greece

 
Need help choosing which airline to fly with from Ontario to Greece? 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 9115 reviews
8.1Crew
7.3Comfort
7.1Entertainment
6.6Food
7.7Boarding
Airline reviews

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

10.0 ExcellentAnonymous, Dec 2025
SFO - BOS
Read more United Airlines reviews

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

We were in business class. the angled seats in that class do not have a real window view & the placement of the controls are bad. But we knew that. But the food options were mediocre. The taste was fine, but the size was for a child. It’s just really feels like United is skimping on everything. Even when we were in the Polaris lounge they did not have diet sodas. They said they were out no Coke zero no Diet Coke, etc. I do not think the portion of nuts they serve on the plane could get any smaller. Really a minimal service and offer for what you’re paying for in business.

Everything you need to know for your flight from Ontario to Greece

Information on your arrival and departure airports