$268 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 7/19. 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$610
Thera
Thera2 stops$809
Athens
Athens2 stops$610
Thera
Thera2 stops$809

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

Wed, May 13 - Mon, May 25
British Airways Logo
10:59 am - 2:25 am
ONT
-
ATH
29h 26m
2 stops
British Airways Logo
7:30 pm - 9:57 pm
ATH
-
ONT
36h 27m
2 stops
$610British Airways
Tue, May 12 - Tue, May 26
British Airways Logo
4:52 pm - 2:10 am
ONT
-
ATH
23h 18m
2 stops
British Airways Logo
8:00 pm - 9:57 pm
ATH
-
ONT
35h 57m
2 stops
$611British Airways
Wed, May 6 - Thu, May 21
United Airlines Logo
1:30 pm - 11:05 pm
ONT
-
ATH
23h 35m
2 stops
United Airlines Logo
1:10 pm - 10:28 pm
ATH
-
ONT
43h 18m
2 stops
$617United Airlines
Mon, Mar 30 - Wed, Apr 8
British Airways Logo
5:02 pm - 1:10 pm
ONT
-
ATH
34h 08m
2 stops
British Airways Logo
7:30 am - 11:46 pm
ATH
-
ONT
26h 16m
2 stops
$618British Airways
Tue, Apr 7 - Tue, Apr 21
British Airways Logo
10:59 am - 7:05 pm
ONT
-
ATH
22h 06m
2 stops
British Airways Logo
8:00 pm - 4:22 pm
ATH
-
ONT
30h 22m
2 stops
$619British Airways
Wed, May 6 - Thu, May 21
United Airlines Logo
1:30 pm - 11:05 pm
ONT
-
ATH
23h 35m
2 stops
United Airlines Logo
12:35 pm - 10:28 pm
ATH
-
ONT
19h 53m
1 stop
$632United Airlines
Thu, Mar 5 - Sun, Mar 8
United Airlines Logo
1:40 pm - 12:30 am
ONT
-
ATH
24h 50m
2 stops
United Airlines Logo
11:25 am - 9:36 pm
ATH
-
ONT
44h 11m
2 stops
$641United Airlines
Mon, Jun 1 - Thu, Jul 2
Air Serbia Logo
11:25 pm - 3:25 pm
ONT
-
SKG
30h 00m
2 stops
Air Serbia Logo
4:10 pm - 10:40 pm
SKG
-
ONT
40h 30m
2 stops
$1,203Air Serbia
Mon, Jun 1 - Thu, Jul 2
Air Serbia Logo
11:25 pm - 3:25 pm
ONT
-
SKG
30h 00m
2 stops
Air Serbia Logo
4:10 pm - 10:40 pm
SKG
-
ONT
40h 30m
2 stops
$1,326Air Serbia
Sun, Jun 28 - Sun, Jul 5
Air Serbia Logo
11:25 pm - 3:25 pm
ONT
-
SKG
30h 00m
2 stops
Air Serbia Logo
4:10 pm - 10:09 pm
SKG
-
ONT
39h 59m
2 stops
$1,602Air Serbia
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 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 United Airlines ($693) and British Airways ($785).

Good to know

Low seasonFebruary
Cheapest flight$268
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly with an average 70% 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.

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 9283 reviews
8.1Crew
7.3Comfort
7.1Entertainment
6.6Food
7.7Boarding
Airline reviews

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

8.0 ExcellentDarly, Feb 2026
LAX - ORD
Read more United Airlines reviews

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Terrible. No customer service, no food, no drinks on a 6 hour premier economy booking.

Check-in and in-flight staff were better than average. The seat was a fair size but too hard and not enough padding. The cushion/pillow provided is poor (thin and seems to be disposable ,it provides no effective cushioning or support). Food was OK-ish but no choice of inflight snacks and no easy place to get drinks other than water (I could ask for juice by intruding into the staff area at the back of the plane) Entertainment was very good actually. Overall better than I expected from a US-based airline (sorry!) but compared to ANA or Singapore it was so-so. (I live in Japan so they are my comparative airlines)

Terrible. Our first time back on United for 10 years, the seats in Polaris class are small and uncomfortable. They have squished too many people in to get more $$$. The staff are not friendly and not wanting to accommodate. I asked for two salads rather than a main meal and was advised no we wont do that. Then asked what I would like for breakfast and given something else anyway. I will not be flying United International anytime soon.

The food was terrible this time. Otherwise pleasant, quiet, on-time.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

The flight crew where really good. Better then the crew from BNE to SFO

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

left on time, reasonable boarding process arrived early luggage came out quickly

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

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