$711 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 9/8. 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

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
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Flight Deals

Cheap Flights 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Greece to Ontario

Wed, Jan 14 - Wed, Jan 28
United Airlines Logo
6:15 am - 8:17 pmATH-ONT
24h 02m2 stops
United Airlines Logo
10:40 am - 4:35 pmONT-ATH
19h 55m2 stops
$843United Airlines
Find Deal
Wed, Jan 21 - Fri, Jan 30
United Airlines Logo
6:15 am - 6:00 pmATH-ONT
21h 45m2 stops
United Airlines Logo
10:40 am - 4:35 pmONT-ATH
19h 55m2 stops
$844United Airlines
Find Deal
Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
12:50 pm - 10:45 pmATH-ONT
19h 55m2 stops
United Airlines Logo
5:05 am - 11:35 amONT-ATH
20h 30m2 stops
$852United Airlines
Find Deal
Wed, Aug 20 - Fri, Aug 29
American Airlines Logo
12:00 pm - 9:10 pmATH-ONT
19h 10m1 stop
American Airlines Logo
11:59 pm - 12:05 pmONT-ATH
26h 06m1 stop
$914American Airlines
Find Deal
Fri, Sep 19 - Sun, Oct 5
Delta Logo
12:10 pm - 10:23 pmATH-ONT
20h 13m1 stop
Delta Logo
10:00 pm - 10:55 amONT-ATH
26h 55m1 stop
$944Delta
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Fri, Sep 5 - Sat, Sep 20
Delta Logo
9:10 am - 7:11 pmATH-ONT
20h 01m1 stop
Delta Logo
7:05 am - 10:55 amONT-ATH
17h 50m1 stop
$945Delta
Find Deal
Tue, Sep 23 - Mon, Oct 6
Air Serbia Logo
4:20 am - 9:29 pmATH-ONT
27h 09m2 stops
Air Serbia Logo
10:56 pm - 2:55 pmONT-ATH
29h 59m2 stops
$1,088Air Serbia
Find Deal
Wed, Sep 17 - Sun, Oct 5
Air Serbia Logo
4:20 am - 9:29 pmATH-ONT
27h 09m2 stops
Air Serbia Logo
10:56 pm - 3:40 pmONT-ATH
30h 44m2 stops
$1,127Air Serbia
Find Deal
Sat, Sep 20 - Tue, Oct 7
KLM Logo
10:30 am - 7:15 pmATH-ONT
18h 45m1 stop
KLM Logo
7:05 am - 10:55 amONT-ATH
17h 50m1 stop
$1,278KLM
Find Deal
Sat, Sep 20 - Tue, Oct 7
KLM Logo
10:30 am - 7:15 pmATH-ONT
18h 45m1 stop
KLM Logo
7:05 am - 10:55 amONT-ATH
17h 50m1 stop
$1,340KLM
Find Deal
Booking Insights

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 20h 02m.

How many direct flights to Ontario are there each day?

There are around 89 direct flights from within Greece to Ontario every day. Most flights depart in the morning, with 8:00 am the most common departure time and 45% of flights departing in the morning.

Good to know

Cheapest flight$711
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 619 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.

Reviews of the 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 8917 reviews
7.0Entertainment
7.7Boarding
8.1Crew
7.3Comfort
6.6Food
Airline reviews

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

2.0 MediocreGeorge, Aug 2025HNL - SFO
Read more United Airlines reviews

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

I found the staff to not be very attentive at all. When paying for Business Class you expect a certain type of service and that was not found. They were almost rude even

Ok. Get a different kosher caterer. The food was odd.

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

I really enjoyed flying with United airlines amazing experience , good customer service and great food

1.It will be better if sandwich is warm. 2.The food is too salty. 3.Breakfast needs some vegetables or fruits.

Boarded plane and then delayed 1.5 hours while on the plane

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

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