ATH - ONT

$586 Find Cheap Flights from Athens 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 from Athens to Ontario departing on 11/20. 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 in flight searches from Athens to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Athens to Ontario, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Athens to Ontario (ATH-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Athens 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 Athens to Ontario

Mon, Oct 27 - Wed, Nov 5
American Airlines Logo
8:10 pm - 4:28 pmATH-ONT
29h 18m2 stops
American Airlines Logo
9:59 am - 1:05 amONT-ATH
29h 06m2 stops
$830American Airlines
Find Deal
Thu, Dec 11 - Sat, Jan 10
United Airlines Logo
6:25 am - 8:42 pmATH-ONT
24h 17m2 stops
United Airlines Logo
1:20 pm - 4:35 pmONT-ATH
17h 15m2 stops
$832United Airlines
Find Deal
Tue, Oct 28 - Wed, Nov 5
United Airlines Logo
7:05 am - 12:37 pmATH-ONT
38h 32m2 stops
United Airlines Logo
5:05 am - 10:05 amONT-ATH
19h 00m2 stops
$833United Airlines
Find Deal
Fri, Oct 31 - Mon, Nov 3
American Airlines Logo
12:50 pm - 1:43 pmATH-ONT
33h 53m2 stops
American Airlines Logo
10:47 am - 3:50 pmONT-ATH
19h 03m2 stops
$927American Airlines
Find Deal
Thu, Oct 2 - Tue, Oct 21
KLM Logo
10:30 am - 7:15 pmATH-ONT
18h 45m1 stop
KLM Logo
7:05 am - 10:55 amONT-ATH
17h 50m1 stop
$1,142KLM
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Wed, Oct 29 - Tue, Nov 4
Qatar Airways Logo
12:40 pm - 11:32 pmATH-ONT
43h 52m2 stops
Qatar Airways Logo
6:00 am - 11:10 amONT-ATH
43h 10m2 stops
$1,157Qatar Airways
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Wed, Oct 29 - Fri, Nov 7
Qatar Airways Logo
12:40 pm - 11:32 pmATH-ONT
43h 52m2 stops
Qatar Airways Logo
6:00 am - 11:10 amONT-ATH
43h 10m2 stops
$1,187Qatar Airways
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Sun, Nov 9 - Tue, Nov 25
British Airways Logo
8:00 am - 9:59 pmATH-ONT
23h 59m2 stops
British Airways Logo
6:10 am - 7:30 pmONT-ATH
27h 20m2 stops
$1,237British Airways
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Wed, Oct 1 - Sun, Oct 5
KLM Logo
10:15 am - 10:23 pmATH-ONT
22h 08m1 stop
KLM Logo
10:00 pm - 10:55 amONT-ATH
26h 55m1 stop
$1,311KLM
Find Deal
Thu, Oct 2 - Tue, Oct 21
British Airways Logo
7:55 am - 6:54 pmATH-ONT
20h 59m2 stops
British Airways Logo
12:47 pm - 6:05 pmONT-ATH
19h 18m2 stops
$1,911British Airways
Find Deal

Everything you should know

Top airlines
American Airlines
Cheapest • from $830 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$830
American Airlines
Mon 10/27Wed 11/5
ATH - ONT • 2 stops
Cheapest one-way
$586
British Airways
Thu 11/20
ATH - ONT • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Booking Insights

KAYAK's insights & trends for Athens to Ontario flights

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

Which airlines provide the cheapest flights from Athens to Ontario?

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 Athens to Ontario were found on American Airlines ($830) and United Airlines ($832).

Good to know

Cheapest flight$586
Flight from Athens to Ontario

When to book flights from Athens to Ontario

Are your dates flexible? Find out the best times to travel from Athens to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Athens to Ontario

  • What is the cheapest flight from Athens to Ontario?

    In the last 3 days, the lowest price for a flight from Athens to Ontario was $586 for a one-way ticket and $830 for a round-trip.

  • Do I need a passport to fly between Athens and Ontario?

    A passport is required to fly from Athens to Ontario.

  • Which aircraft models fly most regularly from Athens to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Athens to Ontario?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Athens and Ontario, with oneworld being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from Athens 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 from Athens to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Athens 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 Athens 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 to Athens with another airline. Booking your flights between Athens and ONT can sometimes prove cheaper using this method.

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

 
See real verified KAYAK customer reviews for airlines flying from Athens to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Athens 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 8929 reviews
7.7Boarding
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
Airline reviews

The flight was comfortable with the exit row and great service

10.0 ExcellentMark, Aug 2025HNL - LAX
Read more United Airlines reviews

The flight was comfortable with the exit row and great service

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

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

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

Information on your arrival and departure airports

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