ATH - ONT

$483 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 6/2. 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

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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Everything you should know

Cheapest round-trip
$961
American Airlines
Thu 4/16Wed 4/22
ATH - ONT • 2 stops
Cheapest one-way
$483
Multiple Airlines
Tue 6/2
ATH - ONT • 1 stop
Top airlines
American Airlines
Cheapest • from $961 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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!
Flight Deals
Booking Insights
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

Thu, Apr 16 - Wed, Apr 22
American Airlines Logo
10:45 am - 11:46 pm
ATH
-
ONT
23h 01m
2 stops
American Airlines Logo
7:30 am - 2:20 pm
ONT
-
ATH
20h 50m
2 stops
$961American Airlines
Thu, Apr 16 - Wed, Apr 22
Multiple Airlines Logo
9:10 am - 9:00 pm
ATH
-
ONT
21h 50m
1 stop
Multiple Airlines Logo
10:15 pm - 11:00 am
ONT
-
ATH
26h 45m
1 stop
$989Multiple Airlines
Mon, Mar 2 - Mon, Mar 16
KLM Logo
5:20 pm - 9:05 pm
ATH
-
ONT
37h 45m
2 stops
KLM Logo
1:20 pm - 1:15 am
ONT
-
ATH
26h 55m
2 stops
$991KLM
Thu, Apr 16 - Wed, Apr 22
KLM Logo
6:00 am - 5:15 pm
ATH
-
ONT
21h 15m
2 stops
KLM Logo
10:15 pm - 11:00 am
ONT
-
ATH
26h 45m
1 stop
$997KLM
Wed, May 20 - Sun, May 31
Delta Logo
9:10 am - 6:36 pm
ATH
-
ONT
19h 26m
1 stop
Delta Logo
11:04 pm - 11:00 am
ONT
-
ATH
25h 56m
1 stop
$1,014Delta
Tue, Mar 3 - Tue, Mar 10
British Airways Logo
7:55 pm - 10:19 pm
ATH
-
ONT
36h 24m
2 stops
British Airways Logo
3:19 pm - 7:30 pm
ONT
-
ATH
19h 11m
2 stops
$1,043British Airways
Fri, May 22 - Sun, May 31
Iberia Logo
2:00 pm - 11:59 pm
ATH
-
ONT
19h 59m
1 stop
Iberia Logo
7:20 am - 11:45 am
ONT
-
ATH
18h 25m
1 stop
$1,167Iberia
Wed, Jul 15 - Fri, Jul 24
KLM Logo
6:00 am - 5:16 pm
ATH
-
ONT
21h 16m
2 stops
KLM Logo
12:00 pm - 10:00 am
ONT
-
ATH
36h 00m
1 stop
$1,188KLM
Sun, Apr 5 - Mon, Apr 13
KLM Logo
1:35 pm - 11:51 pm
ATH
-
ONT
20h 16m
2 stops
KLM Logo
7:05 am - 11:00 am
ONT
-
ATH
17h 55m
1 stop
$1,199KLM
Mon, Apr 27 - Sun, May 3
KLM Logo
9:10 am - 6:33 pm
ATH
-
ONT
19h 23m
1 stop
KLM Logo
7:05 am - 11:00 am
ONT
-
ATH
17h 55m
1 stop
$1,268KLM
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 ($961) and KLM ($991).

Good to know

Cheapest flight$483
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 $483 for a one-way ticket and $961 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?

    Star Alliance is the only airline alliance operating flights between Athens and Ontario.

  • 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 9222 reviews
6.6Food
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

Very poor. The flight was delayed from Toronto because some forget to do there job . I got to my connecting gate in San Francisco 10 minutes before the departure.but this didn’t let me board even though the flight was still there for an other 30 minutes. The the gentleman at the unite airline desk told me that they usually wait for passengers but air Canada called and told them not to we I been rerouted to Manila instead of Hong Kong . In San Francisco they mad me check in my carryon bag . I was told the it will directly go yo ho chi minn cuyt but I was told that by the Vietnams airline desk that’s not there I’m 10 hours behind my scheduled flight and looks like I I’m going without baggage. I don’t have a chance of catching ..

2.0 MediocreAnonymous, Feb 2026
YYZ - SFO
Read more United Airlines reviews

Very poor. The flight was delayed from Toronto because some forget to do there job . I got to my connecting gate in San Francisco 10 minutes before the departure.but this didn’t let me board even though the flight was still there for an other 30 minutes. The the gentleman at the unite airline desk told me that they usually wait for passengers but air Canada called and told them not to we I been rerouted to Manila instead of Hong Kong . In San Francisco they mad me check in my carryon bag . I was told the it will directly go yo ho chi minn cuyt but I was told that by the Vietnams airline desk that’s not there I’m 10 hours behind my scheduled flight and looks like I I’m going without baggage. I don’t have a chance of catching ..

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Mean flight attendant. I wanted to reuse my plastic cup, but he (Matthew) said he can't for safety. I then said "I don't want water then" and he poured me a glass. I hope Matthew gets herpes and spends the rest of his life poor, lonely, and homeless.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Both flights delayed. 2nd flight over 3 hours late mechanical issues

Flight was delayed 45 minutes because originating flight was coming from Newark. No complimentary snacks were offered on this 5+ hour flight. No screens for the flight, but movies offered if you had already downloaded the United app (which I hadn't on my ipad). No USB ports, only a flimsy plug-in port near the bottom of the seat that was hard to see and kept coming unplugged.

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

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

Information on your arrival and departure airports