ONT - ATH

$241 Find Cheap Flights from Ontario to Athens

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 Athens departing on 5/5. 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 Athens

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Athens, 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 Ontario to Athens, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$456
American Airlines
Tue 3/3Tue 3/10
ONT - ATH • 2 stops
Cheapest one-way
$241
British Airways
Tue 5/5
ONT - ATH • 2 stops
Top airlines
American Airlines
Cheapest • from $456 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Athens!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Athens (ONT-ATH)

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

Tue, Mar 3 - Tue, Mar 10
American Airlines Logo
10:56 am - 7:30 pm
ONT
-
ATH
22h 34m
2 stops
American Airlines Logo
7:55 pm - 6:42 pm
ATH
-
ONT
31h 47m
2 stops
$456American Airlines
Wed, Feb 18 - Mon, Feb 23
British Airways Logo
2:39 pm - 1:05 am
ONT
-
ATH
24h 26m
2 stops
British Airways Logo
7:45 am - 10:49 pm
ATH
-
ONT
25h 04m
2 stops
$465British Airways
Fri, Feb 27 - Sat, Mar 7
British Airways Logo
2:39 pm - 9:55 pm
ONT
-
ATH
21h 16m
2 stops
British Airways Logo
8:05 pm - 9:07 pm
ATH
-
ONT
35h 02m
2 stops
$490British Airways
Mon, Mar 2 - Mon, Mar 16
United Airlines Logo
6:37 pm - 1:40 am
ONT
-
ATH
21h 03m
2 stops
United Airlines Logo
6:25 am - 10:18 pm
ATH
-
ONT
24h 53m
2 stops
$502United Airlines
Sat, Feb 14 - Thu, Feb 26
British Airways Logo
11:58 pm - 1:20 am
ONT
-
ATH
39h 22m
2 stops
British Airways Logo
7:30 am - 11:59 pm
ATH
-
ONT
26h 29m
2 stops
$503British Airways
Tue, Feb 3 - Wed, Feb 11
United Airlines Logo
1:53 pm - 1:40 am
ONT
-
ATH
25h 47m
2 stops
United Airlines Logo
6:35 am - 8:58 pm
ATH
-
ONT
24h 23m
2 stops
$504United Airlines
Tue, Mar 3 - Tue, Mar 10
Delta Logo
7:30 am - 1:15 am
ONT
-
ATH
31h 45m
2 stops
Delta Logo
12:20 pm - 11:47 am
ATH
-
ONT
32h 27m
1 stop
$505Delta
Mon, Feb 9 - Mon, Feb 23
British Airways Logo
4:45 pm - 11:10 pm
ONT
-
ATH
20h 25m
2 stops
British Airways Logo
7:45 am - 10:49 pm
ATH
-
ONT
25h 04m
2 stops
$507British Airways
Sat, Feb 14 - Thu, Feb 26
British Airways Logo
11:58 pm - 1:20 am
ONT
-
ATH
39h 22m
2 stops
British Airways Logo
7:50 pm - 10:07 pm
ATH
-
ONT
36h 17m
2 stops
$514British Airways
Tue, Mar 24 - Tue, Sep 15
British Airways Logo
10:56 am - 1:20 pm
ONT
-
ATH
41h 24m
2 stops
British Airways Logo
5:30 pm - 9:50 pm
ATH
-
ONT
38h 20m
2 stops
$526British Airways
Booking Insights

KAYAK's insights & trends for Ontario to Athens flights

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

Which airlines provide the cheapest flights from Ontario to Athens?

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 Athens were found on American Airlines ($456) and United Airlines ($502).

Good to know

Low seasonFebruary
Cheapest flight$241
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly with an average 66% increase in price.
Flight from Ontario to Athens

When to book flights from Ontario to Athens

Are your dates flexible? Find out the best times to travel from Ontario to Athens 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 Ontario to Athens

  • What is the cheapest flight from Ontario to Athens?

    In the last 3 days, the lowest price for a flight from Ontario to Athens was $241 for a one-way ticket and $456 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in Ontario and on arrival in Athens.

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

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

  • Which airline alliances offer flights from Ontario to Athens?

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

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

    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 Athens.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Athens from 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 from Ontario to Athens?

    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 Athens with an airline and back to Ontario with another airline. Booking your flights between Ontario and ATH 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 Ontario to Athens?

    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 Athens from Ontario 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 Athens

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Athens. 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 Ontario to Athens? 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 9190 reviews
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
7.1Entertainment
Airline reviews

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

10.0 ExcellentVanessa, Jan 2026
SFO - IAD
Read more United Airlines reviews

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

Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.

It was great with United overall except for two things. 1) It was a 5-hour flight and we were with kids, so we were asking for extra snacks. They were extremely reticent to dole them out even though there wasn't any meal and the kids were starting to hit their limit towards the end. 2) Baggage didn't arrive until 80 minutes after we landed.

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

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.

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

Information on your arrival and departure airports