Low fares down to $548 round trip from Atlanta to Athens with KLM tickets and some Delta-operated flights for travel from next week into March 2017. Lowest fares are August to October departures. Some dates I tried through Google Flights would not price out online and others do price out online with KLM. Delta ticket prices look higher for the same flights on itineraries I saw. There were similar fares for ATL-ATH from KLM ten days ago.
KLM ticket Atlanta ATL – New York JFK (DL) – Athens, Greece ATH (DL) – Amsterdam AMS (KL) – Atlanta ATL (DL)
KLM ticket Atlanta ATL – Paris CDG (Air France) – Athens, Greece ATH (AF) – Amsterdam AMS (KL) – Atlanta ATL (DL)
As I write this I have been checking several dates for August-September flights and most of the itineraries I check on Google Flights do not price out online. When Google Flights returns the message call the airline or book through a travel agent, that is when I find Momondo.com will generally pull up the low fare or an even lower fare bookable through an online travel agency OTA.
CitiAir.com ticket Atlanta ATL – New York JFK (Delta) – Athens ATH (Delta) – Rome FCO (Alitalia) – Atlanta ATL (Delta)
$540.26 round trip Thu Sep 8 – Sat Sep 17
CitiAir.com online travel agency ticket price
Loyalty Traveler curated Airfare Deals.