The flight distance from Eleftherios Venizelos International Airport (ATH) in Athens, Greece to Denver International Airport (DEN) in Denver, United States is 9,904 kilometers (6,154 miles / 5,348 nautical miles). The estimated flight time for this route is approximately 13h, flying northwest at a heading of 323°.

This is an ultra-long-haul route, one of the longest in aviation. It requires wide-body aircraft with extended range capability such as the Airbus A350-900ULR or Boeing 777-200LR. Passengers should prepare for an extended flight with multiple meal services.

This is an international route connecting Greece with United States. It is an intercontinental flight between Europe and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 08:59 in Athens, it's 23:59 in Denver. With a 9-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

There is a significant elevation difference of 5,126 feet between the two airports. Denver International Airport sits higher than Eleftherios Venizelos International Airport. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Denver (DEN) to Athens (ATH) follows a heading of 38° (northeast). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Eleftherios Venizelos International Airport (ATH) and Denver International Airport (DEN) detail pages, or use our flight duration calculator to compare other routes.