The flight distance from Cluj-Napoca International Airport (CLJ) in Cluj-Napoca, Romania to Denver International Airport (DEN) in Denver, United States is 9,106 kilometers (5,658 miles / 4,917 nautical miles). The estimated flight time for this route is approximately 12h, 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 Romania 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 10:57 in Cluj-Napoca, it's 01:57 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 4,398 feet between the two airports. Denver International Airport sits higher than Cluj-Napoca International Airport. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Denver (DEN) to Cluj-Napoca (CLJ) follows a heading of 33° (north 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 Cluj-Napoca International Airport (CLJ) and Denver International Airport (DEN) detail pages, or use our flight duration calculator to compare other routes.