The wifi service at Denver International Airport is the fastest on offer among the 20 busiest US airports, according to a new study from broadband-speed testing firm Ookla.

The free service allows travellers to download data at an average speed of 61.74 Mbps, compared to just 2.71 Mbps at Atlanta’s Hartsfield-Jackson International Airport, the busiest airport in the US, which has the slowest wifi according to the study.

Based on its Speedtest metrics, Ookla reported that other airports with comparatively swift wifi connections were Philadelphia International Airport, Seattle-Tacoma International Airport, Dallas-Ft. Worth International Airport, and Miami International Airport. Upload speed was also highest at these airports.

“From a dismal 2.71 Mbps average download speed over Atlanta’s wifi to Denver’s average of 61.74, you could be facing the difference between an audio-only experience and actually being able to distract your weary travel companions with an HD movie,” according to Ookla.

Sluggish download speeds also were found in Orlando International Airport, San Francisco International Airport, Las Vegas/McCarran International Airport, and Minneapolis-St. Paul International Airport.

Ookla also looked at connection speed when connecting to the internet over cellular networks and found that downloads were fastest at Detroit International Airport, San Francisco, Minneapolis-St. Paul, Chicago-O’Hare International Airport, and Orlando.