Another passenger said the cabin filled with smoke as the plane landed. Those passengers have been treated and released.
Delta Air Lines Flight 1854, which was delayed by three hours, arrived safely Tuesday night, the company said.
An airport spokesperson said there may have been minor injuries due to the evacuation on emergency slides. "Thank goodness for the passengers who take care of things", passenger Rachel Naftel wrote on Twitter.
The smoke in the plane was caused by a small amount of hydraulic fluid that leaked onto the APU or auxiliary power unit, according to Anthony Black with Delta Airlines.
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One passenger, MJ Davidson, told Denver's 9News people started shouting when masks did not drop down and the doors were not opened immediately.
"After a couple of minutes, the flight attendant was like, 'Everyone get low to the ground and cover your mouth with a blanket, or clothes, or whatever you have.' And maybe a minute later, they finally made the call to evacuate the plane".
Pictures from passengers showed them standing near the plane along with emergency equipment.
Passengers posted photos of the evaluation to Twitter.
Williams did not know how many people were on board or what kind of plane was involved. "I mean, now that I think about it, it was like, what if this would have happened in the air".