Medical personnel carried a male, believed to be Warmbier and wearing a blue shirt and dark blue trousers, off the plane without the use of a stretcher. The 22-year-old was then taken by ambulance to the University of Cincinnati Medical Center.
Warmbier, a University of Virginia undergraduate, was visiting the North Korean capital, Pyongyang, as part of a student tour group.
U.S. Senator Rob Portman of OH said: "Otto's detainment and sentence was unnecessary and appalling, and North Korea should be universally condemned for its abhorrent behaviour".
Secretary of State Rex Tillerson announced Warmbier's release Tuesday and said he'd be reunited with his family.
Donald Trump's spokeswoman Sarah Huckabee Sanders said securing Mr Warmbier's release "was a big priority" for the president, who worked "very closely" with the.
In a tearful statement made before his trial, Warmbier told a gathering of reporters in Pyongyang he was offered a used auto worth $10,000 if he could get a propaganda banner and was also told that if he was detained and didn't return, $200,000 would be paid to his mother in the form of a charitable donation. North Korea is not to be trusted, either in what it says or what it does. Rodman, in an interview with CNN before landing in North Korea, said he was "trying to accomplish something we both need", referring to himself and the Trump administration.
The arrests have come at a time of heightened tension between North Korea and the United States and its regional neighbours.
The White House says a US envoy met with North Korean foreign ministry representatives in Norway last month as part of efforts to win freedom for Americans held by Pyongyang.
"Otto has been terrorized and brutalized for 18 months by a pariah regime in North Korea", the father said in an interview scheduled to air Thursday night.
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It is the first time that the US administration has confirmed the dispatch of a ranking official to North Korea since President Donald Trump took office in January. On the same trip, he suggested that an American missionary was at fault for his own imprisonment in North Korea, remarks for which he later apologized.
Rodman said the issue of several Americans detained by North Korea is "not my objective right now", in remarks made in Beijing before the release of Warmbier was publicly disclosed.
The Warmbier family said North Korean officials told the US envoys that soon after his trial in March 2016, their son reportedly became sick with botulism, an illness caused by a toxin, and fell into a coma after being given a sleeping pill, according to the Post.
Imprisoned in North Korea are three of a U.S. citizen.
"Joe Yun went to Pyongyang (Monday) to accompany Mr. Warmbier", Shannon told reporters after a meeting with South Korean Vice Foreign Minister Lim Sung Nam. Three other USA citizens are believed to still be in North Korean custody.
There was no immediate confirmation from US officials of North Korea's description of his illness. This reportedly occurred a year ago - but his family was just alerted of his condition last week, according to a statement released by the Warmbier family.
North Korea is believed to be making progress toward developing a ballistic missile capable of reaching the US.
The three other Americans detained by North Korea remain there. A 2009 visit by former President Bill Clinton, a Democrat, secured the freedom of American journalists Euna Lee and Laura Ling.
Surrounded by North Korean guards, Warmbier delivered a highly scripted "confession" that appeared to have been written for him, and after an hourlong sham trial in March 2016, he was sentenced to 15 years.