Whale's Mouth was a planetary utopia for forty million Earth colonists - but none ever returned. It took only 15 minutes to get there by instant teleportation, but it was strictly a one-way journey. If you wanted to return, it was always possible to go the long way round - 18 years each way by conventional spacecraft. No one relished that, of course. Then one man decided to try it, and encountered some very powerful opposition.
Used availability for Philip K Dick's The Unteleported Man
July 1983 : USA Mass Market Paperback
August 1979 : UK Paperback
August 1976 : UK Paperback