SWIMQUEST
London-based SwimQuest has the most varied offerings, with trips all over the globe and stays ranging from four to eight days, plus itineraries to help swimmers train for long-distance events (from $1,165).
SWIMVACATION
The only U.S. outfitter on this list, SwimVacation hosts upscale trips across the planet, each with gourmet food and craft cocktails. In Hawaii, you’ll swim over coral reefs, complete the infamous Kona Ironman swimming route, and relax in an airy beachfront home (from $3,995 for seven days).
STREL SWIMMING
Founded by Martin Strel, famous for swimming the Amazon and Mississippi Rivers, this UK company hosts trips off the coasts of Croatia, Turkey, Montenegro, and Greece. Don’t like salt water? Try Lake Powell (from $1,090 for four days).
SWIMTREK
Based in Brighton, England, SwimTrek charters trips to…