The Istanbul-based company last month signed a three-year, 3 million euro sponsorship deal with European chamnpions Barcelona as it seeks to become a global brand.
Details of the deal with United were not disclosed.
"This deal is yet another indication of the global appeal of Manchester United and we are very pleased to welcome them (Turkish Airlines) to the club," United chief executive David Gill said in a statement on the club's website.
Under the terms of the deal the airline will fly the team's players and officials to relevant matches, tournaments and training camps as United's official carrier.
The Manchester club's finances were also boosted during that time by the sale of Portugal winger Cristiano Ronaldo to Real Madrid for 80 million pounds.
