IRVING, Tex. — N.F.L. owners on Wednesday showed signs of grudging support for allowing the San Diego Chargers to move to Los Angeles and the Oakland Raiders to leave for Las Vegas, with plans for stadiums in the teams’ current cities having all but vanished.

The potential relocations dominated discussion publicly and behind closed doors at a league meeting here as momentum grew for the teams to make the moves, which would represent the most significant reordering of the N.F.L.’s geographic lineup in two decades.

The only thing left is for the Chargers to decide next month whether to exercise their option to leave for Los Angeles and for the Raiders to submit a formal proposal to relocate to Las Vegas, where lawmakers have promised to contribute $750 million toward a stadium.

Although the league has said it prefers teams to remain in their home markets, a growing number of owners acknowledged that the Raiders and the Chargers might end up playing in new cities as soon as next season.