Unlike N.B.A. players, W.N.B.A. players fly commercial planes because of the cost of charters. There have been scores of travel complications during the league’s 22-year history. The Indiana Fever and the Sun canceled a game in Connecticut in 2015 because the Fever had run into problems on the road.

Ogwumike, whose sister Nneka is the president of the executive committee, said the union backed the decision even though it might lead to consequences for the Aces.

“The players decided, no matter what the W.N.B.A.’s decision was, that they would take this action,” Chiney Ogwumike said. “At the end of the day, Vegas made its own decision and the union is here to support them.”

The W.N.B.A. did not respond to a request for comment on the Aces’ decision.

The Aces were awaiting the league’s decision on a potential punishment Sunday as they fell, 109-88, to the Sun at Mohegan Sun Arena. With the Aces one and a half games out of a playoff spot, a league ruling of a forfeit could have a major effect on the race.

“We took it all into consideration,” Carolyn Swords, the Aces’ union representative, said before Sunday’s game. “It was a very involved and intricate discussion to have. We always want to be able to compete. We take the responsibility very seriously to play in front of our fans. It goes to show how much it weighed on us as we were deciding. A possible forfeit is not helpful, but it really was an issue of health and safety.”