Two of Mexico's top low-budget airlines said Thursday they had agreed to merge, setting up a deal that could create one of the country's largest domestic carriers. The deal, expected to close in 2026, is subject to regulatory approval in Mexico and could draw opposition from the budget airlines' main competitor, Aeromexico.

Two of Mexico's top low-budget airlines said Thursday they had agreed to merge, setting up a deal that could create one of the country's largest domestic carriers. The deal, expected to close in 2026, is subject to regulatory approval in Mexico and could draw opposition from the budget airlines' main competitor, Aeromexico.

Mexico’s top-tier airlines, Volaris and Viva, have reportedly agreed to merge, creating a new low-cost airline group that would become the country’s dominant player in the...