Acapulco International Airport (ACA), officially General Juan N. Alvarez International Airport, is a real, working resort gateway on Mexico's Pacific coast, but its lounge provision is modest compared with a major hub, so temper expectations of a large Priority Pass style space before you fly. If any lounge or VIP salon operates here, expect it to be small and tied to a specific airline or a pay-in arrangement rather than an elaborate multi-lounge terminal.
Acapulco's air traffic runs heavily to the beach season calendar: winter and spring months bring the busiest waves of domestic leisure travellers and snowbird visitors, while the rainy, hurricane-season months from roughly summer into early autumn are quieter at the airport, with fewer flights and shorter lines. That seasonal swing matters more for planning your arrival time than any lounge question does, since a crowded high-season terminal changes the practical wait far more than a missing lounge would.
Guerrero, the state Acapulco sits in, does appear on a number of governments' travel advisories for crime-related concerns beyond the immediate tourist zone, so it is worth checking your government's current guidance for the state alongside any Acapulco-specific carve-outs before you travel, separate from the lounge question entirely.
For a genuine lounge experience on this itinerary, Mexico City's airports are the real answer. Mexico City International Airport (MEX) hosts Aeromexico's Salon Premier lounges for elite frequent flyers and eligible premium-cabin passengers, alongside Priority Pass options, a full contrast to Acapulco's modest provision. If your trip connects through Mexico City either way, plan your lounge stop there and treat Acapulco as the beach-season endpoint rather than the lounge stop.
Most travellers flying into Acapulco are routing from Mexico City or another domestic gateway rather than arriving on a long international leg directly, so building any lounge time into the connecting airport rather than the resort end usually matches the realistic itinerary anyway. Confirm current terms for whichever lounge you plan to use before you travel, since access rules and hours can shift, particularly around Acapulco's high-season crowding.