Three airports serve Miami — MIA (Miami International, the main international gateway), FLL (Fort Lauderdale, actually CLOSER to Hard Rock Stadium!), and PBI (Palm Beach, 70 mi north). Most international visitors fly into MIA; FLL is often cheaper and closer to the stadium.
Miami International (MIA) is South Florida's main international gateway — 8 mi west of downtown, 17 mi south of Hard Rock Stadium. Massive international traffic from Latin America (the largest Latin American hub in the US). Spanish announcements throughout. The airport itself is a Cuban-Latin American cultural experience.
All concourses connect via the Skytrain (free, every 5 min). Allow ~15 min between concourses on Skytrain. The MIA Mover (separate from Skytrain) connects the airport to the Miami Intermodal Center (MIC) for ground transit.
If domestic fares are significantly cheaper into FLL or PBI, here's what to expect. FLL is actually closer to Hard Rock Stadium than MIA — worth highlighting for international fans.