Call a cab, lyft, uber. Ask a friend. Rent a car and return it to the airport. Take a bus. Take your own car and put it in long term parking. I mean seriously.
RTC has the CX line and other buses that go directly to McCarran Airport for only $3-$5 one way. Call RTC for the bus name/bus number to McCarran, travel hours and actual cost. These buses go to both the domestic and international terminals.
Uber or lift
Uber cab Lyft
Rideshares: Uber, Lyft, or Taxi - Be prepared for surge pricing, airport charge, and dropped rides if you live in the outskirts. I avoided this by guilting friends into rides. 🤣
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