Flight
Mammoth Airport is the closest to town (10 minutes), but offers limited flight options from a few select airports via a charter service. Check the website linked here for dates and locations.
Flight
This is the closest commercial airport to Mammoth (45 minutes away) and does daily flights with United from San Francisco International airport.
Flight
This is the closest big(ish) airport and is about 3 hours driving from Mammoth Lakes.
Travel Note
Mammoth has TONS of AirBnb's and hotel options. Popular choices for hotels are the Westin and Juniper Springs Resort. AirBnb's are all over town, and if you plan on shuttling to the venue, pick something near a shuttle stop on the Teal or Red Line (see link below for map). The Brasserie is closest to Stop #7 on either the Teal or Red Lines.
Rental Car
If you are flying into Bishop, you can rent a car from Enterprise or connect with other guests who are also flying into this airport.