Tucson international airport is located about 9 miles/14 km (~20 min drive) from the Tucson Marriott University Park (main conference location) and has a great airport information page at http://www.flytucson.com/airlines-and-flights/ . It is an international airport with customs, but is small/mid-size. It has direct flights within the US (see http://www.flytucson.com/airlines-and-flights/), but you will likely need to change flights if traveling internationally.
Phoenix Sky Harbor International Airport (https://skyharbor.com/) is approximately 115 miles/185 km (~2 hour drive) from Tucson. The airport is bigger than Tucson, with direct international flights from Canada, Mexico, and London. Rental cars are available at the airport, or shuttle services (rates vary – check the Phoenix Airport site for details). Greyhound bus (trip time = ~2 hr, 20 min) has a station 1/2 mile from the Phoenix airport http://locations.greyhound.com/bus-routes/destination/phoenix-az/tucson-az#fare-search with rates starting at $10 between Phoenix and Tucson.
TO/FROM TUCSON AIRPORT:
Shared-ride van services (Arizona Stagecoach)
Arizona Stagecoach has a counter in the baggage claim area of Tucson airport where you can book a shared ride to the hotel. There is a discounted rate for conference attendees going to and from the Marriott University Park. Please use the code IBS2017 when booking to get the discounted rates:
$17 one-way, per person. $4 each additional passenger on the same booking.
$30 round-trip, per person. $8 each additional passenger on the same booking.
A taxi from the airport to the Marriott University Park costs ~$26-$30. You will need to walk out of the airport by baggage claim to the taxi pick up location (http://www.flytucson.com/parking-and-transportation/taxis/).
A city bus from the airport to the the University Visitors Center near the Marriott costs $1.50. See http://www.flytucson.com/parking-and-transportation/public-transit/. You will need to take bus #25 and there will be one transfer to either #1, #6 or the street-car, all heading towards the University of Arizona (or you can walk 10 blocks from the transfer station). Plan your route here: http://www.suntran.com/ (exact change needed, unless you pay by SunGO card – details here http://www.suntran.com/fares_passes.php).
TO TUCSON BY GROUND:
The Greyhound Bus station is located at 471 West Congress Street, Tucson, AZ 85701. Tickets and info at http://locations.greyhound.com/.
AMTRAK has a station at 400 N Toole Ave, Tucson, AZ 85701. Tickets and info at https://www.amtrak.com/home.
If you’re driving, the main conference venue is the Tucson Marriott University Park, 880 E 2nd St, Tucson, AZ 85719.
Parking (Tucson Marriott University Park)
On-site parking, fee: 13 USD daily
Valet parking, fee: 23 USD daily
Garage height clearance 7 feet. Self-parking is free on Saturday and Sunday. Short term/day valet parking is 10 USD .
More info about getting to, from and around Tucson can be found here: http://www.visittucson.org/about/transportation/