For the cheapest fares, fly into Sacramento and then rent a car—you'll need one anyway—and drive north. Redding, which is served by United Express, has a small airport. There’s no shuttle service, but you can take a taxi for about $32 to downtown Redding.
Redding Municipal Airport. 6751 Woodrum Circle, off Airport Rd., Redding, California, 96002. 530/224–4320; www.cityofredding.org/departments/airports.