The are 6 different ways across 3 unique modes of transportation to help you travel from Bakersfield to Temecula. If you're only considering the price, you should check out the bus out of Bakersfield towards Oceanside, as it is the cheapest to Temecula. It's common to find tickets for as low as $20. Greyhound operates from Bakersfield to Temecula, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Bakersfield to Temecula, it is best to book as soon as possible. It won't necessarily help reduce your price by a large amount, but will ensure that you have a spot on the bus or train.