If you plan a trip to northern California here is the offer from United Airlines for return tickets from Chicago to San Francisco which you can now get for only $159 including all taxes

Travel dates:
April 2016

Visit -> Cheapoair.com here and adjust your travel dates

Sample reservation:

cheap flights from Chicago to San Francisco

Price includes all taxes

Car Rental:

Search and compare car rental rates and availability of the major rental companies at Rentalcars.com HERE