Both Alaska Airlines and United Airlines have round trip airfares travelling to and from Orlando (MCO) and San Francisco (SFO) for $257, nonstop. On United Airlines, the flights will be a basic economy fare so choose Alaska Airlines' flights first!
Departs & Returns: Tuesdays, Wednesdays and Saturdays from Sept 4 thru Nov 7 and then again Dec 4, 5
To book: For the most up-to-date and cheapest airfares, plug in dates to Skyscanner [skyscanner.com]
and select your favorite OTA from there to book it. Skyscanner has multiple choices including our favorites Expedia, Priceline, etc..
For hotels, check out Hotwire's Hot Rates [hotwire.com]