I bought tickets from Delta coming from San Francisco to Orlando in February. Our trip is from April 21 - April 26. We have stop overs in both ways (Detroit one way and Minneapolis the other way). Luckily they had a special deal, so our tickets were only $200 round trip including tax! Only bad thing is each checked in luggage is $25.
You should subscribe to sites like TravelZoo and they'll email you when tickets going to Orlando are on sale. The only problem is they are often only on sale for a few days (or one day!). This means you might have to make arrangements in a short period of time.
Hope this helps!