Here's an amazing price for a cross-country flight. For September travel, fly from Portland, Oregon to Orlando for $154 roundtrip on United. This is a standard economy fare so you can bring a normal carry-on bag plus a personal item and choose a standard seat for free. For those in central Florida looking to see the Pacific Northwest, this fare also works from Orlando to Portland.
I found seats departing Portland PDX on Wednesday, September 19, returning from Orlando MCO on Tuesday, September 25.
You'll find other dates for travel on Tuesdays, Wednesdays, and Saturdays, in September.
For a list of available accommodations for the above dates, check out Hotelwatchdog.