What is the cheapest way from Seattle to -Anywhere tropical that doesn't require a pport- Christmas day?

Okay, so im trying to get out of here last minute for the holidays. Apparently "stand-by" tickets aren't an option nowadays. Cheapest ways on getting out of here if im not going to have any money until Christmas? I wanted to depart christmas day (flexible, if i will save more money leaving earlier/later) and coming back around the 3rd or 4th of January(also flexible). Any suggestions? I was thinking ether Honolulu, L.A., Bahamas, etc.? I just want to go somewhere tropical for the holidays that doesn't require a pport.. Any ideas/suggestions on cheap last minute travel? I don't need any negativity, thank you(: