I've got a trick to get your car started.
The problem that occours when a car is flooded is that the gas that is still in the cylenders is thinner than oil. This causes low/no compression. To raise the compression in the motor you either have to wait till ALL the gas in there dissipates (grab a lawn chair). Or you can raise the compression in the motor and get it started.
SO you've decided to raise the compression and not be without a car for 3 weeks. Great. All you have to do is get a quart of oil and a turkey baster. Pull all your spark plugs, drop some (not alot, but a fair ammount, probably around 2tbsp) oil down each spark plug hole. The turkey baster will help with this. Put your old plugs back in, close everything up, and get in your car. Start it up, don't burn out your starter, it should catch fairly quickly, but you may have to give it some gas or lay on the starter a bit. You're going to be burning ALOT of oil when you first start it up and probably for a few minutes after. Rev it a bit or drive down the road. You are going to foul your plugs up a bit doing this, but your car will start. It will smoke like a bitch till that gas finds its way out of your oil.
Replace your plugs and do an oil change as soon as you can after doing this, but make sure the car isn't throwing out any smoke before you change your plugs/oil.
If the car is REALLY flooded (you can smell lots of gas on your dipstick), change the oil before you raise the compression. This is going to take awhile since the motor won't be hot. You're looking at about 4 hours to drain since the oil is cold.
If it tries to start and almost catches but then dies out, you'll have to repeat the process.