by 
zeuspoop
ANSWERS: 5
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Too many variables here. At slow speeds, in good weather, you can "limp along" on a flat for miles.
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How flat is "flat"? If you're riding on your rim, you shouldn't go anywhere on it, as you'll ruin the rim and have to replace that too, which is expensive. That's what spare tires are for. If it's just a little flat, you can go places if you really have to, just try to avoid going fast, because it can blow out and cause an accident. Ideally, you should just put on the spare and go get a replacement.
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I read your comment to Darryl61's answer and I would recommend checking to see if our neighbors have an air compressor. If the rim is still >3 inches off the ground or the pressure is >15 Psi, you can EASILY make it a few blocks. I've driven 15 miles at normal highway speeds at 15psi and not damaged the rim or tire. If the rim is on/near the ground though, don't move it. Use a bicycle pump if you have to. Or get a can of Fix-a-flat. DO NOT drive on your rim. I've sliced sidewalls in under half a mile that way (no shoulders).
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If your goal is to save the tire, I wouldn't try it. Just call the mobile repair, and they will come to your house and fix it, for a fee. If you get a flat on a freeway, it's best to forget trying to save the tire, just drive on it anyway until you get to a safe place to pull off, and then call a tow truck, or mobil service. AAA has a service that will ask the make and model of your car, and show up with a new tire, put it on, and you're done.
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Not very far. Change the tire the moment it gets flat, or else that tire's gonna end up junk, even with 98 percent thread in there. Though most steel-belted tires today are tough enough to withstand puncture, they aren't designed to be run with no air. There are so-called "run-flat" tires in the market, but they are quite expensive and they affect the car's handling.
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