<p>Sometimes you can get discounts if your daughter has an ISIC (International Student Identity Card), but not usually. AirTran has a standby program for university-age people between 18 and 23 - you pay something like $70 per leg for a flight, and $90 per leg for longer flights to certain destinations, but like I said, it’s a standby program. No booking.</p>
<p>I second Kayak.com to find the cheapest fares, but you will have to crawl Southwest and JetBlue on your own (they are sometimes cheaper). I also don’t think Virgin is represented on there.</p>