A friend of mine needs to fly today. All typical aggregated booking sites don't allow searching for today. Anyone know where it is possible?
Kayak allows 'today' flight searches. You should also be able to make bookings with airlines on their websites directly.
Most definitely Kayak - it's my number one stop for flights, be they a year ahead, or 5 hours from now. And they certainly support LCCs - I once used Kayak to work out that Miami to London was quite a bit more expensive than Miami to Dusseldorf, and find another way for the final leg. So I flew to Dusseldorf, trained to Cologne, went into a net cafe, found an EasyJet flight later that day, had lunch and headed to the airport.
It's certainly made travel more flexible for me - thinking back to using travel agents makes me cringe :/