Well, it's been made Apple's App of the Week for iOS and it's been made free: I'm guessing it'll return to its incredibly expensive 69p in about seven days' time. But grab it now. Even if you're not travelling much by air now, grab it, see what it's like, delete it if you want to, and always be able to get it back for free. That's even after the price goes back up.

Kayak Pro for iOS on the App Store here

Kayak Pro just looks for flights from here to there. You get all the ones there are and you get 'um arranged by price. (There are other ways of sorting the data but, come on, it's price and specifically low-to-high that you look for.)

It also does hotels, car hire and it can do combinations of all these. So can many other apps but I have kept coming back to Kayak because it does the job and I like it. I can't think of a better reason to recommend that. Though if the company ever wants to sponsor me for anything, I'll work on it.