Right now you can do Thursday - Monday for around £250/60 on flights. I'm doing Birmingham to Antalya for £194 and then Antalya to Istanbul was £66 the next day. Those are return flight prices as well. Can get a train from Manchester straight to Birmingham Airport as well.
Birmingham > Antalya - Thursday
Antalya > Istanbul - Friday
Istanbul > Antalya - Sunday
Antayla - Birmingham - Monday
I'm also going by myself so if anybody wants to meet for a beer let me know haha. I'm staying near Besiktas stadium, going to try and do a tour of their ground and Galatasary. Fenerbache don't do one apparently.