Flight from Manchester to Düsseldorf with Eurowings going out on 8th June, returning 11th June - £159.98 return.
1 night accomodation in Düsseldorf - £43
Flight from Düsseldorf to Istanbul on 9th June, returning on 11th June in time for my Eurowings flight home (hopefully!) - £292
2 nights in an Airbnb near Taksim Square - £76
Might need to add a cabin bag to my Eurowings flights - £42
Match ticket - £62
Beer tokens - £300-£350
So looking at around £1000 altogether as long as there are no big hidden costs. As a comparison, when I did Porto in 2021 I paid £599 for the Sport Options 2 nighter with hotel room (single room supplement), £62 for my match ticket, and approx £250 for Covid tests. Add in what I spent which was around £200-£250 and Istanbul looks like it might come in a bit cheaper despite me having an extra night on the lash