I guess it depends on how flexible you are. If you can get there a few days before the first game, and then wait until a few days after the Turkey game- flights will be reasonable. However, if you want to get in and then out, Friday and then the following Thursday- you can do it for just over £500 return with 1 stop either way. (when I last checked, which was 2/3 weeks back). In via Istanbul. Back via Moscow.