I know this is way too early, but better early than never.
For anyone heading over there will be lots of charters no doubt. s7 airline (Siberian airline) will be operating again out of Dublin and will also, according to their Dublin rep (an Armenian) be operating direct flights to Armenia, for the game. A good cheap way over to Moscow is with British Midland who leave and arrive at decent times. Otherwise a hop over to Germany and you've Germanwings and Air Berlin servicing Russia from a number of destinations.
For accommodation in Moscow you'll pay through the nose, it's over priced and rubbish standard (even decent chain hotels). There is an alternative - if you don't mind good old Soviet style rooms that are clean, decent and functional. An hour outside of the centre of Moscow you have a number of spots where you'll pay €10-20 per night for a room. Trains and fast buses run out of Moscow until the wee hours (stopping 1 or 2 am restarting at 4am - both ways) and the connections are right into the main stations - for example Fryazino - rail link into Yaroslavski Station which is on the red metro line and thus ideal for the Luzhniki (or Lokomotiv).
The above is for anyone on a budget and looking to go over for less than a kings ransom.
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