German
Oktoberfest has evolved over the years into the largest festival in the world with over six million visitors visiting each year. It can be hard to find a hotel room in Munich during Oktoberfest in September or October, I would recommend booking in July/August, If you haven't booked by October it's still possible to find a room; sniff out hotels in nearby cities: Augsburg, Dachau, Freisling, and Erding are good bets. Take a look at this link
Hotels in Munich and here you can find the prices of flights and book online
Airlines to Germany.
Have a good time!