The website of the Official Airline Guides, which has an address not dissimilar to the initials of that publication, followed by a dot and a com, has that kind of information. It will tell you which airlines fly which routes, and which destinations are served from which airports, but if you want timetable information you have to buy one of their products, something which I clearly am not endorsing.
Otherwise, find a friendly travel agent and ask if he's got any spare copies of old OAG books. They get fresh ones every month and throw the previous ones away.