Airline consolidators routinely offer discounted international flights to Europe and other places. After purchasing the tickets in bulk, they are able to offer them at a substantial savings for the consumer. Flexibility and advance planning will yield the biggest savings.
Consider flying into one city and out of another. Many major European cities are in close proximity, within a few hours drive, and the potential savings could be significant.
This might seem like an obvious option, but the old stand-by travel agent still has some merit. A travel agency often has exclusive access to pooled airfare discounts and can pass those on to the consumer.
Charter and courier flights have cheaper fares, but the offerings of such flights have diminished greatly. Many restrictions apply as well, such as the need to live near a few choice departure cities, limit luggage to carry-on and fly with little notice.
Provided you're in Eurasia or Asia in some instances, travel by train is possible. Affordable fares are available from Moscow to London and between other cities as well.
