Tokyo is a fast-paced megacity that's steeped in technology and tradition. The city's peaceful temples and manicured Japanese gardens lie in stark contrast to its massive skyscrapers and crowded, urban landscapes. Tokyo is home to over 12 million people, making it one of the most densely populated cities in the world. Tokyo also happens to be one of the most expensive cities on the planet, so if you don't want your trip to break the bank, follow these tips for finding cheap flights to Tokyo.