Incredible list and guide Tiffany Sun, Thank You!! Although I would include Google Flights under your booking a flight section. I have used countless other services over the years and the prices I have found via their service are unbeatable. They have a great sugestion feature that will show how you can save hundres by leaving a later/earlier or leaving from different airports. I booked a round trip flight from NYC to Manila via Air China 1.5 months in advance and only paid $522. Unheard of.