5. Booking.com. Booking.com is one of the most popular travel websites on the internet. It offers discounts on flights, hotels, rental cars and even tours and activities once you get to your final destination. The site also offers package discounts when you book your flight and hotel at the same time.
Instead, flights tend to be the least expensive when you book between 5.5 and 1.5 months (164 and 46 days) in advance of your departure date. According to CheapAir.com, you can expect rates to be
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