To plan your trip: bing.com/travel.
Best for: Deciding when to buy a ticket or book a room.
Winning features: If you’re not a frequent flyer, it can be hard to tell whether a ticket price is higher or lower than normal. This site’s “price predictor” analyzes past data to tell you whether you should buy now or wait for the price to drop.
Weak spots: The price predictor is available for only some flights (but most major U.S. and Canadian cities are accounted for); the rate indicator, which tells you whether a room rate you’ve been quoted is typical for the hotel, is limited to 30 U.S. cities.