Hopper sends push notifications with flight price changes. It has been downloaded over 100 million times, uses user shopping behavior to best forecast when to book. Hopper also recommends when you should buy, charging a $5 flat fee when you book within the app.
Skyscanner searches for the most affordable flights, rental cars and hotels via its partner. It shows you cheapest dates within a monthly calendar. Skyscanner can also search "Top Deals" from your airport of choice if you're unsure of a destination.
Kayak searches across travel sites, getting you the best deals on your dates and destination of choice. It can search for flights, hotels and rental cars. Kayak acts as a trip planner, allowing you to access things like your hotel confirmation or gate number in real-time.
Airfare Watchdog sends notifications when flight prices drop. It allows you to see the cheapest flights from your airport of choice without a destination. Airfare Watchdog also allows you to search for the cheapest hotels.
Hipmunk searches across travel sites, getting you the best deals on your dates and destination of choice. It searches for the best hotel prices including last-minute specials for that night. Hipmunk also sends notifications when flight prices drop.
This article was written by a staff member of TheStreet.