Platform: Android, BlackBerry, iPhone
Once you’ve used this app, you may never book another trip with your laptop again. Kayak makes searching for deals on flights, hotels, and car rentals a cinch, thanks to the convenient scrolling calendar, and Kayak results return very quickly. You can also filter results (airline, airport, price, stops) with just a tap of your finger. Don’t feel like doing everything electronically? Kayak gives you the option of booking online or clicking to call an agent from the app. Kayak First Class for iPhone users lets you search for first and business class airfares. Android phone owners will like the direct link to Kayak’s Twitter feed, which includes travel tips.
Free (Basic), $1.99 (First Class; iPhone); www.kayak.com/mobile