Travel

1. Kayak

2. American Express Travel

American Express Travel offers full service business travel booking - find cars, hotels and flights from multiple carriers.

Noteworthy: Card members can earn double reward points by booking travel here. More

4. Travelocity

Travelocity offers full service business travel booking - compare car, hotel and flight fees from hundreds of carriers - as well some extras for the business traveler: Store booking preferences, membership accounts and multiple credit cards for faster booking, and check out the travel center for tips, weather information and nearby attractions for most U.S. cities.

Noteworthy: Businesses can sign up for Travelocity Corporate Travel accounts that come with unused ticket tracking and free, 24-hour travel support. More

5. Orbitz

Another full-service online booking site, offering flight, hotel and car comparison shopping.

Noteworthy: If your fare drops, Orbitz will send you a cash refund for the difference - automatically. Orbitz also offers rail ticketing through Amtrak to more than 500 destinations. More

6. Hotwire

Get alerts for price reductions on planned trips from this full-service travel site. Comparison shopping available for flights, cars and hotels.