For Your Convenience, Our Travel Advisors are available Monday-Friday 8am-7pm EST
Phone: 301-816-8991
Toll Free: 1-800-638-8500
Emergency After Hours 1-877-853-3648
Emergency After Hours Outside USA: 1-516-730-2648
Email Travel Request: NIH@worldtravelservice.com
To Cancel Reservation: cancel@wordltravelservice.com
Customer Service: mgt@worldtravelservice.com
WorldTravelService
6010 Executive Blvd
Suite 202
Rockville, MD 20852
![](https://b24f95.a2cdn1.secureserver.net/wp-content/uploads/2014/06/reservations-and-bookings-contact-center-1024x768.jpg)