[header] How to contact hipmunk customer service [title] Sign into your e-mail account. [step] Open a web browser or your preferred e-mail client software (microsoft outlook, mozilla thunderbird), and log into your e-mail account. [title] Compose your message. 
[step] Once you're inside your account, compose a new message stating your questions, suggestions, or comments. Summarize the reason for your e-mail in the subject line, and address your message to contact@hipmunk.com.