Hipmunk has been my go-to flight site, so I was bummed when I saw the notification that it is shutting down on January 23, 2020. Just thought I'd share the news (since others here might also use it).
"In 2016, Hipmunk was acquired by SAP Concur [https://www.concur.com/]. As its approach to providing business travel solutions has evolved, SAP Concur has made the decision to retire the Hipmunk product."
I used Hipmunk all the time for finding and comparing flights because their filtering was really easy to use, but I never had any reason to book through their site because I had all the information about the flights and could book directly.
