Ahaadeeth and Sunnats of Traveling
Fasting whilst on journey
54.) Nabi (Sallallaahu ‘alayhi wasallam) fasted as well as abstained from fasting whilst traveling. Hence whoever wishes to fast while traveling may do so, and whosever wishes not to, may do that as well. (In both cases, he will be adhering to the Sunnah).
[Hazrat Abdullah Ibn Abbas (RA) narrates that Sahih Bukhari]
Extracted from Ash-Shamaa`il al Kubra
[The Sublime Conduct of Nabi (Sallallaahu ‘alayhi waSallam) Volume 3]