Portuguese has a second future: a single word, like viajarei (I will travel) or será (it will be). Brazilians rarely use it in conversation — that's what ir + infinitive is for. But you'll read it all the time in formal language: the news, weather forecasts, announcements, contracts, formal emails.

It's easy to form: take the whole infinitive and add the endings — the same for -ar, -er and -ir verbs:

Pronoun	Ending	Viajar	Ser	Partir (to depart)
eu	-ei	viajarei	serei	partirei
você / ele / ela	-á	viajará	será	partirá
nós	-emos	viajaremos	seremos	partiremos
vocês / eles / elas	-ão	viajarão	serão	partirão