Spanish has a second future: a single word, like viajaré (I will travel) or será (it will be). For everyday plans, ir a + infinitive is more common. The one-word future sounds firmer and more formal: it's the future of promises, predictions, weather forecasts, the news and formal emails — ¡Volveré! (I'll be back!).

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	Ir
yo	-é	viajaré	seré	iré
tú	-ás	viajarás	serás	irás
él / ella / usted	-á	viajará	será	irá
nosotros	-emos	viajaremos	seremos	iremos
vosotros	-éis	viajaréis	seréis	iréis
ellos / ellas / ustedes	-án	viajarán	serán	irán

Every form except nosotros carries a written accent.