We want a house with a view of the river.

In the given sentence, the group of words with a view of the river has a preposition and the object of the preposition.

Hence, with a view of the river is a prepositional phrase.

These paintings are on sale until tomorrow.

In the given sentence, the group of words on sale until tomorrow has a preposition and the object of the preposition.

Hence, on sale until tomorrow is a prepositional phrase.

We are on the way to Miami.

In the given sentence, the group of words on the way to Miami has a preposition and the object of the preposition.

Hence, on the way to Miami is a prepositional phrase.