Learn Farsi: سفر به تهران عالی است. - The trip to Tehran is excellent.

The word be means to. Just like in English, it goes right before the destination, making be Tehrân (to Tehran). The phrase safar be Tehrân matches the English structure perfectly word-for-word.

Should there be a connecting -e sound (ezafe) after safar?

In everyday speech, no. While you use the -e sound to connect a noun to an adjective or to a possessor, you usually drop it before a preposition like be. You can just say safar be Tehrân.

There is no word for the in this sentence. How do we know it means the trip?

Farsi does not have a separate word for the. A noun like safar can mean trip, a trip, or the trip depending on the context. Here, because we are talking about a specific trip to Tehran, it naturally translates as the trip.

Why is the verb ast at the very end?

Farsi sentences almost always place the verb at the very end. The structure here is the subject (safar be Tehrân), then the adjective describing it (âli), and finally the is verb (ast).