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The term "round trip" is generally not hyphenated when used as a noun (e.g., "I booked a round trip"). However, it can be hyphenated as "round-trip" when used as an adjective before a noun (e.g., "I purchased a round-trip ticket"). The usage depends on its grammatical role in the sentence.
No
Mostar Round-Trip was created in 2011.
Round Trip to Mars was created on 1957-09-23.
Yes, the round trip there and back is included in the package.
Yes, a round trip there and back is included in the package.
That is the correct spelling of the term "round trip" (there and back). If it is used as an adjective, it should be hyphenated (e.g. round-trip ticket) because otherwise it could be read as two separate adjectives.
A round trip typically takes 2 days.
Round Trip - Sadao Watanabe album - was created in 1974.
A Greyhound round-trip means you are paying for the return trip in advance. Some round-trip tickets are open-ended (with no designated return date) or have a set date (and time) for returning to the departure location.
The shortest round trip driving distance is 482 miles.