Longman Dictionary of Contemporary English
day return
noun
EXAMPLES FROM CORPUS
▪ She left early, bought a day return, and sat back to enjoy the journey.
▪ Since February 22, passengers buying a cheap day return have been able to get a second ticket for £1.
▪ Typical fares: day return from Kilburn to Blackfriars, £2.40.
▪ Young orangs living free in the forest all day return in the afternoon for their meal of bananas and milk.
WordNet
day return
n. a return ticket (at reduced fare) for traveling both ways in the same day