Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
one-day excursion [ˈwʌndeɪ-] n (US) обра́тный биле́т (действи́тельный в тече́ние одного́ дня)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.