4 sentences

1. 这将是一次单程旅行。

   zhè jiāng shì yī​cì dān​chéng lǚ​xíng.

   It will be a one-way trip.

   Source: CCMatrix

2. 我只买了单程车票。

   wǒ zhǐ mǎi le dān​chéng chē​piào.

   I only bought a one-way ticket.

   Source: OpenSubtitles

3. 他们买了一张单程票。

   tā​men mǎi le yī zhāng dān​chéng​piào.

   They bought a one-way ticket.

   Source: OpenSubtitles

4. 婚姻是一张单程票。

   hūn​yīn shì yī zhāng dān​chéng​piào.

   Marriage is a one-way ticket.

   Source: CCMatrix