Tā mǎi le yī zhāng qù Shànghǎi de dānchéngpiào, juédìng zài nàlǐ dìngjū.
She bought a one-way ticket to Shanghai, having decided to settle there.
Tips
usage
单程票 (one-way ticket) contrasts with 往返票 or 来回票 (round-trip ticket). 单程 means 'single journey' and 票 means 'ticket'. This applies to trains, planes, buses, etc.