Hánɡbān yánwù le sān ɡè xiǎoshí.

The flight was three hours late.

航班延误了三个小时。

Notes:

航班(hánɡbān): flight

延误(yánwù): delay, be late

了(le): particle word

三个小时(sān ɡè xiǎoshí): three hours

Example:

A：航班延误了三个小时。

     Hánɡbān yánwù le sān ɡè xiǎoshí.

     The flight was three hours late.

B：太慢了。

     Tài màn le

     It’s too late.