由于【yóuyú】

由于 introduces the cause, and the result follows in the next clause. It means the same as 因为 but sounds more formal, so it is the usual choice in news, notices and reports.

The cause can be a noun phrase, as above, or a full clause.

With 因此 or 所以

The result clause can take 因此 or 所以; 由于…因此 is a common pairing in writing.

由于 comes first

因为 can follow the result: 我没去，因为下雨了. 由于 can't – it opens the sentence, or opens a clause after the subject.

• × 我没去，由于下雨了 → 由于下雨，我没去
• × 航班推迟了，由于天气原因 → 由于天气原因，航班推迟了

The finer differences between 因为, 由于 and 鉴于 have their own point.