His fight seem will crash.可以这样说吗?他的飞机将坠毁.

It seems that his flight will crash.
或者可以更加简单的说,
his flight might crash.might就表示了“看起来”,不确定的意思了.
你自己的翻译过于chinglish了一些
或者更加正式一点的话,可以这么说,
it seems that the flight he boarded will crash.