My flight was cancelled due to an airline's strike.
My flight was cancelled because of an airline's strike.
My flight was called off due to an airline's strike.
due to/because of ～ ～(が原因)のために
※この後に続く～の部分は名詞
strike ストライキ
call off 中止する
例文3つとも意味は同じで、
「航空会社のストライキにより、フライトはキャンセルされました。」です。
I couldn't get back to Japan due to an airline's strike.
航空会社のストライキのために、日本に帰国できませんでした。
Due to the airline being on strike, my flight was cancelled
My flight has been cancelled due to an airline strike
Due airline staff being on strike, flights have been cancelled
ストライク - go on strike, to strike
“I am going on strike”
“Bus drivers are going on strike”
“The airline staff are on strike”
ストライク中 - on strike, being on strike
ストライクで, ストライクのせい, ストライクのため - because of a strike, due to a strike
フライトはキャンセルになった - flight has been cancelled, my flight has been cancelled
帰れなかった時 - I couldn’t get back to japan, because my flight was cancelled due to an airline strike
日本 
イギリス 
