Currently you are able to watch "Darkest Hour" streaming on Jio Cinema or rent it on Amazon Video online.
There are no options to watch Darkest Hour for free online today in India. You can select 'Free' and hit the notification bell to be notified when movie is available to watch for free on streaming services and TV.
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In May 1940, the fate of World War II hangs on Winston Churchill, who must decide whether to negotiate with Adolf Hitler or fight on knowing that it could mean the end of the British Empire.