Full answer
Cancelling Netflix takes under two minutes if you know where to look. Log in at netflix.com, click your profile icon in the top-right corner, then select Account from the dropdown.
On the Account page, scroll to the Membership & Billing section and click Cancel Membership. Netflix will show you what date your access ends — it's always the last day of the billing cycle you already paid for.
If you subscribed through the iOS App Store or Google Play, you cannot cancel through netflix.com. You must cancel directly through Apple's Subscriptions settings or the Google Play subscriptions page respectively.
Netflix does not charge a cancellation fee and does not require you to call anyone. Your watch history, My List, and profile settings are saved for 10 months, so reactivating later restores everything.