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The easiest language to be learned online is English because most of contents online are writen in English. Although It doesn't give significant role for Speaking, however it gives enough ways to learn about Reading, Writing and Listening. For Speaking usually needs to join online course and there are also many online course for Speaking English since English is as official International language which has many entusiasts around the world.
It depends on languages you speak, like if you know French, then the Italian language would be easy to learn. If you know Spanish, then the Portuguese language would be very easy to learn...etc.
But in general, the easiest languages are the languages that don't contains a lot of accents and unpracticed letters pronounciations.
Good Luck
English and deutch mainly because they are close in meaning also writing
English
Arabic.............................................
English is the easiest language to learn either online or offline
Only English which can be easily learn online, because90% material is available in English.