Favorable and favourable are both English terms. Usage Favorable is predominantly used in 🇺🇸 American (US) English (en-US) while favourable is predominantly used in 🇬🇧 British English (used in UK/AU/NZ) (en-GB).

Both 'favorable' and 'favourable' are correct spellings of the same word, with 'favorable' being the American English spelling and 'favourable' being the British English spelling. The choice between the two depends on the English variant you are using.

In UK English, “favourite” and “favourable” (with a “u”) are standard. In US English, “favorite” and “favorable” (with no “u”) are correct.

Just like here in Canada, British English will prefer the “our” version of words like this. So, in the UK, “favour” will be more acceptable, although you’d be fine with either, as both are correct. Also, Australia and New Zealand use the spelling of “favour.”