Hello, which one is correct?

Can I ask you FOR a favor?

or

Can I ask you A favor?

Thanks!

Question

Hello, which one is correct?

Can I ask you FOR  a favor?

or

Can I ask you A favor?

Thanks!

Answer

I´d say, "Please could you do me a favor?" I think it sounds more natural, because i´ve had that doubt like you as well.

Answer

Better than the second is:
Can I ask a favor of you?

This and the first are both natural and correct, with similar meanings.

Answer

It may theoretically be correct either way, but in contemporary English everyone uses the preposition "for". This is the phrasal verb, "to ask for" (pedir). Without "for", it is just "to ask" (preguntar).

Answer

There may be regional differences because here I would say can I ask you for a favour

Answer

Can I ask you a favour?

Or if you want to ask it more politely, you can say:

Could I ask you to do me a favour, please?

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