Sorry for the delay in my response, does it sound ok in an informal letter?
Are these fine ?
Sorry for the delay in my reply/ replying your letter
Sorry for not replying sooner/ for the delayed response/ my late reply

Thank you /

Question

Sorry for the delay in my response, does it sound ok in an informal letter?
Are these fine ?
Sorry for the delay in my reply/ replying your letter
Sorry for not replying sooner/ for the delayed response/ my late reply

Thank you /

Answer

The best ones would be "Sorry for not replying sooner" or "Sorry for the delayed response". They sound the most natural!

Also, when you say "replying your letter" you need to say "replying TO your letter".

:)

Answer

The best ones would be "Sorry for not replying sooner" or "Sorry for the delayed response". They sound the most natural!

Also, when you say "replying your letter" you need to say "replying TO your letter".

:)