I've just finished reading Lying by Sam Harris, and would strongly advise you to do the same.
In it he (successfully to me at least) argues that lying, even white lies, are things to be avoided.
It only costs £2, well worth the investment* and you need only set aside 45 minutes reading time (and probably a bit of thinking time after).
I generally think of myself as a very honest person. However, following reading this, I going to take up Sam Harris and resolve to not lie again. I hope that I don't find this too much of a challenge!
The only caveat I can think of with white lies is when using them to surprise someone. I once lied about going for a run, so that I could pay a surprise visit to my (not at the time) ex. The deceit allowed me the time to drive and not reply to texts etc. which I would otherwise do. However, I think this falls into a category not mentioned by Harris - telling a lie, but with the ultimate aim of revealing the deceit later. Of course Walter Scott is right when he says "Oh what a tangled web we weave, When first we practise to deceive!" - would these kind of lies make it easier to tell lies in general? Are these the only lies worth telling? I don't know. It's easy to think of how the potential negatives from this deceit (imagine that there had been a car crash and I had died - my last communication would have been a lie. This may be an extreme, but it's well within the realms of possibility) could out weigh any positives
*If you email me, I can send it to you for free. Sam Harris says he's happy for digital/physical copies to be shared with others, but does ask that if you received your copy for free, that you buy your own copy before passing yours on. You might also like to read "The future of the book" from Sam Harris' blog.