My endowment policy has 6 yrs to run, how much am i likely to get if i sell it online?

Hi Arnie47 and welcome to the forum.

Only an endowment buying company can quote you on this. I have heard figures quoted of up to 40% more than a surrender quote but I think that's very optimistic.

Your decision should be based on the urgency and usefulness of the money now and having due consideration for the projected maturity value. If the policy is old enough to enjoy Life Assurance Premium Relief at source, it would be a shame to lose that over the next six years.

There may also be the possibility of taking a loan from the endowment company which is paid back from the maturity value less the loan plus agreed interest. Otherwise, I think you can only apply to the buying companies for quotes:

http://www.money.co.uk/selling-endowments/all-selling-endowments.htm