How do I switch credit cards and not affect my credit score?

[Floyyd]

I want to get a frequent flyer credit card but I already have 3 credit cards with generous limits. I don't need these credit cards and I would like to cancel them and have this "possible credit" to go towards the new card. I heard once that canceling a credit card has a negitive effect on your credit score. Is this true? If so, how do I switch credit cards and avoid affecting my credit score in a bad way?

[Admin]

opening and closing credit cards is your choice and has nothing to do with your score as long as you close your accounts properly and leave no debts in them.why not aske your creditors about the possibilities they will be glad to answer and not be left with debts.