Buy BTC using your card and then convert btc to LTC using any good exchange, I don't think so currently there is any good website for LTC purchase using a credit card.
Yes, but it this way I'm losing like 5 - 7% (first % I will lose on exchanging $ to btc around 3% and +1% on transfer , then will lose 2 - 3% on exchanging btc to ltc.)