Traveling from OKC-LAX, LAX-BKK (Bangkok). Round trip, I am looking for the cheapest fare. I dont have a credit card that offers any sort of miles program. Should I start one and put this flight on it? I really dont have much use for a credit card other than taking out emergency cash but I was wondering if it would be beneficial for me to get one before I buy my plane ticket thailand. Thanks in advance!!!!!