Book a roundtrip with a Saturday night stay over, and you should find fares of $298 + tax = $314.50. Throw away the return.

If you want to use miles, book a roundtrip. 25,000 miles.

Your choice.

Airline pricing has nothing to do with how many miles you're going. It's about supply and demand for each market. And fare rules. They don't discount one-way fare, but they do on roundtrips.

Onepass rewards are based on roundtrip travel. You cannot just get a one-way for 12,500 miles.