The nominal fare difference on a roundtrip booking varies anywhere between $220 for 30-day AP roundtrip V fares (if you meet Sat stay min stay requirements for them) to $130 roundtrip for one-way fares (if you don't meet min stay requirements). The roundtrip fare filings have an 'F' in second position of fare basis code, while one-way fares have an 'A' there.

The increase in differential for 30-day AP roundtrip V fares was solely due to dropping the roundtrip Basic fare price from $228 to $168 roundtrip as seen below. The 30-day AP roundtrip V Main fares have remained stable at $388. Pricing on one-way 30-day AP V fares have also remained stable at $153 each-way for Basic and $218 each-way for Main (for $65 difference on one-way bookings and $130 on roundtrips). Other one-way fares have same $65 each-way differential. For 21-day and shorter AP roundtrip fares, the differentials are $160 on a roundtrip booking.