US Airways changed their pricing scheme several months ago: They no longer offer lower fares for round-trip travel. Because they charge a fee for changing reservations and because last-minute fares are often higher, travelers should consider booking individual one-way reservations instead of round-trip or multi-segment itineraries.
This rule applies to any airline that prices trips as the sum of as individual origin-destination trips - and is especially important for cheap flights.
1. US Airways now prices flights on an individual origin-destination trip basis, without any discounts for round-trips (or Saturday night stay-overs, or any other factor involving combination of origin-destination trips).
2. US Airways charges a $150 change fee for changing a reservation.
3. If you miss flying a segment of a reservation, US Airways (like all airlines) cancels the rest of your reservation.
4. If the trips are booked together as one reservation and you have to change a segment, that will require a re-pricing of the whole itinerary at the time of the change. If that's done near the flight date, it may result in a much higher total fare.
5. If the trips are all booked individually, you can keep the unchanged trips at their original fare; not using any individual segment will not affect the other reservations. So, if you have to change or not fly any segment of a reservation, it may be cheaper to just throw away the original ticket for that segment and pay for a new ticket for the segment than pay the change fee to recoup the fare paid for that segment.
Be sure to check that the sum of individual one-trip tickets is the same as a round-trip ticket for your planned itinerary. It may take a few more minutes to do this checking and book individual trips, but when you have to change a segment, it could save a lot of money!