--I've been looking at round trip travel from BOS -> MUC in sept/oct this year. Much to my frustration, on CO.com, I can see flights I like (W fares), but on united.com the exact same itinerary (same times, flight numbers) are only available with H fares ($400 more per person).

Now the really weird part. If I do multi-city instead of roundtrip on united.com... I can get W fares! Same price as co.com! My question is WHY? All the dates, flight times and flight numbers are exactly the same.