Originally Posted by
Repooc17
If you want to estimate, usually the distance ratio between the UA segment and all segments multiply by the underlying fare paid excluding taxes/fees.
Sometimes. Sometimes not. This can go in many different ways including a significant shorting of the UA flight segment. Here is a UA flight credit for BOS-LHR on a BOS-LHR-FRA 220 ticket ... and no ... it was not THAT cheap ...