Originally Posted by
alex67500
Refunds like that will never be exactly 50% per leg. Even if the fare was 50/50, you'd have government taxes and airport charges which may differ (APD adds a lot for UK departures).
Indeed - to take a random example, I've priced LHR-ARN//OSL-LHR for travel on 17 and 28 February. The ITA quote is for a total of £224.27 broken down as:
Fare 1: Carrier BA ISPM0V2R LON to STO £77.00
Fare 2: Carrier BA ISPM0V2R OSL to LON £83.00
United Kingdom Air Passenger Duty APD (GB) £26.00
United Kingdom Passenger Service Charge Departures (UB) £22.07
Norway Air Passenger Tax (G2) £6.70
Norway Passenger Charge (ZN) £9.50
Subtotal per passenger £224.27
If only OSL-LHR were being refunded, I would expect it to be the total of the three bolded lines. £83.00 + £6.70 + £9.50 = £99.20, or 44.2% of the total paid.
(The GDS fee doesn't matter for the purposes of this example, although it would matter for anyone who takes the precaution of printing the ITA fare breakdown and full fare rules whenever they buy a published fare ticket.)