Just a gentle reminder that if codes are used for ticket types, stations or anything else, these must be the correct codes. We don't allow made-up codes to be posted. Also any such codes should be correctly defined the first time they are used (or a link provided with more information would also be fine)
OPR and SSR are both codes for Super Off Peak Return. I have never seen a flow with both OPR and SSR before, as this would appear as the same name to the customer. Both these ticket types are valid for return travel within a calendar month.
The St Albans to London Thameslink fares do not correspond with what your post says: http://www.brfares.com/#!fares?orig=SAC&dest=4452
Anyway fares do vary a lot, sometimes due to historic reasons but often due to market forces and supply vs demand. It's not as simple as a north vs south thing; there are good and bad value fares within the same geographical areas.
I think you are using the wrong ticket codes.St Albans to London Thameslink = Depends where you class the destination as - but assume central london, 20 miles = £10.10 SDS, £15.20 SOR, £12.60 OPR, £11.10 SSR
OPR and SSR are both codes for Super Off Peak Return. I have never seen a flow with both OPR and SSR before, as this would appear as the same name to the customer. Both these ticket types are valid for return travel within a calendar month.
The St Albans to London Thameslink fares do not correspond with what your post says: http://www.brfares.com/#!fares?orig=SAC&dest=4452
Anyway fares do vary a lot, sometimes due to historic reasons but often due to market forces and supply vs demand. It's not as simple as a north vs south thing; there are good and bad value fares within the same geographical areas.