I think you just got unlucky with dates. The fares are similar.
[KVS Availability Tool 2.1.0/Gold - Sabre: Fares/TCY/CA-CAD]
Code:
DXB Dubai AE [OMDB]
LON London Metro UK = LHR LGW STN LTN LCY
MON 03 Jul 2006
Carrier From To Fare Cur Fare Basis
--------- ------ ---- --------- ---- --------- ---- -- ----------
EK DXB LON 846 CAD QLE3MAE1
EK DXB LON 924 CAD KE3MAE1
EK DXB LON 1079 CAD BLE3MAE1
EK DXB LON 1173 CAD YLEE3M1
EK DXB LON 1173 CAD BEE6MAE1
EK DXB LON 1266 CAD MHE6MAE1
EK DXB LON 1266 CAD MLE6MAE1
EK DXB LON 1422 CAD MRTAE1
EK DXB LON 1531 CAD WRTAE1
EK DXB LON 1733 CAD YRTAE1
EK DXB LON 1889 CAD YLPX2M1
EK DXB LON 1986 CAD YHPX2M1
EK DXB LON 2160 CAD YEE3M1
EK DXB LON 3468 CAD YRT
EK DXB LON 4402 CAD JRT
EK DXB LON 5629 CAD FRT
[KVS Availability Tool 2.1.0/Gold - Sabre: Fares/TCY/CA-CAD]
Code:
LON London Metro UK = LHR LGW STN LTN LCY
DXB Dubai AE [OMDB]
MON 03 Jul 2006
Carrier From To Fare Cur Fare Basis
--------- ------ ---- --------- ---- --------- ---- -- ----------
EK LON DXB 619 CAD TE1YGB1
EK LON DXB 743 CAD LE1YGB1
EK LON DXB 878 CAD QE1YGB1
EK LON DXB 1023 CAD KE1YGB1
EK LON DXB 1270 CAD BE1YGB1
EK LON DXB 1562 CAD MRTGB1
EK LON DXB 1787 CAD WRTGB1
EK LON DXB 2011 CAD YRTGB1
EK LON DXB 2026 CAD YLPX2M
EK LON DXB 2277 CAD YHPX2M
EK LON DXB 2305 CAD CE3MGB1
EK LON DXB 2563 CAD Y2
EK LON DXB 2602 CAD C2E3MGB1
EK LON DXB 3047 CAD YEE3M2
EK LON DXB 3898 CAD J2RTGB1
EK LON DXB 4315 CAD J1RTGB1
EK LON DXB 4315 CAD F2RTGB1
EK LON DXB 4317 CAD YRT
EK LON DXB 4560 CAD JRTGB1
EK LON DXB 5050 CAD F1RTGB1
EK LON DXB 5540 CAD FRTGB1
EK LON DXB 5822 CAD JRT
EK LON DXB 8820 CAD FRT
If you look at the 2 lowest fares on the LON-DXB sector, they are booked in T and L class. These are yet to be introduced on the DXB-LON sector tickets, but they will be soon, so the fares should become similar
Cheers