*see UPDATE below* Fans of an open jaw tickets have some good option to explore Japan and visit Rome, Paris or London on your way. Based on Russian flag carrier Aeroflot you can book open jaw flights on route Rome / Paris - Tokyo - London already for £280 (€312). Very limited availability in first quarter of 2017 though.. This is including all charges and fees and checked luggage..
*UPDATE*.: Now even cheaper and also available for flights over summer holidays 2017! The cheapest open jaw flights to Japan are now available already for £251 (€282). Check updated booking and travel date samples.
As mentioned very limited options are available between April and September 2017. (Including flights over summer holidays in July and August). Flights with Aeroflot have one short layover in Moscow. Below you can refer to booking as well as travel date samples.
Booking samples
Travel samples from Rome
19.4. - 6.5.
26.4. - 8.5.
10. - 20.5.
7. - 24.6.
12. - 29.7.
26.7. - 12.8.
2. - 19.8.
16. - 28.8.
Travel samples from Paris
27.4. - 13.5.
13. - 27.5.
3. - 17.6.
If you need an accommodation in Rome, Paris, London or Tokyo we recommend Booking.com or consider following promo codes that offer Hotels.com, Hotelopia or Venere.
Booking sample of cheap open jaw flights Rome / Paris - Tokyo - London from £251 (€282) here. In this case you would fly from Italy to Japan on 26th of July 2017. Your return flight from Asia back to UK would be on 12th of August 2017.