Free one-way premium economy upgrade valid on international inbound flight from Bangkok to London Heathrow only (connecting flights to Bangkok from other Southeast Asia destinations will be in economy class). Flying with EVA Air Bangkok to London Heathrow. Valid for new bookings only, booked between 01 April 2019 and 30 April 2019, on selected fully escorted Southeast Asia tours. Valid for travel 01 April 2019 to 11 July 2019 and from 12 August 2019 to 30 November 2019. Plane configuration, cabin and seat layout may differ depending on route flown and time of travel. Regional departures available with a supplement. Offer can be combined with Loyalty Discount but not with any other offer or promotion. Subject to availability. Offer availble on bookings made over the phone only.