Air China is a member of Star Alliance and flag carrier of Peope´s Republic of China headquartered at Beijing Capital International Airport. (And secondary hub at Shanghai Pudong) offering its service to over 200 worldwide destinations. They are connecting various cities and countries in Asia and Oceania with European cities such as London, Paris, Frankfurt, Munich, Dusseldorf, Berlin, Zurich, Geneva, Copenhagen, Stockholm, Milan, Rome, Madrid, Vienna, Athens, Budapest and more. If you are looking for budget solution this carrier is usually a good choice although you have to accept only basic onboard service. This carrier has relased new promo sale from European cities to Mongolia from €409. Look for flights departing from Zurich, Paris, Dusseldorf, Frankfurt or Munich..
Firstly note that this promotion with Air China is flash sale available till 30th of November. Travel period is then January to beginning of June 2018. Most of the flights require longer layover in Beijing or Shanghai on your way. Air China is offering free hotel during layover. If interested in this promotion you can follow here to check complete conditions of this offer.
Travel dates is the easiest to compare directly at website of Air China as the website uses flexible search by default.
Booking sample of current Air China promotion: Fly to Mongolia from Zurich €409, Paris €439 or Germany €523..Also as per our booking smaple you would depart from Switzerland to Ulaanbaatar on 10th of June. Your return flight from Asia back to Europe would be then on 24th of June 2018.