That's the lowest price we could find for select routes by at least $125. Buy Now at DealBase Tips On the DealBase landing page, click "Hainan AIr" in the top line to see this sale. We found this price on flights departing from Seattle, WA (SEA) with arrival in Beijing (PEK) on February 21 and return on February 26. Book this travel deal by March 31 for travel through June 30. All prices, dates, and booking details were valid at the time of publication.