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Beginning April 1, Cathay Pacific will launch a nonstop service several times a week. Not sure if Asiana is responding to that news by having you secure this fare now.
Asiana Airlines have round trip airfares travelling from Seattle (SEA) to Hong Kong (HKG) for $ 507-$ 536, making one stop in South Korea. This is the lowest I’ve seen posted here. See both my samples from Skyscanner [skyscanner.com].
Travel Availability:
Departs SEA: Sunday, Monday, Tuesday, Wednesday or Thursday beginning Oct 21 thru Dec 4 and then again (same days of the week) from Jan 6 thru May 5, 2019