Seattle to Haikou Flights from HKD 551 incl. tax

Based on HopeGoo data, Singapore Airlines offers one-way fares as low as US$355 on Cheapest nonstop routes (e.g. SEA to HAK on Sun, Apr 19), while Cathay Pacific offers Cheapest nonstop round-trips from US$699 departing on Thu, Apr 30 and returning on Wed, May 6.

It takes about 19 hours 40 minutes to fly from Seattle to Haikou.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Seattle to Haikou is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Seattle to Haikou, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sun, Apr 19, with one-way flights priced at just US$355. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Hainan Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Haikou travel is around December. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Seattle to Haikou is September, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Seattle to Haikou on March 12, 2026 with Hainan Airlines, with prices starting at US$825.

The time difference between Haikou and Seattle is 16h.

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