AirHint found the following cheapest return flights from Seattle (SEA) to Manila (MNL) in August 2026 (see full year).

Return flights

21 Aug - 16 Sep	United
12 Aug - 19 Aug	Philippine Airlines	direct
05 Aug - 26 Aug	Cathay Pacific
12 Aug - 18 Aug	China Airlines
11 Aug - 20 Aug	Cathay Pacific
12 Aug - 18 Aug	Philippine Airlines	direct
05 Aug - 26 Aug	Philippine Airlines	direct

Also check the deals for one-way flights from Seattle to Manila in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seattle to Manila in August from 653€

Return flights