AirHint found the following cheapest return flights from Seattle (SEA) to Manila (MNL) in August 2025 (see full year).

Return flights

13 Aug - 31 Aug	Korean Air
17 Aug - 24 Aug	Asiana Airlines
06 Aug - 14 Aug	Korean Air
12 Aug - 19 Aug	Korean Air
10 Aug - 19 Aug	Korean Air
06 Aug - 15 Aug	Korean Air
01 Aug - 07 Sep	Korean Air
15 Aug - 29 Aug	Korean Air
08 Aug - 07 Sep	Korean Air
16 Aug - 22 Aug	Korean Air
13 Aug - 31 Aug	Philippine Airlines	direct
15 Aug - 29 Aug	Philippine Airlines	direct
01 Aug - 07 Sep	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 604€

Return flights