AirHint found the following cheapest return flights from Seattle (SEA) to Singapore (SIN) in June 2025 (see full year).

Return flights

17 Jun - 22 Jun	Air Canada
15 Jun - 15 Jul	Air Canada
19 Jun - 26 Jun	Air Canada
29 Jun - 05 Jul	Asiana Airlines
25 Jun - 30 Jun	Asiana Airlines
16 Jun - 21 Jun	China Eastern
18 Jun - 25 Jun	China Eastern
16 Jun - 24 Jun	Korean Air
26 Jun - 17 Jul	Air Canada
25 Jun - 16 Jul	United
17 Jun - 16 Jul	United
14 Jun - 22 Jun	United
26 Jun - 10 Jul	Air Canada
14 Jun - 04 Jul	ANA
27 Jun - 04 Jul	Asiana Airlines
19 Jun - 18 Jul	United
26 Jun - 10 Jul	Singapore Airlines	direct
19 Jun - 26 Jun	Singapore Airlines	direct
17 Jun - 22 Jun	Singapore Airlines	direct
14 Jun - 22 Jun	Singapore Airlines	direct

Also check the deals for one-way flights from Seattle to Singapore in June.

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 Singapore in June from $779

Return flights