Cheap flights from Seattle to Koh Samui

Airlines that fly from Seattle to Koh Samui

  • Plan, book, fly with confidence
  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 35% on select hotels after you book a flight*
  • payments icon
    Earn twice
    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Seattle (SEA) to Koh Samui (USM)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat., 4 Jan. - Sat., 11 Jan.
SEA
Seattle
USM
Koh Samui
NZ$2,808 Return, found 1 day ago
NZ$2,808
Return
found 1 day ago
Select United flight, departing Sat., 4 Jan. from Seattle to Koh Samui, returning Sat., 11 Jan., priced at NZ$2,808 found 1 day ago
EVA Airways
Sat., 4 Jan. - Sat., 11 Jan.
SEA
Seattle
USM
Koh Samui
NZ$2,906 Return, found 1 day ago
NZ$2,906
Return
found 1 day ago
Select EVA Airways flight, departing Sat., 4 Jan. from Seattle to Koh Samui, returning Sat., 11 Jan., priced at NZ$2,906 found 1 day ago
EVA Airways
Sat., 4 Jan. - Sat., 11 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,008 Return, found 1 day ago
NZ$3,008
Return
found 1 day ago
Select EVA Airways flight, departing Sat., 4 Jan. from Seattle to Koh Samui, returning Sat., 11 Jan., priced at NZ$3,008 found 1 day ago
EVA Airways
Sat., 4 Jan. - Sat., 11 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,050 Return, found 1 day ago
NZ$3,050
Return
found 1 day ago
Select EVA Airways flight, departing Sat., 4 Jan. from Seattle to Koh Samui, returning Sat., 11 Jan., priced at NZ$3,050 found 1 day ago
EVA Airways
Sat., 4 Jan. - Sat., 11 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,152 Return, found 1 day ago
NZ$3,152
Return
found 1 day ago
Select EVA Airways flight, departing Sat., 4 Jan. from Seattle to Koh Samui, returning Sat., 11 Jan., priced at NZ$3,152 found 1 day ago
China Airlines
Fri., 3 Jan. - Fri., 10 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,185 Return, found 2 days ago
NZ$3,185
Return
found 2 days ago
Select China Airlines flight, departing Fri., 3 Jan. from Seattle to Koh Samui, returning Fri., 10 Jan., priced at NZ$3,185 found 2 days ago
EVA Airways
Fri., 3 Jan. - Fri., 10 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,271 Return, found 2 days ago
NZ$3,271
Return
found 2 days ago
Select EVA Airways flight, departing Fri., 3 Jan. from Seattle to Koh Samui, returning Fri., 10 Jan., priced at NZ$3,271 found 2 days ago
EVA Airways
Fri., 3 Jan. - Fri., 10 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,287 Return, found 2 days ago
NZ$3,287
Return
found 2 days ago
Select EVA Airways flight, departing Fri., 3 Jan. from Seattle to Koh Samui, returning Fri., 10 Jan., priced at NZ$3,287 found 2 days ago
EVA Airways
Wed., 1 Jan. - Wed., 8 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,305 Return, found 4 days ago
NZ$3,305
Return
found 4 days ago
Select EVA Airways flight, departing Wed., 1 Jan. from Seattle to Koh Samui, returning Wed., 8 Jan., priced at NZ$3,305 found 4 days ago
EVA Airways
Wed., 1 Jan. - Wed., 8 Jan.
SEA
Seattle
USM
Koh Samui
NZ$3,322 Return, found 4 days ago
NZ$3,322
Return
found 4 days ago
Select EVA Airways flight, departing Wed., 1 Jan. from Seattle to Koh Samui, returning Wed., 8 Jan., priced at NZ$3,322 found 4 days ago
Beautiful view of the beach with palm trees

Black Friday: Members save 30%+

Members save 30%+ on selected hotels until 4 Dec (property time) with our Black Friday deals. Stay by 15 Dec 2025.
Unlock Black Friday deals
*Available to Expedia members.