Flights to San Juan Island from St. Louis - ￥17,400

View ￥17,400 flight on Sat, Aug 30, 2025Opens in a new window

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Cheap Flights from St. Louis to San Juan Island (STL-SEA)

Prices were available within the past 7 days and start at ￥17,400 for one-way flights and ￥38,050 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Aug 30 - Sun, Aug 31
STL
St. Louis
SEA
Seattle
￥38,050 Roundtrip, found 11 hours ago
￥38,050
Roundtrip
found 11 hours ago
Select Delta flight, departing Sat, Aug 30 from St. Louis to Seattle, returning Sun, Aug 31, priced at ￥38,050 found 11 hours ago
United
Sat, Aug 30 - Sun, Aug 31
STL
St. Louis
SEA
Seattle
￥39,540 Roundtrip, found 11 hours ago
￥39,540
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Aug 30 from St. Louis to Seattle, returning Sun, Aug 31, priced at ￥39,540 found 11 hours ago
United
Sat, Aug 30 - Sun, Aug 31
STL
St. Louis
SEA
Seattle
￥44,390 Roundtrip, found 11 hours ago
￥44,390
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Aug 30 from St. Louis to Seattle, returning Sun, Aug 31, priced at ￥44,390 found 11 hours ago
Delta
Sat, Aug 30 - Sun, Aug 31
STL
St. Louis
SEA
Seattle
￥48,580 Roundtrip, found 11 hours ago
￥48,580
Roundtrip
found 11 hours ago
Select Delta flight, departing Sat, Aug 30 from St. Louis to Seattle, returning Sun, Aug 31, priced at ￥48,580 found 11 hours ago
American Airlines
Sat, Aug 30 - Sun, Aug 31
STL
St. Louis
SEA
Seattle
￥49,080 Roundtrip, found 11 hours ago
￥49,080
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Sat, Aug 30 from St. Louis to Seattle, returning Sun, Aug 31, priced at ￥49,080 found 11 hours ago
American Airlines
Sat, Aug 30 - Sun, Aug 31
STL
St. Louis
SEA
Seattle
￥49,440 Roundtrip, found 11 hours ago
￥49,440
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Sat, Aug 30 from St. Louis to Seattle, returning Sun, Aug 31, priced at ￥49,440 found 11 hours ago
*Available to Expedia members.