Cheapest one-way flights from Seattle (SEA) to Denver (DEN), August

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
25 Aug Frontier Airlines
Direct Flight
26 Aug Frontier Airlines
Direct Flight
31 Aug Frontier Airlines
Direct Flight
28 Aug Frontier Airlines
Direct Flight
22 Aug Frontier Airlines
Direct Flight
04 Aug Frontier Airlines
Direct Flight
05 Aug Frontier Airlines
Direct Flight
23 Aug Frontier Airlines
09 Aug Frontier Airlines
11 Aug Frontier Airlines
Direct Flight
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deals for return flights from Seattle to Denver in August.

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Updated Jul 15, 2026.

About these fares

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