Cheapest return flights from Seattle (SEA) to Denver (DEN), October

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
10 Oct 14 Oct Frontier Airlines
Direct Flight
28 Oct 18 Nov Frontier Airlines
Direct Flight
02 Oct 04 Oct Frontier Airlines
Direct Flight
02 Oct 05 Oct Frontier Airlines
Direct Flight
15 Oct 20 Oct Frontier Airlines
Direct Flight
20 Oct 21 Oct Frontier Airlines
09 Oct 12 Oct Frontier Airlines
Direct Flight
29 Oct 02 Nov Frontier Airlines
Direct Flight
29 Oct 01 Nov Frontier Airlines
Direct Flight
20 Oct 21 Oct Frontier Airlines
Direct Flight
15 Oct 19 Oct Frontier Airlines
Direct Flight
14 Oct 18 Oct Frontier Airlines
Direct Flight
12 Oct 23 Oct Frontier Airlines
Direct Flight
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deals for one-way flights from Seattle to Denver in October.

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Updated Jun 28, 2026.

About these fares

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