Cheapest one-way flights from Seattle to Denver in April from $33

AirHint found the following cheapest one-way flights from Seattle (SEA) to Denver (DEN) in April 2026 (see full year).

One-Way flights

18 Apr Frontier Airlines direct
24 Apr Frontier Airlines direct
16 Apr Frontier Airlines direct
17 Apr Frontier Airlines direct
19 Apr Frontier Airlines direct
15 Apr Frontier Airlines direct
04 Apr Alaska Airlines direct

Also check the deals for return flights from Seattle to Denver in April.

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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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