Cheapest one-way flights from Seattle to Denver in June from $116

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

One-Way flights

20 Jun United direct
10 Jun Delta direct
18 Jun United direct
08 Jun Alaska Airlines direct
05 Jun Alaska Airlines direct
01 Jun Alaska Airlines direct
07 Jun United direct
14 Jun United direct
26 Jun United
26 Jun Delta direct

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

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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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