Cheapest return flights from Seattle to Denver in April from $70

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

Return flights

21 Apr - 26 Apr Frontier Airlines direct
16 Apr - 19 Apr Frontier Airlines direct
23 Apr - 26 Apr Frontier Airlines direct
17 Apr - 19 Apr Frontier Airlines direct
24 Apr - 26 Apr Frontier Airlines direct
30 Apr - 04 May Frontier Airlines direct
30 Apr - 01 May Frontier Airlines direct
10 Apr - 14 Apr Frontier Airlines direct
30 Apr - 02 May Frontier Airlines direct
16 Apr - 03 May Frontier Airlines direct
30 Apr - 03 May Frontier Airlines direct
30 Apr - 12 May Frontier Airlines direct
23 Apr - 23 Apr Frontier Airlines
30 Apr - 30 Apr Frontier Airlines
04 Apr - 06 Apr Alaska Airlines direct
03 Apr - 08 Apr United direct

Also check the deals for one-way flights from Seattle to Denver in April.

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