$68 Find Cheap Frontier Flights from Denver to Seattle

Generally, when trying to get a below average price for your ticket, try to book around 12 days before departure. For the cheapest possible price, our data suggests booking 55 days before departure.

Yes, based on our data, Frontier is the cheapest airline to fly the route with an average price of $142 return. The next cheapest options are Southwest and Delta, with return flights costing on average $211 and $235 respectively.

In the last 3 days, the lowest price for a flight with Frontier from Denver to Seattle was $135 for a return flight and $78 for a one-way flight.

Yes, Frontier does offer direct flights for the route, with around 4 flights per week.

On average, the cheapest day of the week to fly from Denver to Seattle with Frontier is Monday, when prices are around $25. The most expensive day is generally Thursday, where the average price is around $40.

The cheapest month for Frontier flights to Seattle from Denver is generally September, where plane tickets cost $64 on average. If possible, try to avoid the most expensive months of December and January, where tickets cost $119 and $123 respectively.