It’s generally more expensive to depart on a Monday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.
Due to multiple factors, expect to potentially pay more when booking in July. For low rates, April can be a great choice for travel to Duluth. Flights to Duluth from Spokane in April are about $337 on average during April, but can be found for as low as $176.
When flying from Spokane to Duluth, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 44% versus a flight in the morning.