Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado Springs to Duluth as you normally would.
To save up to 16% on this flight, we recommend booking at least 42 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Colorado Springs to Duluth from $357 1-2 weeks out and tickets from $361 for flights departing within the next 72 hours.
Flights from Colorado Springs to Duluth lean towards being more expensive in May. Prices are generally better when you fly from Colorado Springs to Duluth in October, with the cheapest ticket starting at $161.