It’s generally more expensive to depart on a Tuesday, 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 June. For low rates, September can be a great choice for travel to Grand Forks. Flights to Grand Forks from Chicago-O'Hare Intl in September are about $459 on average during September, but can be found for as low as $129.
Unlike at noon, when flights are generally more expensive, you can save up to 6% on flights from Chicago-O'Hare Intl to Grand Forks by exploring options for tickets in the morning.