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.
To save up to 38% on this flight, we recommend booking at least 51 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Great Falls to London from $813 1-2 weeks out and tickets from $886 for flights departing within the next 72 hours.
February can be a great time to fly to London from Great Falls with a flight ticket averaging about $634. Cheapflights users have found deals in the month of February for as cheap as $394. The most expensive prices can be found in the month of June.