To save up to 44% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Marquette to Heathrow from $910 1-2 weeks out and tickets from $1,146 for flights departing within the next 72 hours.
Flights from Marquette to Heathrow lean towards being more expensive in July. Prices are generally better when you fly from Marquette to Heathrow in October, with the cheapest ticket starting at $445.