Book a stay at the Fairfield Inn & Suites by Marriott Marathon Florida Keys with prices from $109 per night at Travelzoo. We found the best price on stays through September in a king or two queen room. There's no resort fee and you'll get free breakfast. October stays are $139 per night, and November-December stays are $149 per night. Need to cancel? Do so by 3 pm local time at least 7 days prior to arrival. Taxes, fees, and exclusions apply.