Cheap Flights from Jacksonville (JAX) to Marathon (MTH)

Popular airlines from Jacksonville International Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon)

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Find available prices by choosing your travel dates.
Flights from Jacksonville (JAX) to Marathon (MTH)
Origin airport
Jacksonville Intl.
Destination airport
Florida Keys Marathon
Distance
400 mi

Jacksonville to Marathon Flights

The cheapest times to fly from Jacksonville to Marathon

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Jacksonville to Marathon are during the month of . You can find some of the cheapest flights from Jacksonville to Marathon with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Jacksonville to Marathon

Sunday is one of the best days to book for cheap flights from Jacksonville to Marathon: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Jacksonville to Marathon

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Jacksonville to Marathon in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Jacksonville to Marathon flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Jacksonville to Marathon airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon) cost?
Discover the latest flight deals from JAX to MTH by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from JAX to MTH?
The cheapest flights from JAX to MTH are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from JAX to MTH?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from JAX to MTH. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon)?
Direct flights from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon) aren’t available daily, so you’ll need to take a flight with a layover. Explore your options with Expedia’s filters. Enter your travel details and select either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from JAX to MTH?
You’ll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon)?
Book a flight from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon) that leaves before 3 PM to reduce the risk of delays and cancellations. Later departures are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
Is it cheaper to buy a plane ticket from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon) last-minute?
Holding off until just before your departure to book your flight from JAX to MTH often results in higher prices. While it’s possible to find some last-minute offers, there’s no guarantee. Allow some flexibility in your schedule for a better chance of snagging a bargain.
Can I cancel or change the date of my flight from Jacksonville Intl. Airport (JAX) to Marathon, FL (MTH-Florida Keys Marathon)?
In most cases, you can reschedule or cancel your JAX to MTH flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline’s fees and guidelines on flight changes, or if you want more details, visit our Customer Service portal.

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*Available to One Key members.