$236 Cheap Flights from Portsmouth (PSM) to Key West (EYW)

View $236 flight on Sat, Sep 13, 2025Opens in a new window

Popular airlines from Portsmouth, NH (PSM-Portsmouth Intl.) to Key West Intl. Airport (EYW)

Cheap Flights from Portsmouth to Key West (PSM-EYW)

Prices were available within the past 7 days and start at $236 for one-way flights and $494 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Breeze Airways
Sat, Aug 23 - Fri, Sep 5
PSM
Portsmouth
EYW
Key West
$494 Roundtrip, found 6 days ago
$494
Roundtrip
found 6 days ago
Select Breeze Airways flight, departing Sat, Aug 23 from Portsmouth to Key West, returning Fri, Sep 5, priced at $494 found 6 days ago
Flights from Portsmouth (PSM) to Key West (EYW)
Origin airport
Portsmouth Intl.
Destination airport
Key West Intl.
Roundtrip price
$494
Distance
1422 mi

Portsmouth to Key West Flights

The cheapest times to fly from Portsmouth to Key West

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 Portsmouth to Key West are during the month of August. You can find some of the cheapest flights from Portsmouth to Key West with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portsmouth to Key West

Sunday is one of the best days to book for cheap flights from Portsmouth to Key West: 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 Portsmouth to Key West

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 Portsmouth to Key West in 2025. You can also book with separate airlines for your outbound and return journeys, from $236 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 Portsmouth to Key West 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 Portsmouth to Key West 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 Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW) cost?
Get a cheap one-way flight from $236 or cheap return flight from $494 from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW)?
Planning your getaway for August can help you save, as it's the cheapest month for flights between PSM and EYW. You'll usually find the lowest prices during off-peak months.
Which airlines fly direct from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW)?
You can't fly direct to Key West Intl. Airport (EYW) from Portsmouth, NH (PSM-Portsmouth Intl.). However, you can arrive in Key West without any layovers by departing from Logan Intl. Airport (BOS).
What is the cheapest airline that flies from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PSM to EYW. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW)?
There aren't any daily direct flights from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW). But you can choose flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from PSM to EYW?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary 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 Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW)?
To land at Key West Intl. Airport (EYW) on time, choose a flight that leaves Portsmouth Intl. Airport (PSM) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW) last-minute?
Holding off until just before your departure to book a flight from PSM to EYW often results in higher prices. While it's possible to find some last-minute discounts, there's no guarantee. Be flexible with your travel plans for the best chance of getting a bargain.
Is it cheaper to book a PSM to EYW flight and hotel package?
Compared with arranging flights and hotels separately, booking a PSM to EYW flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one convenient place will take the hassle out of travel planning. Simply secure your flights and choose from our wide range of hotels, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Portsmouth Intl. Airport (PSM) to Key West Intl. Airport (EYW)?
In most instances, you can modify or cancel your PSM to EYW flight. However, there may be additional fees, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you'd like further details, visit our Customer Service portal.

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*Available to One Key members.