Cheap Flights from Portsmouth (PSM) to St. Thomas (STT)

Popular airlines from Portsmouth, NH (PSM-Portsmouth Intl.) to Cyril E. King Airport (STT)

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Flights from Portsmouth (PSM) to St. Thomas (STT)
Origin airport
Portsmouth Intl.
Destination airport
Cyril E. King
Distance
1743 mi

Portsmouth to St. Thomas Flights

The cheapest times to fly from Portsmouth to St. Thomas

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

 

The best time to book a flight from Portsmouth to St. Thomas

Sunday is one of the best days to book for cheap flights from Portsmouth to St. Thomas: 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 St. Thomas

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 St. Thomas 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 Portsmouth to St. Thomas 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 St. Thomas 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 Cyril E. King Airport (STT) cost?
Discover the latest flight deals from PSM to STT 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 PSM to STT?
The cheapest flights from PSM to STT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Portsmouth Intl. Airport (PSM) to Cyril E. King Airport (STT)?
Although Portsmouth, NH (PSM-Portsmouth Intl.) doesn't offer any direct flights to Cyril E. King Airport (STT), other airports have nonstop options. Jetting off from Logan Intl. Airport (BOS) will get you to St. Thomas without any layovers.
What is the cheapest airline that flies from PSM to STT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PSM to STT. 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 Cyril E. King Airport (STT)?
Nonstop flights from Portsmouth Intl. Airport (PSM) to Cyril E. King Airport (STT) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from PSM to STT?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary based on various factors, such as the season and airline.*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 Cyril E. King Airport (STT)?
To avoid possible delays on the Portsmouth Intl. Airport (PSM) to Cyril E. King Airport (STT) route, travel before 3 PM. Later flights are 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 Portsmouth Intl. Airport (PSM) to Cyril E. King Airport (STT) last-minute?
Last-minute bookings from PSM to STT are typically more expensive. For the lowest prices, start searching for flights ahead of time. That being said, if your travel plans are flexible, you may land a cheap fare right before your trip.
Is it cheaper to book a PSM to STT flight and hotel package?
You can save money by securing a PSM to STT flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've chosen your ideal flights and accommodations, consider adding extras such as tours, activities and car rentals.
Can I cancel or change the date of my flight from Portsmouth Intl. Airport (PSM) to Cyril E. King Airport (STT)?
Typically, you can modify or cancel your PSM to STT flight. However, there may be additional fees, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you want further information, visit our Customer Service portal.

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*Available to One Key members.