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

Popular airlines from Portsmouth, NH (PSM-Portsmouth Intl.) to St. Thomas (SPB-St. Thomas Seaplane Base)

Flights from Portsmouth (PSM) to St. Thomas (SPB)
Origin airport
Portsmouth Intl.
Destination airport
St. Thomas Seaplane Base
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 St. Thomas Seaplane Base Airport (SPB) cost?
Get a cheap one-way flight or cheap return flight from Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB)?
is the cheapest month to fly from PSM to SPB. Traveling during quieter months is often the key to landing a great deal.
What is the cheapest airline that flies from Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB)?
To find the cheapest airline flying from PSM to SPB, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB)?
There are no daily nonstop flights available from Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from PSM to SPB?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary depending on a number of factors, such as the time of year 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 St. Thomas Seaplane Base Airport (SPB)?
To avoid possible delays on the Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB) route, travel before 3 PM. Later flights have a 22% higher chance of being 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 St. Thomas Seaplane Base Airport (SPB) last-minute?
Holding off until right before your break to book your flight from PSM to SPB often results in higher prices. While you may come across some last-minute offers, there's no guarantee. Keep your travel plans flexible for a better chance of scoring a bargain.
Is it cheaper to book a PSM to SPB flight and hotel package?
Compared with arranging flights and hotels separately, booking a PSM to SPB flight and hotel package with Expedia could lead to significant savings. Better yet, managing everything in one place will take the hassle out of planning your trip. Simply pick your flights and choose from our wide range of stays, then tailor your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Portsmouth Intl. Airport (PSM) to St. Thomas Seaplane Base Airport (SPB)?
In most cases, you're able to cancel or reschedule your PSM to SPB flight. However, additional fees may apply, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you need further details, go to our Customer Service portal.

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*Available to One Key members.