$163 Cheap Flights from St. Thomas (STT) to Washington (IAD)

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St. Thomas to Washington Flights

The cheapest times to fly from St. Thomas to Washington

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

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

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

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 St. Thomas to Washington in 2026. You can also book with separate airlines for your outbound and return journeys, from $163 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 St. Thomas to Washington 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 St. Thomas to Washington 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 St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) cost?

You can find cheap one-way flights from $163 and cheap return flights $320 St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) with Expedia. One-way flights typically cost between $146 and $1101, and return flights often range between $373 and $1946. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) ticket fares go up or down.

*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

What is the cheapest month to fly from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

The cheapest month to fly from STT to IAD is December when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.

Which airlines fly direct from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

You can fly direct from STT to IAD on United, with around 7 flights per week.

What is the cheapest airline that flies from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

United is one of the cheapest airlines offering connecting flights from Cyril E. King (STT) to Washington Dulles Intl. (IAD), with round-trip tickets starting from around $205.34 with a layover in an unspecified location. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.

*Prices based on flights available on Expedia in the last year.

How do I find cheap flights from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

To find a cheap flight from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

What is the best airline to fly with from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

The best airline to fly with from St. Thomas (STT) to Washington, DC (IAD) will differ from traveler to traveler. If you like to fly early, United offers early morning flights. If price is the most important factor, United typically offers the lowest fares. 9K offers the most daily flights from STT to IAD, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

What is the best time to fly from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

How many flights per day from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

You can find approximately 1 nonstop flights per day from Cyril E. King (STT) to Washington Dulles Intl. (IAD). For more options, look at flights that include layovers.

What is the earliest flight from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

The earliest flight from St. Thomas (Cyril E. King) to Washington, DC (Washington Dulles Intl.) typically departs at around 7:45 AM. This seasonal service is operated by airlines like 9K and United, allowing you to start your day early and maximize your time in the capital. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

What are the most popular departure times for flights from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

The most popular departure times for flights from St. Thomas (STT) to Washington, DC (IAD) are in the early afternoon, from 12pm to 3pm. About 54% of passengers prefer this time window. Many major carriers, including United and Delta, offer flights during this window. This timing works well because it allows you to enjoy a leisurely morning before heading to the airport.

How long does it take to fly from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

A nonstop flight from STT to IAD typically takes around 4 hours 30 minutes, covering approximately 1,609 miles. Connecting flights on this route usually add 3 hours 30 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Can you fly business or first class from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

First class seats are offered on the STT to IAD route with United Airlines and Delta Air Lines.

How do I earn miles on a St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) flight with Expedia?

It's easy to earn miles on a St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

What airports do you fly into for Washington from Cyril E. King (STT)?

From Cyril E. King (STT), you can fly into Ronald Reagan Washington National (DCA) and Washington Dulles Intl. (IAD) in Washington. Some flights may connect through major hubs like Luis Munoz Marin Intl. (SJU), Charlotte-Douglas Intl. (CLT), Miami Intl. (MIA) before reaching Washington. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Is it cheaper to buy a plane ticket from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) at the last minute?

Typically, booking a last minute flight from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Is it cheaper to book a St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) flight and hotel package?

Securing a St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) Fairfax County Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

Can I cancel or change the date of my flight from St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.)?

If you booked your St. Thomas (STT-Cyril E. King) to Washington, DC (IAD-Washington Dulles Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.