Cheap Flights from Washington (IAD) to Cascais (CAT)

Popular airlines from Washington Dulles Intl. Airport (IAD) to Cascais (CAT)

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Alternative airports near Cascais

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Humberto Delgado LIS. Cheapest option available. Average driving time to city center is 24 minutes. Flights from $741
LIS
Humberto Delgado
Cheapest
Average driving time to city center24 min
Flights from $741

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT) cost?
Snag a cheap one-way flight or cheap return flight from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT) 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 Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT)?
is the least expensive month to fly from IAD to CAT. Timing your trip outside of the busy season is often the key to better flight prices.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest IAD to CAT flight.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT)?
Direct flights from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from IAD to CAT?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change based on various factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT)?
To reach Cascais Airport (CAT) on time, opt for a flight that takes off from Washington Dulles Intl. Airport (IAD) before 3 PM. The likelihood 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.
What airports do you fly into for Lisbon District from Washington Dulles Intl. Airport (IAD)?
If you're flying on a direct flight from Washington Dulles Intl. Airport (IAD) to Lisbon District, Humberto Delgado Airport (LIS) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT) last-minute?
Booking your plane ticket from IAD to CAT right before your journey is generally more expensive. But if you're flexible with your schedule, you could score a cheap last-minute fare.
Is it cheaper to book an IAD to CAT flight and hotel package?
Opting for an IAD to CAT flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Choose from our impressive range of accommodations 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 Washington Dulles Intl. Airport (IAD) to Cascais Airport (CAT)?
Typically, you can modify or cancel your IAD to CAT flight. However, there may be additional fees, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you want more details, visit our Customer Service portal.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Cascais
Distance
3572 mi

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Washington to Cascais Flights

The cheapest times to fly from Washington to Cascais

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

 

The best time to book a flight from Washington to Cascais

Sunday is one of the best days to book for cheap flights from Washington to Cascais: 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 Washington to Cascais

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 Washington to Cascais 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 Washington to Cascais 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 Washington to Cascais 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.

 

Washington to Cascais Flights

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