Cheap flights from Washington, D.C. Dulles Intl Airport to Lisbon
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Lisbon Humberto Delgado are usually found in February or January, booked 88 days in advance, depart on a Friday or Monday and return on a Monday
Cheap flight deals from Dulles Intl to Lisbon
Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Lisbon (LIS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 17 October 2025.
Popular in | June |
|---|---|
Cheapest in | February |
Average price | £593 |
Good round-trip deal | £374 or less |
Good one-way deal | £171 or less |
Best time to book a flight from Dulles Intl to Lisbon
Have a flexible travel schedule? Discover the best time to fly to Lisbon from Dulles Intl with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Lisbon
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Lisbon?
The price you pay for your flight from Washington, D.C. Dulles Intl Airport to Lisbon may vary depending on when you book. For the best chance of a lower fare, look to book 88 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Lisbon?
Currently, July is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Lisbon (average of £257). Flying from Washington, D.C. Dulles Intl Airport to Lisbon in December is currently the most expensive (average of £409). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from IAD to LIS?
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to Lisbon as you normally would.
How often are flights from Washington, D.C. to Lisbon delayed?
About 29% of weekly flights between Washington, D.C. and Lisbon have experienced delays in the past year, with the average delay time being 144 minutes.
What is the most punctual flight time for Washington, D.C. to Lisbon flights?
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Tuesday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Washington, D.C. to Lisbon flights?
Over the past year, JetBlue have had the lowest number of delays on this route, with just 28% of flights being delayed.
Related info for your journey
Find useful and relevant information for your journey from Dulles Intl to Lisbon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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How does Cheapflights help users find flights from Dulles Intl to Lisbon?
When you search for this flight from Dulles Intl to Lisbon, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
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By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Lisbon from Dulles Intl.
Can Cheapflights find flights from Dulles Intl to Lisbon with no change fees?
Yes! Cheapflights helps users easily find flights from Dulles Intl to Lisbon with no change fees.
Can Cheapflights notify me if prices for flights from Dulles Intl to Lisbon become cheaper?
Yes, Cheapflights offers price alerts on Dulles Intl to Lisbon flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.