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Lisbon

$330+ Cheap flights from Dulles Intl (IAD) to Lisbon (LIS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LIS
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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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 Monday or Tuesday and return on a Sunday

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 August 18, 2025.

Round-trip from

$630
(Gotogate)

One-way from

$330
(Booking.com)

Popular in

June

Cheapest in

February

Average price

$947

Good round-trip deal

$514 or less

Good one-way deal

$296 or less
From Washington, D.C. Dulles Intl to Lisbon Humberto Delgado
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One-way flight from Washington, D.C. Dulles Intl to Lisbon Humberto Delgado
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Highest demand for flights based on searches. 17% potential increase in price ($187 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Lisbon Humberto Delgado.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Lisbon Humberto Delgado.
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Find flight deals from Dulles Intl to Lisbon

Cheapest flights from Dulles Intl to Lisbon
Explore the most affordable flight options available from Dulles Intl to Lisbon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This oojo deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2110:20 pmIAD - LIS
Nonstop7h 20mTAP AIR PORTUGAL
Fri 11/75:10 pmLIS - IAD
Nonstop8h 50mTAP AIR PORTUGAL
Deal found 8/18$630
This Mytrip deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/310:20 pmIAD - LIS
2 stops16h 40mMultiple Airlines
Mon 10/1310:45 pmLIS - IAD
2 stops22h 05mMultiple Airlines
Deal found 8/18$632
This FlightHub deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/109:05 pmIAD - LIS
1 stop15h 35mRoyal Air Maroc
Sun 10/196:40 pmLIS - IAD
1 stop29h 25mRoyal Air Maroc
Deal found 8/18$633
This FlightHub deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/141:30 pmIAD - LIS
1 stop29h 05mTurkish Airlines
Sun 10/1910:55 amLIS - IAD
1 stop29h 50mTurkish Airlines
Deal found 8/18$634
This FlightHub deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/305:00 pmIAD - LIS
Nonstop7h 20mTAP AIR PORTUGAL
Wed 10/155:30 pmLIS - IAD
Nonstop8h 20mTAP AIR PORTUGAL
Deal found 8/18$635
This Royal Air Maroc deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Royal Air Maroc is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/179:05 pmIAD - LIS
1 stop15h 35mRoyal Air Maroc
Thu 10/305:55 pmLIS - IAD
1 stop29h 50mRoyal Air Maroc
Deal found 8/17$636
This Royal Air Maroc deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Royal Air Maroc is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/319:45 pmIAD - LIS
1 stop15h 10mRoyal Air Maroc
Tue 12/25:55 pmLIS - IAD
1 stop29h 50mRoyal Air Maroc
Deal found 8/15$637
This FlightHub deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/149:40 pmIAD - LIS
1 stop36h 35mTurkish Airlines
Tue 9/2310:55 amLIS - IAD
1 stop37h 50mTurkish Airlines
Deal found 8/16$638
This Scandinavian Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/268:30 pmIAD - LIS
2 stops20h 40mScandinavian Airlines
Mon 12/18:05 amLIS - IAD
2 stops62h 10mScandinavian Airlines
Deal found 8/16$639
This Ovago deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/51:30 pmIAD - LIS
1 stop21h 00mTurkish Airlines
Wed 10/154:30 pmLIS - IAD
1 stop24h 15mTurkish Airlines
Deal found 8/17$640
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/291:30 pmIAD - LIS
1 stop20h 45mTurkish Airlines
Tue 10/144:45 pmLIS - IAD
1 stop24h 00mTurkish Airlines
Deal found 8/18$641
This Mytrip deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/215:20 pmIAD - LIS
2 stops22h 15mMultiple Airlines
Tue 11/410:50 amLIS - IAD
1 stop13h 40mMultiple Airlines
Deal found 8/18$642

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Lisbon that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 18, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Lisbon that are best for you.

Fly from

Dulles Intl

Fly to

Lisbon

Route

Depart

Return

Price

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Fri 11/7

8:45 pm-11:35 am

1 stop9h 50m

Lisbon Humberto Delgado

Wed 11/12

11:35 am-6:45 pm

1 stop12h 10m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Sun 11/2

8:45 pm-11:35 am

1 stop9h 50m

Lisbon Humberto Delgado

Sat 11/15

5:55 pm-6:45 pm

1 stop29h 50m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Sun 1/18

8:45 pm-4:55 pm

1 stop15h 10m

Lisbon Humberto Delgado

Wed 1/21

11:35 am-6:45 pm

1 stop12h 10m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Sun 1/18

8:45 pm-4:55 pm

1 stop15h 10m

Lisbon Humberto Delgado

Sat 1/24

5:55 pm-6:45 pm

1 stop29h 50m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Sat 1/17

8:45 pm-4:55 pm

1 stop15h 10m

Lisbon Humberto Delgado

Tue 1/20

5:55 pm-6:45 pm

1 stop29h 50m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Fri 10/17

9:05 pm-5:40 pm

1 stop15h 35m

Lisbon Humberto Delgado

Wed 10/29

11:35 am-7:45 pm

1 stop12h 10m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Fri 10/17

9:05 pm-5:40 pm

1 stop15h 35m

Lisbon Humberto Delgado

Sat 10/25

6:40 pm-7:45 pm

1 stop30h 05m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Sun 11/23

8:45 pm-4:55 pm

1 stop15h 10m

Lisbon Humberto Delgado

Tue 12/2

5:55 pm-6:45 pm

1 stop29h 50m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Fri 10/17

9:05 pm-5:40 pm

1 stop15h 35m

Lisbon Humberto Delgado

Thu 10/30

5:55 pm-7:45 pm

1 stop29h 50m

$636

Washington, D.C.Lisbon

IAD - LIS

IADLIS

Washington, D.C. Dulles Intl

Wed 10/29

9:45 pm-11:35 am

1 stop9h 50m

Lisbon Humberto Delgado

Sat 11/15

5:55 pm-6:45 pm

1 stop29h 50m

$636

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 20 results
1
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The best insider tips for Washington, D.C. Dulles Intl Airport to Lisbon flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to Lisbon trip
Airports
IAD

For evening departures, expect the check-in area to be crowded. Arrive early to navigate the bustling terminal efficiently.

Read more about IADby Ramsey Qubein
LIS

Upon arrival at LIS, use the metro line for a quick 20-minute trip to downtown Lisbon from Terminal 1.

Read more about LISby Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LIS and IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

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.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Lisbon. Price data was last updated on August 8, 2025.

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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Lisbon (average of $612). Flying from Washington, D.C. Dulles Intl Airport to Lisbon in June is currently the most expensive (average of $1,127). 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?

Find hourly flight availability from Dulles Intl to Lisbon. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 18, 2025.

It’s optimal to fly from Washington, D.C. Dulles Intl Airport to Lisbon at noon. By choosing this option you can save up to 22% on the cost of your flight, compared to a flight in the evening.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Lisbon

Explore weekly flight availability from Dulles Intl to Lisbon. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 18, 2025.

The most flights from IAD to LIS are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (5 on average).

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Lisbon?

Reviews of airlines servicing Lisbon

Get insights into the airlines that provide service to Lisbon. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Lisbon. Reviews last updated August 18, 2025.
See what other customers who have flown with United Airlines, Turkish Airlines, and TAP AIR PORTUGAL from Washington, D.C. Dulles Intl Airport to Lisbon have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,925 reviews
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Turkish Airlines
7.3
Good
3,945 reviews
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
TAP AIR PORTUGAL
7.1
Good
1,954 reviews
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,330 reviews
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Royal Air Maroc
6.1
Okay
500 reviews
United Airlines
7.4
Good
8,925 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

  • What airport do you fly into for flights to Lisbon from Washington, D.C. Dulles Intl?

    Most people fly into Lisbon Humberto Delgado (LIS) if they book a flight to Lisbon from Washington, D.C. Dulles Intl. On average, Humberto Delgado has 6 inbound flights from Washington, D.C. Dulles Intl per day from 13 airlines. Lisbon Humberto Delgado is conveniently located just 4.2 mi from Lisbon’s city center.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Lisbon?

    Departing from Washington, D.C. Dulles Intl Airport to Lisbon will take you 9h 50m. Airlines will cover a distance of 3580 mi.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Lisbon round-trip?

    Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to Lisbon round-trip from $333. Other airlines that can offer you cheap pricing are British Airways, from $480, and TAP AIR PORTUGAL, from $505. PLAY is currently priced 63% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Lisbon?

    The top 3 most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Lisbon are JetBlue (50%), TAP AIR PORTUGAL (48%) and Air Canada (48%).

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Lisbon?

    The cheapest flight price from Washington, D.C. Dulles Intl Airport to Lisbon is $218. On average you can expect to pay $1,550. The most popular route, (Washington, D.C. Dulles Intl - Lisbon Humberto Delgado), can usually be booked for $431.

  • Can I find deals for flights from Dulles Intl to Lisbon that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Lisbon flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Lisbon?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Lisbon.

  • Can I find deals for business class flights from Dulles Intl to Lisbon?

    Yes. Cheapflights offers flight deals from Dulles Intl to Lisbon by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Lisbon?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Lisbon (average of $612). Flying from Washington, D.C. Dulles Intl Airport to Lisbon in June is currently the most expensive (average of $1,127). 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.

See more FAQs

Traveling to a place near Lisbon?

Book flights to Lisbon if you plan to visit one of these locations
Sintra
Beja
Oeiras
Nazaré
Ericeira
Costa da Caparica
Torres Vedras
Sesimbra
Colares

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Top 10 airlines flying from Dulles Intl to Lisbon

Discover the top 10 airlines that operate flights from Dulles Intl to Lisbon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$336Average$384FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$480Average$694FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$506Average$898FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$508Average$646FlexibilityNo cancel feeOn-time71%
Royal Air MarocCheapest$552Average$639FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$554Average$631FlexibilityNo cancel feeOn-time77%
DeltaCheapest$563Average$816FlexibilityNo cancel feeOn-timeN/A
Turkish AirlinesCheapest$586Average$666FlexibilityNo cancel feeOn-time77%
IberiaCheapest$592Average$770FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$666Average$1,080FlexibilityNo cancel feeOn-timeN/A

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