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 at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Sunday 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, TAP AIR PORTUGAL have had the lowest number of delays on this route, with just 17% of flights being delayed.

How often are flights from Washington, D.C. to Lisbon delayed?

About 21% of weekly flights between Washington, D.C. and Lisbon have experienced delays in the past year, with the average delay time being 153 minutes.

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 19h 55m. Washington, D.C. Dulles Intl Airport and Lisbon are separated by a distance of 3580 mi. This flight may include one or multiple stops.

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

The most flights from IAD to LIS are scheduled on a Monday (5 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

In terms of precipitation, rainfall in Lisbon ranges from 6.0 - 122.0 inches per month. December is typically the wettest month, when rainfall can reach 122.0 mm. July is typically the driest time to visit Lisbon when rainfall is around 6.0 mm.

If weather is an important factor for your trip to Lisbon, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

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

No one likes to see their flight delayed. When booking a flight from Washington, D.C. Dulles Intl Airport to Lisbon consider choosing airBaltic (100%), JetBlue (95%) or TAP AIR PORTUGAL (95%) as they are the most reliable in getting you off to your destination on time.

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

For a flight from Washington, D.C. Dulles Intl to Lisbon, you will be flying into Humberto Delgado. Lisbon Humberto Delgado (LIS) is just 4.2 mi from the center of the city. Humberto Delgado is the only Lisbon airport and it handles 4 inbound flights from Washington, D.C. Dulles Intl per day. 0 airlines have flights to Lisbon Humberto Delgado from Washington, D.C. Dulles Intl on a regular basis.

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 holiday 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.

£365+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Lisbon

Cheap flight deals from Dulles Intl to Lisbon

Enter your travel dates to find the best prices.

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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 5 November 2026.

Sat 5/1219:40 -

1 stop12h 10m

Thu 10/1214:00 -

1 stop33h 30m

Deal found 31/10£530

Mon 30/1117:25 -

Nonstop7h 10m

Wed 9/1216:40 -

Nonstop8h 50m

Deal found 5/11£563

Mon 30/1113:30 -

1 stop20h 35m

Wed 9/1211:35 -

1 stop36h 50m

Deal found 3/11£580

Mon 7/1209:05 -

1 stop20h 35m

Fri 18/1205:00 -

1 stop15h 55m

Deal found 2/11£583

Sun 13/1217:46 -

1 stop9h 24m

Tue 22/1205:00 -

1 stop15h 55m

Deal found 2/11£583

Mon 7/1218:40 -

1 stop17h 50m

Mon 14/1211:30 -

1 stop33h 15m

Deal found 2/11£584

Sun 13/1212:35 -

1 stop14h 25m

Fri 25/1205:00 -

1 stop15h 55m

Deal found 2/11£585

Mon 7/1217:46 -

1 stop9h 24m

Tue 15/1212:50 -

2 stops37h 23m

Deal found 2/11£586

Sat 5/1222:10 -

1 stop30h 10m

Thu 17/1205:00 -

1 stop15h 55m

Deal found 2/11£586

Sun 6/1212:38 -

2 stops17h 47m

Wed 16/1205:00 -

1 stop15h 55m

Deal found 3/11£588

Sun 6/1212:35 -

2 stops15h 20m

Mon 14/1211:30 -

1 stop33h 15m

Deal found 1/11£589

Sun 13/1222:15 -

Nonstop6h 50m

Wed 23/1212:20 -

Nonstop8h 20m

Deal found 3/11£590

Find flight deals from Dulles Intl to Lisbon

Round-trip from	£530
One-way from	£365
Popular in	June
Cheapest in	January
Average price	£660

Icelandair
5/12-10/12
2 total stops
45h 40m total
Washington, D.C. to Lisbon

Search Deals

Icelandair
7/12-31/12
1 total stop
12h 05m total
Washington, D.C. to Lisbon

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£150 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£22 potential savings vs. average return price).

Search Deals

Average for round-trip flights in November 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Lisbon that are best for you.

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Cheapest return flight

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Sun 27/12

17:45-10:30

1 stop11h 45m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£439

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Tue 10/11

12:35-15:15

2 stops21h 40m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£462

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Fri 25/12

16:30-15:10

2 stops17h 40m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£477

Fastest return journey

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Tue 29/12

22:30-10:20

Nonstop6h 50m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£523

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Sun 28/3

23:20-20:40

2 stops16h 20m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£523

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Fri 8/1

22:30-10:40

Nonstop7h 10m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£527

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Thu 4/3

21:20-23:25

1 stop21h 05m

Lisbon Humberto Delgado

Fri 12/3

11:35-11:45

1 stop29h 10m

£580

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Tue 5/1

12:49-08:00

2 stops14h 11m

Lisbon Humberto Delgado

Thu 14/1

05:00-15:55

1 stop15h 55m

£592

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Sat 12/12

17:25-05:35

Nonstop7h 10m

Lisbon Humberto Delgado

Wed 31/12

00:00-18:00

Nonstop0h 00m

£594

Washington, D.C.Lisbon

IAD Washington, D.C. Dulles Intl - LIS Lisbon Humberto Delgado

IADLIS

Washington, D.C. Dulles Intl

Thu 22/4

13:15-15:45

1 stop21h 30m

Lisbon Humberto Delgado

Mon 26/4

16:45-19:50

1 stop32h 05m

£610

Flights are sorted by cheapest return flights first.

Deals found on 2/11

Showing 1-10 of 24 resultsSorted by cheapest first

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.

IAD-LIS

Estimated return 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

Prices

Airlines

Delays

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 70 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 £494). Flying from Washington, D.C. Dulles Intl Airport to Lisbon in June is currently the most expensive (average of £1,060). 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 much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to Lisbon?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to Lisbon flights typically cost between £565 and £914 in December.
The cheapest return price found within the last 5 days was £530 on Icelandair (5 Dec–10 Dec).

Related info for your journey

What airport do you fly into for flights to Lisbon from Washington, D.C. Dulles Intl?
For a flight from Washington, D.C. Dulles Intl to Lisbon, you will be flying into Humberto Delgado. Lisbon Humberto Delgado (LIS) is just 4.2 mi from the center of the city. Humberto Delgado is the only Lisbon airport and it handles 4 inbound flights from Washington, D.C. Dulles Intl per day. 0 airlines have flights to Lisbon Humberto Delgado from Washington, D.C. Dulles Intl on a regular basis.
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 19h 55m. Washington, D.C. Dulles Intl Airport and Lisbon are separated by a distance of 3580 mi. This flight may include one or multiple stops.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Lisbon?
No one likes to see their flight delayed. When booking a flight from Washington, D.C. Dulles Intl Airport to Lisbon consider choosing airBaltic (100%), JetBlue (95%) or TAP AIR PORTUGAL (95%) as they are the most reliable in getting you off to your destination on time.
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 holiday 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 £494). Flying from Washington, D.C. Dulles Intl Airport to Lisbon in June is currently the most expensive (average of £1,060). 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.

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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.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Lisbon?

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.

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Cheap flights from Washington, D.C. Dulles Intl Airport to Lisbon from £365

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Dulles Intl to Lisbon

Cheapest flights from Dulles Intl to LisbonExplore 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 5 November 2026.

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 5 November 2026.

Best flights from Dulles Intl to LisbonDiscover carefully curated flight deals from Dulles Intl to Lisbon that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 November 2026.

Discover carefully curated flight deals from Dulles Intl to Lisbon that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 November 2026.

Direct flights from Dulles Intl to LisbonExplore direct flight options from Dulles Intl to Lisbon based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 November 2026.

Explore direct flight options from Dulles Intl to Lisbon based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 November 2026.

Last-minute flights from Dulles Intl to LisbonDiscover last-minute flight deals from Dulles Intl to Lisbon. Data last updated 5 November 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Lisbon. Data last updated 5 November 2026 and is based on user searches.

One-way flights from Dulles Intl to LisbonSearch for one-way flight options from Dulles Intl to Lisbon. Find affordable one-way fares based on user searches. Data last updated 5 November 2026.

Search for one-way flight options from Dulles Intl to Lisbon. Find affordable one-way fares based on user searches. Data last updated 5 November 2026.

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Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Lisbon that are best for you.

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

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 70 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?

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 much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to Lisbon?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to Lisbon flights typically cost between £565 and £914 in December.The cheapest return price found within the last 5 days was £530 on Icelandair (5 Dec–10 Dec).

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

The most flights from IAD to LIS are scheduled on a Monday (5 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

How often are flights from Washington, D.C. to Lisbon delayed?

About 21% of weekly flights between Washington, D.C. and Lisbon have experienced delays in the past year, with the average delay time being 153 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 at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Sunday 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, TAP AIR PORTUGAL have had the lowest number of delays on this route, with just 17% of flights being delayed.

Related info for your journey

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

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

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

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

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

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

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

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Can Cheapflights notify me if prices for flights from Dulles Intl to Lisbon become cheaper?

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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 5 November 2026.

Best flights from Dulles Intl to Lisbon
Discover carefully curated flight deals from Dulles Intl to Lisbon that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 November 2026.

Direct flights from Dulles Intl to Lisbon
Explore direct flight options from Dulles Intl to Lisbon based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 November 2026.

Last-minute flights from Dulles Intl to Lisbon
Discover last-minute flight deals from Dulles Intl to Lisbon. Data last updated 5 November 2026 and is based on user searches.

One-way flights from Dulles Intl to Lisbon
Search for one-way flight options from Dulles Intl to Lisbon. Find affordable one-way fares based on user searches. Data last updated 5 November 2026.

Washington, D.C. Dulles Intl Airport to Lisbon flights typically cost between £565 and £914 in December.
The cheapest return price found within the last 5 days was £530 on Icelandair (5 Dec–10 Dec).