Expect long security queues at IAD, especially in the afternoon and evening. Plan extra time for check-in and security clearance.

Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $517 (Mytrip) |
One-way from | $276 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $1,391 |
Good round-trip deal | $547 or less |
Good one-way deal | $323 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.Lisbon
DCA - LIS
DCALIS
Washington, D.C. Reagan-National
Mon 3/16
2:25 pm-9:30 pm
2 stops27h 05m
Lisbon Humberto Delgado
Fri 3/20
7:10 pm-10:36 pm
2 stops31h 26m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Mon 1/26
7:49 pm-4:05 pm
2 stops39h 16m
Lisbon Humberto Delgado
Fri 1/30
4:40 pm-7:09 pm
2 stops31h 29m
Washington, D.C.Lisbon
DCA - LIS
DCALIS
Washington, D.C. Reagan-National
Tue 3/3
12:05 pm-3:40 pm
2 stops22h 35m
Lisbon Humberto Delgado
Wed 3/11
7:00 pm-10:36 pm
2 stops31h 36m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Mon 5/11
8:20 pm-3:35 pm
1 stop14h 15m
Lisbon Humberto Delgado
Sat 5/16
7:15 am-4:50 pm
1 stop14h 35m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Mon 3/16
6:30 pm-5:35 am
Nonstop7h 05m
Lisbon Humberto Delgado
Tue 3/31
11:40 am-3:05 pm
Nonstop8h 25m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Thu 4/23
5:45 pm-6:10 am
Nonstop7h 25m
Lisbon Humberto Delgado
Tue 4/28
11:40 am-3:05 pm
Nonstop8h 25m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Fri 2/13
10:30 pm-10:35 am
Nonstop7h 05m
Lisbon Humberto Delgado
Wed 2/18
5:15 pm-9:00 pm
Nonstop8h 45m
BaltimoreLisbon
BWI - LIS
BWILIS
Baltimore/Washington
Thu 1/29
4:45 pm-3:40 pm
2 stops17h 55m
Lisbon Humberto Delgado
Thu 2/5
6:55 pm-10:02 pm
2 stops32h 07m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Mon 5/18
9:00 pm-5:40 pm
1 stop15h 40m
Lisbon Humberto Delgado
Mon 5/25
6:40 pm-7:00 pm
1 stop29h 20m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Wed 4/15
10:35 pm-10:55 am
Nonstop7h 20m
Lisbon Humberto Delgado
Sun 4/19
5:15 pm-8:35 pm
Nonstop8h 20m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*1 star |
Booking 82 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. to Lisbon. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, July is the cheapest month in which you can book a flight from Washington, D.C. to Lisbon (average of $345). Flying from Washington, D.C. to Lisbon in March is currently the most expensive (average of $550). 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.
Unlike in the evening, when flights are generally more expensive, you can save up to 5% on flights from Washington, D.C. to Lisbon by exploring options for tickets in the afternoon.
Travelers seeking maximum savings on their Washington, D.C. to Lisbon flight should consider departing on Sunday afternoons when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from WAS to LIS are scheduled on a Monday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).
About 28% of weekly flights between Washington, D.C. and Lisbon have experienced delays in the past year, with the average delay time being 140 minutes.
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.
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.
Over the last year, TAP AIR PORTUGAL have had the lowest number of delays on this route, with just 26% of flights being delayed.
Food
Boarding
Entertainment
Crew
Overall
Comfort
Reviews
Kevin,Dec 2025
BOS - EWR
Food
Boarding
Entertainment
Crew
Overall
Comfort
Reviews
Kevin,Dec 2025
BOS - EWR
Food
Boarding
Entertainment
Crew
Overall
Comfort
Reviews
Kevin,Dec 2025
BOS - EWR
Food
Boarding
Entertainment
Crew
Overall
Comfort
Reviews
Kevin,Dec 2025
BOS - EWR
Food
Boarding
Entertainment
Crew
Overall
Comfort
Reviews
Kevin,Dec 2025
BOS - EWR
Food
Boarding
Entertainment
Crew
Overall
Comfort
Reviews
Kevin,Dec 2025
BOS - EWR
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$345 | Average$399 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$504 | Average$599 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$506 | Average$953 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$508 | Average$1,022 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$510 | Average$774 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$551 | Average$669 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$563 | Average$980 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$585 | Average$668 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$592 | Average$770 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$666 | Average$1,116 | FlexibilityNo cancel fee | On-timeN/A |