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 | $450 (Mytrip) |
One-way from | $227 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $785 |
Good round-trip deal | $471 or less |
Good one-way deal | $289 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Tue 12/2
9:15 pm-10:00 am
1 stop31h 45m
Lisbon Humberto Delgado
Tue 12/9
11:30 am-11:45 am
1 stop29h 15m
Washington, D.C.Lisbon
DCA - LIS
DCALIS
Washington, D.C. Reagan-National
Tue 1/13
6:00 am-9:20 am
1 stop22h 20m
Lisbon Humberto Delgado
Tue 2/3
11:20 am-12:24 pm
2 stops30h 04m
Washington, D.C.Lisbon
DCA - LIS
DCALIS
Washington, D.C. Reagan-National
Wed 12/3
5:02 pm-3:15 pm
2 stops17h 13m
Lisbon Humberto Delgado
Tue 12/9
7:40 am-10:57 pm
2 stops20h 17m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Wed 1/7
12:43 pm-9:20 am
2 stops15h 37m
Lisbon Humberto Delgado
Thu 1/15
5:00 am-8:15 pm
1 stop20h 15m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Wed 1/14
12:55 pm-9:20 am
2 stops15h 25m
Lisbon Humberto Delgado
Tue 3/24
5:00 am-9:15 pm
1 stop20h 15m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Tue 1/6
7:49 pm-3:10 pm
2 stops14h 21m
Lisbon Humberto Delgado
Tue 1/13
5:00 am-4:05 pm
1 stop16h 05m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Tue 1/13
12:23 pm-11:20 am
2 stops17h 57m
Lisbon Humberto Delgado
Tue 1/20
5:00 am-4:05 pm
1 stop16h 05m
Washington, D.C.Lisbon
IAD - LIS
IADLIS
Washington, D.C. Dulles Intl
Mon 1/5
9:00 am-8:00 am
2 stops18h 00m
Lisbon Humberto Delgado
Mon 1/12
11:25 am-4:05 pm
1 stop33h 40m
Washington, D.C.Lisbon
DCA - LIS
DCALIS
Washington, D.C. Reagan-National
Sun 1/18
5:00 pm-8:00 am
1 stop10h 00m
Lisbon Humberto Delgado
Wed 1/28
10:00 am-4:29 pm
1 stop11h 29m
Washington, D.C.Lisbon
DCA - LIS
DCALIS
Washington, D.C. Reagan-National
Wed 1/7
12:20 pm-8:00 am
2 stops14h 40m
Lisbon Humberto Delgado
Thu 1/15
5:30 am-4:29 pm
2 stops15h 59m
| 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 Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
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 $346). Flying from Washington, D.C. to Lisbon in December is currently the most expensive (average of $551). 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.
Boarding
Crew
Overall
Food
Comfort
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Boarding
Crew
Overall
Food
Comfort
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Boarding
Crew
Overall
Food
Comfort
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Boarding
Crew
Overall
Food
Comfort
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Boarding
Crew
Overall
Food
Comfort
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Boarding
Crew
Overall
Food
Comfort
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$345 | Average$396 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$504 | Average$599 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$508 | Average$749 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$509 | Average$947 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$510 | Average$782 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$552 | Average$673 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$563 | Average$980 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$586 | Average$670 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$592 | Average$770 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$707 | Average$1,148 | FlexibilityNo cancel fee | On-time62% |