Washington, D.C. Dulles Intl
Lisbon Humberto Delgado
1 stop
12h 55mLisbon Humberto Delgado
Washington, D.C. Dulles Intl
1 stop
14h 25mSWISS
Newark
Lisbon Humberto Delgado
1 stop
11h 50mLisbon Humberto Delgado
Newark
1 stop
21h 25mSWISS
Washington, D.C. Dulles Intl
Lisbon Humberto Delgado
1 stop
12h 55mLisbon Humberto Delgado
Washington, D.C. Dulles Intl
1 stop
14h 25mSWISS
Washington, D.C. Dulles Intl
Lisbon Humberto Delgado
1 stop
12h 55mLisbon Humberto Delgado
Washington, D.C. Dulles Intl
1 stop
25h 45mSWISS
Washington, D.C. Dulles Intl
Lisbon Humberto Delgado
1 stop
12h 55mLisbon Humberto Delgado
Washington, D.C. Dulles Intl
2 stops
18h 50mSWISS
Chicago O'Hare Intl
Lisbon Humberto Delgado
1 stop
13h 55mLisbon Humberto Delgado
Chicago O'Hare Intl
1 stop
26h 35mSWISS
January
$8,354
February
$6,733
March
$6,450
April
$6,890
May
$7,411
June
$7,428
July
$8,772
August
$7,179
September
$7,034
October
$4,688
November
$6,188
December
$6,340
Currently, the cheapest month for first class flights to Portugal is October. The most expensive month for first class flights is July. The cheapest prices are shown above but prices will vary according to departure times, airlines, and how early you book.