Cheap flights from Washington to Tras-os-Montes

View AU$409 flight on Tue, 5 Aug. 2025Opens in a new window

Popular airlines from Washington to Tras-os-Montes

  • Jetstar

    Jetstar

  • Qantas Airways

    Qantas Airways

  • Virgin Australia

    Virgin Australia

  • Scoot

    Scoot

  • American Airlines

    American Airlines

  • Emirates

    Emirates

  • United

    United

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Washington (WAS) to Tras-os-Montes (OPO)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, 7 Sep. - Sun, 14 Sep.
DCA
Washington
OPO
Porto
AU$1,088 Return, found 3 days ago
AU$1,088
Return
found 3 days ago
Select United flight, departing Sun, 7 Sep. from Washington to Porto, returning Sun, 14 Sep., priced at AU$1,088 found 3 days ago
United
Sun, 7 Sep. - Sun, 14 Sep.
DCA
Washington
OPO
Porto
AU$1,125 Return, found 3 days ago
AU$1,125
Return
found 3 days ago
Select United flight, departing Sun, 7 Sep. from Washington to Porto, returning Sun, 14 Sep., priced at AU$1,125 found 3 days ago
KLM
Sun, 7 Sep. - Sun, 14 Sep.
DCA
Washington
OPO
Porto
AU$1,218 Return, found 3 days ago
AU$1,218
Return
found 3 days ago
Select KLM flight, departing Sun, 7 Sep. from Washington to Porto, returning Sun, 14 Sep., priced at AU$1,218 found 3 days ago
JetBlue Airways
Sun, 7 Sep. - Sun, 14 Sep.
DCA
Washington
OPO
Porto
AU$1,461 Return, found 3 days ago
AU$1,461
Return
found 3 days ago
Select JetBlue Airways flight, departing Sun, 7 Sep. from Washington to Porto, returning Sun, 14 Sep., priced at AU$1,461 found 3 days ago
Delta
Sun, 7 Sep. - Sun, 14 Sep.
DCA
Washington
OPO
Porto
AU$1,496 Return, found 3 days ago
AU$1,496
Return
found 3 days ago
Select Delta flight, departing Sun, 7 Sep. from Washington to Porto, returning Sun, 14 Sep., priced at AU$1,496 found 3 days ago
TAP Portugal
Sun, 7 Sep. - Sun, 14 Sep.
DCA
Washington
OPO
Porto
AU$1,515 Return, found 3 days ago
AU$1,515
Return
found 3 days ago
Select TAP Portugal flight, departing Sun, 7 Sep. from Washington to Porto, returning Sun, 14 Sep., priced at AU$1,515 found 3 days ago
*Available to Expedia members.