Cheap flights from Philadelphia to Northwest Washington

View AU$213 flight on Wed, 29 Oct. 2025Opens in a new window

Popular airlines from Philadelphia to Northwest Washington

  • 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 Philadelphia (ILG) to Northwest Washington (SEA)

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.

Delta
Fri, 15 Aug. - Sat, 23 Aug.
PHL
Philadelphia
SEA
Seattle
AU$593 Return, found 6 days ago
AU$593
Return
found 6 days ago
Select Delta flight, departing Fri, 15 Aug. from Philadelphia to Seattle, returning Sat, 23 Aug., priced at AU$593 found 6 days ago
*Available to Expedia members.