Amsterdam, Frankfurt, and Paris are featured in Northwest's new Europe offer. Book tickets by Wednesday, August 20.
Delta's deal competes with offers from AirTran and American and features Atlanta and New York. Book tickets by August 26.
Southwest's latest offer features flights from September 5 through 30. Las Vegas, Los Angeles, New Orleans, and Orlando are included.
Flights to Myrtle Beach, Orlando, and San Juan are included in Spirit's new offer. Book tickets by Monday, August 18.
