Flights to London, Dublin, and Prague are featured in Delta's new sale. Book tickets by November 12.
Delta's New York sale includes flights between JFK and Chicago, Baltimore, and Denver. Travel is available through mid-February.
American's deal competes against AirTran's latest offer. Destinations include Atlanta, Chicago, Las Vegas, and Miami.
Hong Kong, Singapore, and Ho Chi Minh City are included in United's new Asia sale. Travel is valid through early December.
Virgin Atlantic's winter London sale fares are valid for travel in January and February. Departures are available from Washington, Chicago, Los Angeles, and Las Vegas.
