Philadelphia offers a low fare to Copenhagen with Delta at the $622 low end and British Airways or American Airlines at the $690 high end travel in July and August.
Delta has this fare with no advance purchase for flights as soon as tomorrow May 1. The real savings here are July and August dates when most airport departures from the USA to Europe are over $1,000 for economy class.
SkyTeam Alliance
Delta Airlines Philadelphia PHL – CPH Copenhagen
$615.90 May 27 – June 3
Star Alliance
Lufthansa Airlines Philadelphia PHL – CPH Copenhagen
$650.74 Tuesday July 7 – Tuesday July 14 Economy K class
Lufthansa economy K class earns 25% flight miles in Miles & More for the PHL-FRA segments and only a flat rate 125 miles for the Frankfurt – Copenhagen segments. Warning: Lufthansa K class does not earn miles with United Mileage Plus when purchased through Lufthansa website.
Oneworld Alliance
British Airways Philadelphia PHL – CPH Copenhagen
$689.60 Wednesday July 8 – Wednesday July 15 Economy O class and S class.
American Airlines AAdvantage members earn 100% flight miles and elite qualifying miles and 50% elite qualifying points for British Airways flights and codeshares.
Great Circle Map shows flight distance as 8,310 miles round trip.
