The best round-trip flight deal from Philadelphia to Copenhagen found on momondo in the last 72 hours is $909. Prices are subject to change.

The best one-way flight to Copenhagen from Philadelphia in the past 72 hours is $834. Prices are subject to availability and can change.

The best round-trip flight deal from Boston to Copenhagen found on momondo in the last 72 hours is $699.

Best round-trip flight deal from Washington, D.C. to Copenhagen found on momondo in the last 72 hours. Prices reflect round-trip travel based on flight data.

The best one-way flight to Copenhagen from Seattle in the past 72 hours is $590. This price is based on historical flight data and subject to availability.