Continuing the trend of $500 fares between the US and Nordic countries, Lufthansa is currently offering fares between Newark and Stockholm for $492 during parts of November.
Availability is fairly decent however departures need to take place on Monday with return flights needing to take place on Monday, Tuesday or Wednesday. It looks as though a minimum stay of 7 days is required as well. I haven’t had a chance to do a thorough testing of this fare, but the 3 or 4 sample bookings I tried on Google.com/flights basically shared the traits I mentioned above.
Please be mindful that these fares typically book into deep discount economy fare ‘buckets’ so in most cases these fares will earn little or no mileage for your frequent flyer program. However a fare this attractive sometimes trumps that detail!