The major alliances have low summer fares for July and August travel with fares as low as $599 on Skyteam, $630 on Star Alliance and $635 Oneworld Alliance for San Francisco to Stockholm and Los Angeles to Copenhagen.
Los Angeles – Copenhagen
July 21-28
Delta Airlines $629.40
Los Angeles – Copenhagen
August 6-18
United Airlines $628.10
Los Angeles – Copenhagen
August 21-30
American Airlines $694.80
San Francisco – Stockholm
This route is dynamic this weekend. Routings and fares change bv the hour. I have seen American Airlines from San Francisco connecting to FinnAir via Chicago and Helsinki for $655. Fares with 23 hours in London. $599 in August on Delta. And loads of Star Alliance routings through Paris, London, Frankfurt, Amsterdam and more.
San Francisco to Stockholm
August 21-28
United Airlines $633.30
San Francisco to Stockholm
August 16-24
Delta Airlines $599.60
San Francisco to Stockholm
August 31-September 11
American Airlines $687.40
SFO-PHL-LHR-ARN-LHR-SFO 13,255 flight miles
(US Airways and British Airways operated flights)
American Airlines itineraries are most difficult to find, but there are some. I found fares as low as $636 round trip through Google Flights.
There are still good flight deals to Europe.
As a reminder, low cost carriers like Norwegian, RyanAir, EasyJet and others can get you all over Europe for less than $200 round trip. London is particularly inexpensive. RyanAir has flights as low as $33 round trip from Copenhagen to London Luton LTN.