Flights to Scandinavian airports of Copenhagen, Oslo and Stockholm have been lower in 2015 than years past due to competition from Norwegian, Icelandair and Wow Air flying these routes at low cost fares.
Star Alliance has United Airlines with SAS, Swiss Air and Lufthansa for Scandinavia access.
Oneworld has American Airlines with British Airways access to the Nordic countries and Iberia covering the south.
Skyteam has Delta Airlines with KLM, Air France and Alitalia covering European routes, not to mention Aeroflot.
Norwegian Airlines has offered fares under $400 roundtrip between Stockholm, Sweden and Oakland, California this year.
Loyalty Traveler – Norwegian OAK-ARN $373 round trip Feb 2015 (Dec. 11, 2014)
Those fares were impressive, but Stockholm in February is not the brightest place in winter. These are some pretty amazing economy class fares available from all three alliances flying Stockholm to San Francisco roundtrip in April and May.
Stockholm, Sweden ARN – SFO San Francisco, California
British Airways $485 round trip
$485.06 = 4,171 SEK roundtrip British Airways April 14-20.
Stockholm, Sweden ARN – SFO San Francisco, California
KLM Air France $500 round trip
Stockholm, Sweden ARN – SFO San Francisco, California
Swiss Airlines $544 round trip
Swiss Airlines ARN – SFO roundtrip SEK 4673 = $544 USD on March 30, 2015. Find currency exchange rates at xe.com.
Low cost flights under $500 roundtrip are available for departures Tuesday or Wednesday into the second week of May.
Stockholm, Sweden ARN – Los Angeles LAX $480, more availability than SFO
Stockholm ARN – LAX Los Angeles route has even more availability as low as $480 roundtrip into June 2015.
Link to American Airlines Sweden site through Google Flights.
American Airlines June 2 ARN-LAX; June 23 LAX-ARN
4,126 SEK = $479.94
Fly American Airlines LHR-LAX and LAX-LHR and British Airways between Stockholm and London for $480 roundtrip (xe.com)