$615 will get you from Los Angeles to Stockholm via London and back via Frankfurt. You will get some hours to explore London and Frankfurt as well.
It is 12,897 miles flown.
K Class will only earn you miles on United operated flights with United Mileage Plus.
** Only available after card approval. Minimum spend of $3,000 in the first 90 days required. Points redemption only available for purchase made with eligible travel merchants.