Extended: Europe First Class Upgrades from Business Class on United Starting at $400 One-Way, Non-Stop

Sample Savings: New York – London now goes for $4,063 round-trip (inclusive). The regular fare is $5,344 (inclusive), a savings of $1,281 (24%).

Business Class on this route goes for $3,263, so for $400 more each way you can upgrade to United’s First Class.