United has dropped fares to Europe from several US cities. Flights to Amsterdam, Paris, Rome, Madrid, and a few other cities are mostly in the mid-$400s round-trip from a variety of cities across the USA. Fares dip as low as $367 round-trip.
This is unadvertised and may not last very long. Book quickly if something catches your eye. Most third party booking sites have a 24-hour free cancellation policy so you'll have a day to figure out the details.
Travel is available mostly in May and June. A few routes have availability from October through mid-December as well. A 28-day advance purchase and a 7-night minimum stay is required. Some flights may be operated by Star Alliance partner airlines. Click on the links below for full details on each route.
A sample of fares include:
Miami to Madrid $367 round-trip
Fort Lauderdale to Madrid $374 round-trip
Phoenix to Madrid $384 round-trip
Charlotte to Barcelona $397 round-trip
Dallas to Madrid $404 round-trip
Atlanta to Amsterdam $457 round-trip
Detroit to Amsterdam $457 round-trip
Orlando to Amsterdam $457 round-trip
Pittsburgh to Amsterdam $457 round-trip
Raleigh to Amsterdam $457 round-trip
Minnneapolis to Amsterdam $457 round-trip
Newark to Lyon $459 round-trip
Hartford to Lyon $459 round-trip
Fort Lauderdale to Lyon $459 round-trip
Charlotte to Milan $462 round-trip
Minneapolis to Milan $463 round-trip
Pittsburgh to Milan $463 round-trip
Richmond to Milan $463 round-trip
Hartford to Rome $470 round-trip
Orlando to Nice $484 round-trip
Raleigh to Paris $495 round-trip
Detroit to Paris $495 round-trip
Atlanta to Rome $504 round-trip
Minneapolis to Nice $512 round-trip
These are the prices you'll find on the major booking sites. Some obscure third party sites may offer slightly lower fares. For more fares, check out our fare pages for all flights to to Amsterdam, Paris, Rome, Milan, Madrid, Barcelona, Lyon, and Nice. Other cities in these countries are likely lower than normal as well.