Are there nonstop flights from St Louis (STL) to Barcelona (BCN)?

No. The fastest connection is via Toronto, about 9h 47m of total flying time.

What is the fastest connection from St Louis (STL) to Barcelona (BCN)?

via Toronto ≈ 9h 47m, via Montréal ≈ 9h 47m, via Chicago ≈ 9h 50m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

St. Louis Lambert International Airport (STL) to Josep Tarradellas Barcelona-El Prat Airport (BCN)・7,469 km

No nonstop flights. The fastest connection is via Toronto (YYZ), about 9h 47m of flying time (layover not included).

With milesANA 27,500 miles+ (via YYZ)JAL 37,000 miles+ (via ORD)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

17 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.