Seville's Andalusian charm rarely comes with a nonstop ticket from the Midwest, and that's precisely what makes routing decisions on this itinerary so consequential. There is no direct option for business class from St. Louis to Seville, so the real strategic work happens at the connection point. American Airlines routes STL travelers through hubs like Chicago or Philadelphia before crossing the Atlantic, often codesharing with British Airways or Iberia through their transatlantic joint business venture. My preferred play is connecting via London Heathrow on American's widebody metal (typically a 777 with fully lie-flat seats in staggered configuration) and then transferring to British Airways' Club Suite for the Heathrow-to-Seville sector—though on this shorter European hop, you'll more often find yourself on Iberia's A320 business class, a perfectly comfortable regional product with blocked middle seats and Iberian hospitality rather than a true suite.
The alternative routing through Madrid via Iberia deserves serious consideration, especially since Iberia's long-haul business class on the A330 or A350 offers a genuinely restful transatlantic experience with direct aisle access on the A350, followed by a short domestic hop to Seville that Iberia operates frequently. Madrid also gives you the option to break your journey with a night in the capital—something seasoned travelers on this route quietly build into their itineraries to avoid the fatigue of a same-day double connection. If you do connect through Heathrow, budget extra time; Terminal 5's tight connection windows between long-haul arrivals and short-haul European departures have tripped up more than one relaxed traveler.
April, May, September, and October reward patience here, as Andalusian weather turns brutal by July and airlines adjust premium cabin award and revenue space accordingly during shoulder season. Given how fragmented and route-dependent pricing is across these carriers, setting up dedicated fare alerts for this specific STL-Seville combination will save you far more than casual searching ever could.
