There's no nonstop path connecting San Diego to Valencia, which means every itinerary in business class from San Diego to Valencia requires at least one connection—and after flying this corridor repeatedly over the years, I've settled firmly on routing through London or Madrid rather than fighting through a third US hub. American Airlines offers a solid domestic-to-transatlantic handoff via its partnership with British Airways, typically connecting through Dallas, Chicago, or Philadelphia before crossing the Atlantic, while Iberia's own metal via Madrid gives you a more seamless Spanish entry point with fewer moving parts. The most rewarding hard product on this route is British Airways' Club Suite, found on their 777 and A350 aircraft, which finally brought BA into the modern era with direct-aisle access and a proper closing door—a meaningful upgrade if your transatlantic leg happens to fall on that equipment rather than an older Club World configuration.
My preference, developed after a few frustrating misconnections, is routing through Madrid on Iberia rather than London: Barajas Terminal 4S is genuinely one of Europe's most civilized hubs for business travelers, with a dedicated fast-track immigration lane for premium passengers and a short, uncrowded hop down to Valencia that rarely eats more than an hour. If you're transiting London instead, build in extra buffer time at Heathrow Terminal 5, especially during the summer crush—security and connections can eat 90 minutes even with priority lanes. One insider tip that's saved me repeatedly: Iberia's Madrid-Valencia domestic legs are often bookable as a separate, cheap positioning flight even when the transatlantic business fare doesn't include convenient timing, giving you flexibility to land in Madrid a day early and explore before continuing on.
April, May, September, and October remain the sweet spot for this itinerary, avoiding both the punishing Iberian summer heat and the premium pricing that peaks alongside it. Given how much fares fluctuate across these three carriers and their shifting fare buckets, setting up automated price tracking for this specific city pair is the smartest move you can make before booking.
