Milwaukee's General Mitchell Field will never host a nonstop to Spain, which is precisely why the routing strategy matters more than the marketing copy. Business class from Milwaukee to Valencia realistically funnels through two corridors: American Airlines via Chicago O'Hare or Philadelphia connecting onto British Airways or Iberia metal into Madrid, then a short domestic hop to Valencia, or a transatlantic leg to London Heathrow or Madrid-Barajas with a same-alliance connection. The factual baseline worth remembering: total journey time typically runs 12-15 hours door-to-door once you account for connections, even though the transatlantic segment itself is roughly 8.5 hours. I've routed this trip through both hubs repeatedly, and Madrid consistently wins for reliability—Iberia's A330 and A350 business class cabins offer flat-bed seats with direct aisle access on the A350, and the connection to Valencia via Iberia's regional network is seamless within Terminal 4, one of Europe's more efficient hub layouts.
The London routing has its own appeal if you can snag availability in British Airways' Club Suite, which finally brought sliding doors and proper privacy to BA's long-haul fleet—look specifically for A350 or 777-9 rotations out of Chicago or Philadelphia rather than older 777 configurations still running Club World's dated staggered layout. Heathrow's Terminal 5 is BA's dedicated home, making the connection to Valencia (often via a short BA CityFlyer or partner hop) far less stressful than terminal-hopping elsewhere. My insider tip: award seats on the Chicago-Madrid Iberia nonstop open up disproportionately often in the six-week window before departure during shoulder season, since Iberia rebalances premium inventory as Spanish leisure demand softens—worth checking even after you've written off award space as gone.
April, May, September, and October remain the sweet spot, avoiding both summer's heat and premium pricing while still delivering Valencia's best weather for wandering the City of Arts and Sciences jet-lag-free. Given how much these fares swing week to week across three carriers and two viable hub strategies, setting up automated fare tracking on this specific city pair will save you far more than manual searching ever could.
