Salzburg's postage-stamp airport, tucked against the mountains, has no direct long-haul service from the United States, which means anyone booking business class from Portland to Salzburg is really booking a two-leg journey with a European gateway in between. After years of routing through Amsterdam, Frankfurt, and Munich, my preferred sequence starts with Delta out of PDX, connecting via Amsterdam or Paris onto a KLM or Air France partner metal, then a short intra-European hop into Salzburg; United passengers will typically transit through Newark or Chicago before crossing the Atlantic via Star Alliance partners like Lufthansa, with Austrian Airlines (OS) frequently handling the final Vienna–Salzburg or Munich–Salzburg segment. The long transatlantic leg is where the real business class product lives, and Delta One's suite with sliding door offers genuine privacy for the roughly 10-hour crossing, while United's Polaris seats on 767 or 777 aircraft deliver lie-flat comfort with direct aisle access on most configurations.
The connection strategy matters more than the transatlantic cabin choice here. I've found that routing through Munich rather than Frankfurt shaves real stress off the final leg, since Lufthansa and Austrian's Munich-Salzburg turboprop or regional jet connections are shorter and less prone to the gate-change chaos that plagues Frankfurt's sprawling terminals. If Austrian Airlines operates your final segment from Vienna, budget extra connection time in Vienna's compact but occasionally congested terminal, especially during the ski season crush from December through February when Salzburg becomes a gateway for Alpine resorts. One tip rarely mentioned: flying into Munich and taking a private transfer or train the final two hours into Salzburg often proves faster and less turbulent than waiting on a weather-dependent regional connector, particularly in winter when Salzburg's mountain-adjacent runway sees more delays than you'd expect.
Award and revenue fares on this routing swing dramatically by season, and January through March, plus October and November, consistently offer the softest pricing as both leisure and ski traffic dip before and after peak windows. Given the multi-carrier, multi-leg nature of this itinerary, setting up dedicated fare alerts for the Portland-Salzburg corridor is the smartest way to catch mispriced business class fares before they disappear.
