SWISS and United often provide the most direct options between Boston Logan International Airport (BOS) and Zurich Airport (ZRH), with SWISS offering a Swiss-centric onboard experience and United providing strong codeshare options. Lufthansa and other European carriers typically route through Frankfurt, Munich, or London and can offer competitive fares and frequent connections. Evaluate business vs economy class amenities, frequent flyer benefits, and baggage inclusions when comparing. In January, also factor in schedule changes and on-time performance during winter conditions. CTA: Compare seat maps, baggage rules, and fares across airlines to choose the optimal BOS→ZRH carrier for your January trip.