Hawaiian Airlines may offer seasonal nonstop or through partnerships and emphasizes island-focused service, while Delta, American, United, and Alaska provide frequent one-stop itineraries with varied connection hubs. Consider baggage allowances, seat assignment rules, and loyalty program benefits—some carriers include checked bags with certain fares, and others offer lower base fares with add-on fees. For September, compare total trip time and change/cancellation flexibility when choosing carriers; use primary keywords like "Hawaiian Airlines BOS HNL" and "Boston to Honolulu airline comparison" during searches. CTA: Compare flight options across carriers now to find the best value and schedule for your September trip.