$17,916 MXN Cheap United flights Boston (BOS) to Seoul (ICN)

Scoring cheap one-way United Airlines flights from BOS to ICN from $17,916 MXN on Expedia is a cinch — just filter by "Price (lowest to highest)." Or check out our affordable round-trip fares from $30,580 MXN for your next break.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To grab cheap flights from BOS to ICN with United Airlines, begin your search about one month before your planned departure. You can save 17% when you book your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Want another tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Filter your results by "Early Morning" and "Morning" to find the earliest departures from BOS to ICN. Heading off early means you're less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.

A rewarding loyalty program and the opportunity to collect points through United Mileage Plus are the start of the reasons to jet off from BOS to ICN with United Airlines. Plus, when you join our One Key™ program, you can receive OneKeyCash™* on top of any airline loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.