$99 Cheap Delta flights Helena (HLN) to Seattle (SEA)

Landing cheap one-way Delta Air Lines flights from HLN to SEA from $99 on Expedia is simple — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $197 for your next exciting vacation.**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.

Delta Air Lines flights to Seattle are usually cheaper in the low-season months of January and February. Whether you’re searching for a one-way or a return ticket, you could land a better deal then.

Start searching one to three months ahead of your departure date to find cheap fares on Delta Air Lines flights from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get the timing right, and you can enjoy significant savings on domestic journeys.*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.

To figure out if there’s a direct trip from HLN to SEA with Delta Air Lines or any other airlines, check the “Nonstop” box when browsing for tickets.

To find the earliest departures from HLN to SEA with Delta Air Lines, filter your search by “Early Morning” and “Morning.” Booking an early flight generally 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.

Delta Air Lines flights from Helena Regional Airport (HLN) to Seattle land at Seattle - Tacoma Intl. Airport (SEA). This is the main gateway to this city.

Delta Air Lines makes traveling from HLN to SEA more comfortable with a rewarding loyalty program and an excellent in-flight experience. You could even start collecting points with Delta SkyMiles. Be sure to sign up to our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are often free within 24 hours of making your booking, but your airline may charge a fee after that. For more information about modifying your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the freedom to update your itinerary without additional charges, tick the “No cancel fee” or “Changes included” filter when organizing your trip.