$89 Cheap Flights from Helena (HLN) to Seattle (SEA)

View $89 flight on Wed, May 28, 2025Opens in a new window

Popular airlines from Helena, MT (HLN-Helena Regional) to Seattle-Tacoma International Airport (SEA)

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Find available prices by choosing your travel dates.

Cheap Flights from Helena to Seattle (HLN-SEA)

Prices were available within the past 7 days and start at $89 for one-way flights and $177 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Tue, Jun 3 - Wed, Jun 4
HLN
Helena
SEA
Seattle
$177 Roundtrip, found 10 hours ago
$177
Roundtrip
found 10 hours ago
Select Hawaiian Airlines flight, departing Tue, Jun 3 from Helena to Seattle, returning Wed, Jun 4, priced at $177 found 10 hours ago
Alaska Airlines
Wed, May 14 - Tue, May 27
HLN
Helena
SEA
Seattle
$187 Roundtrip, found 15 hours ago
$187
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Wed, May 14 from Helena to Seattle, returning Tue, May 27, priced at $187 found 15 hours ago
Delta
Tue, Jun 10 - Wed, Jun 11
HLN
Helena
SEA
Seattle
$197 Roundtrip, found 4 hours ago
$197
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Jun 10 from Helena to Seattle, returning Wed, Jun 11, priced at $197 found 4 hours ago
Alaska Airlines
Mon, May 19 - Wed, May 21
HLN
Helena
SEA
Seattle
$197 Roundtrip, found 7 hours ago
$197
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Mon, May 19 from Helena to Seattle, returning Wed, May 21, priced at $197 found 7 hours ago
Hawaiian Airlines
Thu, Jun 5 - Tue, Jun 10
HLN
Helena
SEA
Seattle
$207 Roundtrip, found 4 hours ago
$207
Roundtrip
found 4 hours ago
Select Hawaiian Airlines flight, departing Thu, Jun 5 from Helena to Seattle, returning Tue, Jun 10, priced at $207 found 4 hours ago
Delta
Sun, Jun 1 - Wed, Jun 4
HLN
Helena
SEA
Seattle
$210 Roundtrip, found 7 hours ago
$210
Roundtrip
found 7 hours ago
Select Delta flight, departing Sun, Jun 1 from Helena to Seattle, returning Wed, Jun 4, priced at $210 found 7 hours ago
Delta
Tue, Jun 10 - Mon, Jun 16
HLN
Helena
SEA
Seattle
$217 Roundtrip, found 4 hours ago
$217
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Jun 10 from Helena to Seattle, returning Mon, Jun 16, priced at $217 found 4 hours ago
Hawaiian Airlines
Thu, Jun 5 - Sun, Jun 8
HLN
Helena
SEA
Seattle
$217 Roundtrip, found 4 hours ago
$217
Roundtrip
found 4 hours ago
Select Hawaiian Airlines flight, departing Thu, Jun 5 from Helena to Seattle, returning Sun, Jun 8, priced at $217 found 4 hours ago
Alaska Airlines
Wed, May 28 - Thu, Jul 10
HLN
Helena
SEA
Seattle
$220 Roundtrip, found 9 hours ago
$220
Roundtrip
found 9 hours ago
Select Alaska Airlines flight, departing Wed, May 28 from Helena to Seattle, returning Thu, Jul 10, priced at $220 found 9 hours ago
United
Mon, Jun 9 - Wed, Jun 11
HLN
Helena
SEA
Seattle
$251 Roundtrip, found 20 hours ago
$251
Roundtrip
found 20 hours ago
Select United flight, departing Mon, Jun 9 from Helena to Seattle, returning Wed, Jun 11, priced at $251 found 20 hours ago
Flights from Helena (HLN) to Seattle (SEA)
Origin airport
Helena Regional
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$177
Distance
488 mi

Helena to Seattle Flights

The cheapest times to fly from Helena to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Helena to Seattle are during the month of June. You can find some of the cheapest flights from Helena to Seattle with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Helena to Seattle

Sunday is one of the best days to book for cheap flights from Helena to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Helena to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Helena to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $89 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Helena to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Helena to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) cost?
You’ll find cheap return fares from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) starting at $177. Grab a seat and set off on your next adventure. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Alaska Airlines flight leaving HLN on May 18 2025 and touching down at SEA. The price was last updated on April 23 2025 and has not changed since.
What is the cheapest month to fly from HLN to SEA?
The cheapest flights from HLN to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
You can travel nonstop from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) on an Alaska Airlines flight.
What is the cheapest airline that flies from HLN to SEA?
Fly from HLN to SEA with Alaska Airlines. This airline currently has the cheapest one-way fare on this route, starting at $89. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from HLN on June 11 2025. Prices were last updated on April 23 2025 and have not changed since.
How many flights per day from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
On average, just 1 nonstop flight departs daily from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA). Need other options? Use Expedia’s filters to find flights with layovers and add an extra destination to your journey.
What are the most popular departure times for flights from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
More people fly between HLN and SEA at 4 PM than at any other point in the day. Looking to skip the crowds? Pick a flight outside the busiest times and you’re likely to save on your ticket as well.
What day of the week has the most flights from HLN to SEA?
Travel on a Friday if you’re searching for the largest selection of flights from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
The earliest flight departing from Helena Regional Airport (HLN) is at around 4:41PM UTC-7. Board this plane and you’ll arrive at Seattle - Tacoma Intl. Airport (SEA) at approximately 5:32PM UTC-8. The entire trip takes 1h 51m.
How long does it take to fly from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
It usually takes 1 hour and 51 minutes to travel the 490 mi from HLN to SEA.
What airline has the least delays from HLN to SEA?
Consider booking with Alaska Airlines if you’d like to go straight from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) without any delays. This airline has the best track record for punctuality, with an on-time performance of 86%. Want to be notified if anything changes? You can keep an eye on your flight status using the Expedia App.
What is the best time to fly from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
To avoid potential delays on the Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) route, fly before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Seattle from Helena Regional Airport (HLN)?
Browse your flight options from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA). This is the only Seattle airport you can touch down at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Last-minute bookings from HLN to SEA are usually more expensive. For the best prices, start searching for flights as soon as possible. That said, if you’re flexible with your travel dates, you may land a cheap fare right before you leave.
Is it cheaper to book a HLN to SEA flight and hotel package?
Compared with arranging flights and hotels separately, booking a HLN to SEA flight and hotel package with Expedia could lead to significant savings. Better yet, managing everything in one place will take the stress out of planning your trip. Just pick your flights and choose from our wide range of hotels, then customize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
In most instances, you’re able to cancel or reschedule your HLN to SEA flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline’s guidelines and fees on flight changes, or if you need further information, visit our Customer Service portal.

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*Available to One Key members.