$109 Cheap Flights from Helena (HLN) to Seattle (SEA)

View $109 flight on Wed, Nov 12, 2025Opens in a new window

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

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Cheap Flights from Helena to Seattle (HLN-SEA)

Prices were available within the past 7 days and start at $109 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, Oct 28 - Sat, Nov 1
HLN
Helena
SEA
Seattle
$177 Roundtrip, found 3 hours ago
$177
Roundtrip
found 3 hours ago
Select Hawaiian Airlines flight, departing Tue, Oct 28 from Helena to Seattle, returning Sat, Nov 1, priced at $177 found 3 hours ago
Hawaiian Airlines
Sat, Nov 22 - Wed, Dec 3
HLN
Helena
SEA
Seattle
$187 Roundtrip, found 18 hours ago
$187
Roundtrip
found 18 hours ago
Select Hawaiian Airlines flight, departing Sat, Nov 22 from Helena to Seattle, returning Wed, Dec 3, priced at $187 found 18 hours ago
Delta
Sat, Sep 27 - Sat, Oct 4
HLN
Helena
SEA
Seattle
$197 Roundtrip, found 1 day ago
$197
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Sep 27 from Helena to Seattle, returning Sat, Oct 4, priced at $197 found 1 day ago
Hawaiian Airlines
Sun, Oct 26 - Sat, Nov 1
HLN
Helena
SEA
Seattle
$197 Roundtrip, found 3 hours ago
$197
Roundtrip
found 3 hours ago
Select Hawaiian Airlines flight, departing Sun, Oct 26 from Helena to Seattle, returning Sat, Nov 1, priced at $197 found 3 hours ago
Hawaiian Airlines
Mon, Oct 20 - Sat, Nov 22
HLN
Helena
SEA
Seattle
$207 Roundtrip, found 12 hours ago
$207
Roundtrip
found 12 hours ago
Select Hawaiian Airlines flight, departing Mon, Oct 20 from Helena to Seattle, returning Sat, Nov 22, priced at $207 found 12 hours ago
Delta
Sat, Sep 27 - Tue, Sep 30
HLN
Helena
SEA
Seattle
$217 Roundtrip, found 3 days ago
$217
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Sep 27 from Helena to Seattle, returning Tue, Sep 30, priced at $217 found 3 days ago
Hawaiian Airlines
Sun, Oct 26 - Sun, Nov 2
HLN
Helena
SEA
Seattle
$217 Roundtrip, found 3 hours ago
$217
Roundtrip
found 3 hours ago
Select Hawaiian Airlines flight, departing Sun, Oct 26 from Helena to Seattle, returning Sun, Nov 2, priced at $217 found 3 hours ago
Alaska Airlines
Tue, Oct 14 - Wed, Oct 15
HLN
Helena
SEA
Seattle
$227 Roundtrip, found 2 days ago
$227
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Oct 14 from Helena to Seattle, returning Wed, Oct 15, priced at $227 found 2 days ago
Delta
Sat, Oct 25 - Tue, Oct 28
HLN
Helena
SEA
Seattle
$229 Roundtrip, found 11 hours ago
$229
Roundtrip
found 11 hours ago
Select Delta flight, departing Sat, Oct 25 from Helena to Seattle, returning Tue, Oct 28, priced at $229 found 11 hours ago
United
Wed, Oct 15 - Sat, Oct 18
HLN
Helena
SEA
Seattle
$256 Roundtrip, found 12 hours ago
$256
Roundtrip
found 12 hours ago
Select United flight, departing Wed, Oct 15 from Helena to Seattle, returning Sat, Oct 18, priced at $256 found 12 hours ago

Find the cheapest month to fly from Helena (HLN) to Seattle (SEA)

January is typically the cheapest month to fly

From $137 - $387 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $633
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $633
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
$176
Distance
488 mi
Average flight time
1 hour 48 mins

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 October. 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 $109 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?
Grab a cheap one-way flight from $109 or cheap return flight from $177 from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
Traveling in October can help you save, as it's the cheapest month for flights between HLN and SEA. You'll usually find the lowest fares during off-peak months.
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 Helena Regional Airport (HLN) to Seattle - Tacoma Intl. Airport (SEA)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll take you from HLN to SEA. Then, sort your results by "Price (lowest to highest)" to score a great deal.
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.