$99 Cheap Flights from Helena (HLN) to Seattle (SEA)

View $99 flight on Tue, Jan 13, 2026Opens in a new window

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

Cheap Flights from Helena to Seattle (HLN-SEA)

Prices were available within the past 7 days and start at $99 for one-way flights and $137 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Dec 6 - Tue, Dec 9
HLN
Helena
SEA
Seattle
$137 Roundtrip, found 5 days ago
$137
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Dec 6 from Helena to Seattle, returning Tue, Dec 9, priced at $137 found 5 days ago
Delta
Tue, Nov 18 - Thu, Nov 27
HLN
Helena
SEA
Seattle
$147 Roundtrip, found 4 days ago
$147
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Nov 18 from Helena to Seattle, returning Thu, Nov 27, priced at $147 found 4 days ago
Delta
Wed, Nov 19 - Thu, Nov 27
HLN
Helena
SEA
Seattle
$157 Roundtrip, found 4 days ago
$157
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Nov 19 from Helena to Seattle, returning Thu, Nov 27, priced at $157 found 4 days ago
Alaska Airlines
Sat, Jan 10 - Tue, Jan 13
HLN
Helena
SEA
Seattle
$157 Roundtrip, found 2 hours ago
$157
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sat, Jan 10 from Helena to Seattle, returning Tue, Jan 13, priced at $157 found 2 hours ago
Delta
Sat, Nov 22 - Wed, Dec 3
HLN
Helena
SEA
Seattle
$167 Roundtrip, found 1 day ago
$167
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Nov 22 from Helena to Seattle, returning Wed, Dec 3, priced at $167 found 1 day ago
Alaska Airlines
Sat, Jan 17 - Tue, Jan 20
HLN
Helena
SEA
Seattle
$168 Roundtrip, found 6 days ago
$168
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Sat, Jan 17 from Helena to Seattle, returning Tue, Jan 20, priced at $168 found 6 days ago
Alaska Airlines
Sat, Dec 6 - Tue, Dec 9
HLN
Helena
SEA
Seattle
$170 Roundtrip, found 5 days ago
$170
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Dec 6 from Helena to Seattle, returning Tue, Dec 9, priced at $170 found 5 days ago
Hawaiian Airlines
Thu, Dec 18 - Sat, Jan 3
HLN
Helena
SEA
Seattle
$177 Roundtrip, found 3 hours ago
$177
Roundtrip
found 3 hours ago
Select Hawaiian Airlines flight, departing Thu, Dec 18 from Helena to Seattle, returning Sat, Jan 3, priced at $177 found 3 hours ago
Alaska Airlines
Mon, Jan 26 - Wed, Jan 28
HLN
Helena
SEA
Seattle
$178 Roundtrip, found 5 days ago
$178
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Mon, Jan 26 from Helena to Seattle, returning Wed, Jan 28, priced at $178 found 5 days ago
United
Fri, Jan 9 - Sat, Jan 10
HLN
Helena
SEA
Seattle
$277 Roundtrip, found 2 hours ago
$277
Roundtrip
found 2 hours ago
Select United flight, departing Fri, Jan 9 from Helena to Seattle, returning Sat, Jan 10, priced at $277 found 2 hours ago

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

January is typically the cheapest month to fly

From $136 - $387 per traveler.

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 $262
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $262

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 $99 or cheap return flight from $137 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 December 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.

Travel information

Origin airport
Helena Regional
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$136
Distance
488 mi
Average flight time
1 hour 49 mins

Book with confidence

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 December. 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 $99 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.

 

Helena to Seattle Flights

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*Available to One Key members.