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Cheap flights from Helena to Seattle from $129

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to Seattle departing on 11/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Helena to Seattle

Cheap round-trip flights

Alaska Airlines Logo
6:18 pm - 7:10 pmHLN-SEA
1h 52mnonstop
Alaska Airlines Logo
3:00 pm - 5:36 pmSEA-HLN
1h 36mnonstop
$157Alaska Airlines
Find Deal
Sat, Oct 25 - Tue, Oct 28
Delta Logo
12:50 pm - 5:00 pmHLN-SEA
5h 10m1 stop
Delta Logo
4:55 pm - 10:38 pmSEA-HLN
4h 43m1 stop
$177Delta
Find Deal
Sat, Feb 28 - Tue, Mar 3
Hawaiian Airlines Logo
6:28 pm - 7:20 pmHLN-SEA
1h 52mnonstop
Hawaiian Airlines Logo
3:13 pm - 5:51 pmSEA-HLN
1h 38mnonstop
$187Hawaiian Airlines
Find Deal
Sat, Dec 6 - Mon, Dec 8
Delta Logo
12:50 pm - 5:00 pmHLN-SEA
5h 10m1 stop
Delta Logo
4:55 pm - 10:38 pmSEA-HLN
4h 43m1 stop
$197Delta
Find Deal
Sat, Feb 28 - Tue, Mar 3
Hawaiian Airlines Logo
4:10 pm - 4:59 pmHLN-SEA
1h 49mnonstop
Hawaiian Airlines Logo
1:05 pm - 3:43 pmSEA-HLN
1h 38mnonstop
$208Hawaiian Airlines
Find Deal
Sat, Feb 28 - Tue, Mar 3
Delta Logo
1:00 pm - 6:24 pmHLN-SEA
6h 24m1 stop
Delta Logo
5:25 am - 12:20 pmSEA-HLN
5h 55m1 stop
$227Delta
Find Deal
Sat, Oct 25 - Tue, Oct 28
Delta Logo
1:00 pm - 4:32 pmHLN-SEA
4h 32m1 stop
Delta Logo
5:25 am - 12:20 pmSEA-HLN
5h 55m1 stop
$247Delta
Find Deal
Tue, Oct 7 - Thu, Oct 9
Alaska Airlines Logo
6:28 pm - 7:20 pmHLN-SEA
1h 52mnonstop
Alaska Airlines Logo
3:13 pm - 5:51 pmSEA-HLN
1h 38mnonstop
$268Alaska Airlines
Find Deal
Fri, Dec 12 - Sun, Dec 14
United Airlines Logo
5:18 pm - 11:29 pmHLN-SEA
7h 11m1 stop
United Airlines Logo
5:00 am - 2:09 pmSEA-HLN
8h 09m1 stop
$347United Airlines
Find Deal
Fri, Oct 3 - Sun, Oct 5
United Airlines Logo
2:42 pm - 9:24 pmHLN-SEA
7h 42m1 stop
United Airlines Logo
5:20 pm - 9:22 pmSEA-HLN
27h 02m2 stops
$406United Airlines
Find Deal
Sat, Oct 25 - Tue, Oct 28

Alaska Airlines flights from Helena to Seattle

Our best Alaska Airlines deals on Helena to Seattle flight tickets
Alaska Airlines
Oct 25
HLN6:18 pmHelena
1h 52m
SEA7:10 pmSeattle/Tacoma Intl
Oct 28
SEA3:00 pmSeattle/Tacoma Intl
1h 36m
HLN5:36 pmHelena
$157
Find similar
Alaska Airlines
Dec 12
HLN6:28 pmHelena
1h 52m
SEA7:20 pmSeattle/Tacoma Intl
Dec 14
SEA3:13 pmSeattle/Tacoma Intl
1h 38m
HLN5:51 pmHelena
$268
Find similar
Alaska Airlines
Oct 7
HLN6:18 pmHelena
1h 52m
SEA7:10 pmSeattle/Tacoma Intl
Oct 9
SEA3:07 pmSeattle/Tacoma Intl
1h 34m
HLN5:41 pmHelena
$278
Find similar

Delta flights from Helena to Seattle

Our best Delta deals on Helena to Seattle flight tickets
Delta
Feb 28
HLN12:50 pmHelena
5h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
Mar 3
SEA4:55 pmSeattle/Tacoma Intl
4h 43m
1 stop
HLN10:38 pmHelena
$177
Find similar
Delta
Feb 28
HLN12:50 pmHelena
5h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
Mar 3
SEA4:55 pmSeattle/Tacoma Intl
4h 43m
1 stop
HLN10:38 pmHelena
$197
Find similar
Delta
Oct 25
HLN1:00 pmHelena
6h 24m
1 stop
SEA6:24 pmSeattle/Tacoma Intl
Oct 28
SEA5:25 amSeattle/Tacoma Intl
5h 55m
1 stop
HLN12:20 pmHelena
$227
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Helena to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 10/25

6:18 pm-7:10 pm

Nonstop1h 52m

Seattle/Tacoma Intl

Tue 10/28

3:00 pm-5:36 pm

Nonstop1h 36m

$157

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 2/28

12:50 pm-5:00 pm

1 stop5h 10m

Seattle/Tacoma Intl

Tue 3/3

4:55 pm-10:38 pm

1 stop4h 43m

$177

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 12/6

6:28 pm-7:20 pm

Nonstop1h 52m

Seattle/Tacoma Intl

Mon 12/8

3:13 pm-5:51 pm

Nonstop1h 38m

$187

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 2/28

12:50 pm-5:00 pm

1 stop5h 10m

Seattle/Tacoma Intl

Tue 3/3

4:55 pm-10:38 pm

1 stop4h 43m

$197

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 2/28

4:10 pm-4:59 pm

Nonstop1h 49m

Seattle/Tacoma Intl

Tue 3/3

1:05 pm-3:43 pm

Nonstop1h 38m

$208

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 10/25

1:00 pm-6:24 pm

1 stop6h 24m

Seattle/Tacoma Intl

Tue 10/28

5:25 am-12:20 pm

1 stop5h 55m

$227

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Tue 10/7

1:00 pm-4:32 pm

1 stop4h 32m

Seattle/Tacoma Intl

Thu 10/9

5:25 am-12:20 pm

1 stop5h 55m

$247

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Fri 12/12

6:28 pm-7:20 pm

Nonstop1h 52m

Seattle/Tacoma Intl

Sun 12/14

3:13 pm-5:51 pm

Nonstop1h 38m

$268

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Fri 10/3

5:18 pm-11:29 pm

1 stop7h 11m

Seattle/Tacoma Intl

Sun 10/5

5:00 am-2:09 pm

1 stop8h 09m

$347

HelenaSeattle

HLN - SEA

HLNSEA

Helena

Sat 10/25

2:42 pm-9:24 pm

1 stop7h 42m

Seattle/Tacoma Intl

Tue 10/28

5:20 pm-9:22 pm

2 stops27h 02m

$406

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Helena to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, January is the cheapest month to fly from Helena to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $197. If you don’t want to visit Seattle in January, then you should wait until February to fly from Helena, when ticket prices are also cheap, with an average price of $227.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Helena is on a Thursday. momondo users have found tickets for Thursday departures for as low as $402. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday is the most expensive day to depart from Helena because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $507.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Helena at noon is the least expensive time of day to depart. momondo users have found prices as low as $402 when looking at flights departing at noon. Flights to Seattle are more costly in the morning, with an average ticket price of $495. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Helena to Seattle/Tacoma Intl flight route?

Fly from Helena to Seattle/Tacoma Intl for the best Helena - Seattle/Tacoma Intl flight prices

What cabin class options are available on Helena to Seattle/Tacoma Intl flights?

There are 3 cabin classes available to choose from on Helena to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Helena to Seattle flight prices changed over time?

When to book flights from Helena to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Helena to Seattle (HLN to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Helena to Seattle

Best Price Found

$206

Fastest flight time

1h 48m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun

Airports in Seattle

1 airport
The best one-way flight to Seattle from Helena in the past 72 hours is $206. The best round-trip flight deal from Helena to Seattle found on momondo in the last 72 hours is $227.
The fastest flight from Helena to Seattle takes 1h 48m
Direct flights go from Helena to Seattle on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

  • How far is Helena to Seattle/Tacoma Intl by plane?

    A flight from Helena to Seattle/Tacoma Intl will travel around 489.0 mi. Flights usually cover this in 1h 48m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Helena Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Helena Airport to Seattle/Tacoma Intl Airport are updated daily.

  • How many operators does momondo search for flights from Helena Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Helena Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Helena Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Helena to Seattle?

  • What is the most popular airline from Helena to Seattle?

Best airlines flying from Helena to Seattle

Compare and see reviews for airlines that fly from Helena to Seattle with momondo
Airline
Rating
Free Cancellation
Price
Hawaiian AirlinesPriceFrom $149Free CancellationRating
7.8
2,723 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $178Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
DeltaPriceFrom $196Free CancellationRating
7.9
7,954 reviews
Search Delta flights

  • Alaska Airlines Flights From Helena to Seattle

    Alaska Airlines flies from Helena to Seattle around 7 times per week, with 10,000 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Helena to Seattle in the last 72 hours was $178 (round-trip), much lower than the average airfare cost of $287 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Helena to Seattle

    Another popular option for Helena to Seattle flights is Hawaiian Airlines (7.8/10, 2,723 ratings). Hawaiian Airlines flies from Helena to Seattle around 7 times per week, with deals starting from $149 round-trip and rising to an average price of around $268.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Kirkland
Tukwila
Shoreline
Lakewood
Centralia
Fife
Cle Elum
Redmond
Westport

Why use momondo?

Why should I use momondo to find a flight deal from Helena to Seattle?

It is quick and easy to find Helena to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

Can I find flights from Helena to Seattle with flexible booking policies on momondo?

All flight searches from Helena to Seattle on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Helena to Seattle?

momondo helps you find the best flight between Helena and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Helena to Seattle right now. Can momondo alert me if prices change?

Price alerts on flights to Seattle from Helena are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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