In terms of precipitation, rainfall in Helena ranges from 0.3 - 2.1 inches per month. June is typically the wettest month, when rainfall can reach 2.1 in. February is typically the driest time to visit Helena when rainfall is around 0.3 in.

If weather is an important factor for your trip to Helena, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 21.2 F).

What is the cheapest time of day to fly from STS to HLN?

When flying from Santa Rosa to Helena, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from Santa Rosa to Helena that include hotel bookings?

Yes. In addition to deals on Santa Rosa to Helena flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Santa Rosa to Helena?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Santa Rosa to Helena.

Can I find deals for business class flights from Santa Rosa to Helena?

Yes. Cheapflights offers flight deals from Santa Rosa to Helena by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$230+ Flights from Santa Rosa to Helena

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Cheap flight deals from Santa Rosa to Helena

Popular in	March
Cheapest in	October
Average price	$736

Highest demand for flights based on searches. 25% potential increase in price ($201 potential increase over avg. RT price).

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Cheapest flight prices on average. 9% potential price decrease ($50 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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One-way flights from Santa Rosa to Helena
Search for one-way flight options from Santa Rosa to Helena. Find affordable one-way fares based on user searches. Data last updated September 17, 2025.

Mon 11/102:22 pmSTS - HLN

1 stop26h 14mAlaska Airlines

Deal found 9/16

$230

Mon 11/1010:50 amSTS - HLN

3 stops29h 46mMultiple Airlines

Deal found 9/16

$465

Fly from

Fly to

Route

Depart

Return

Price

Santa RosaHelena

STS - HLN

STSHLN

Santa Rosa Sonoma County

Mon 11/10

2:22 pm-5:36 pm

1 stop26h 14m

$230

Santa RosaHelena

STS - HLN

STSHLN

Santa Rosa Sonoma County

Mon 11/10

10:50 am-5:36 pm

3 stops29h 46m

$465

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Best time to book a flight from Santa Rosa to Helena

Have a flexible travel schedule? Discover the best time to fly to Helena from Santa Rosa with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Santa Rosa to Helena

What is the cheapest month to book a flight from Santa Rosa to Helena?

Currently, February is the cheapest month in which you can book a flight from Santa Rosa to Helena (average of $353). Flying from Santa Rosa to Helena in May is currently the most expensive (average of $517). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Can I find deals for flights from Santa Rosa to Helena that include hotel bookings?
Yes. In addition to deals on Santa Rosa to Helena flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Santa Rosa to Helena?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Santa Rosa to Helena.
Can I find deals for business class flights from Santa Rosa to Helena?
Yes. Cheapflights offers flight deals from Santa Rosa to Helena by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Santa Rosa to Helena?
Currently, February is the cheapest month in which you can book a flight from Santa Rosa to Helena (average of $353). Flying from Santa Rosa to Helena in May is currently the most expensive (average of $517). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$230+ Cheap flights from Santa Rosa to Helena (STS - HLN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel.

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One-way flights from Santa Rosa to HelenaSearch for one-way flight options from Santa Rosa to Helena. Find affordable one-way fares based on user searches. Data last updated September 17, 2025.

Search for one-way flight options from Santa Rosa to Helena. Find affordable one-way fares based on user searches. Data last updated September 17, 2025.

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Best time to book a flight from Santa Rosa to Helena

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Cheapflights Insights

Everything you need to know about your flight from Santa Rosa to Helena

What is the cheapest month to book a flight from Santa Rosa to Helena?

Related info for your journey

Find useful and relevant information for your journey from Santa Rosa to Helena. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from Santa Rosa to Helena that include hotel bookings?

How can I find direct flights from Santa Rosa to Helena?

Can I find deals for business class flights from Santa Rosa to Helena?

What is the cheapest month to book a flight from Santa Rosa to Helena?

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One-way flights from Santa Rosa to Helena
Search for one-way flight options from Santa Rosa to Helena. Find affordable one-way fares based on user searches. Data last updated September 17, 2025.