$129 Cheap Flights from Helena (HLN) to San Francisco (SFO)

View $129 flight on Mon, Mar 9, 2026Opens in a new window

Popular airlines from Helena, MT (HLN-Helena Regional) to San Francisco Intl. Airport (SFO)

Cheap Flights from Helena to San Francisco (HLN-SFO)

Prices were available within the past 7 days and start at $129 for one-way flights and $262 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Sat, Jan 10 - Tue, Jan 27
HLN
Helena
SFO
San Francisco
$262 Roundtrip, found 5 hours ago
$262
Roundtrip
found 5 hours ago
Select Hawaiian Airlines flight, departing Sat, Jan 10 from Helena to San Francisco, returning Tue, Jan 27, priced at $262 found 5 hours ago
Alaska Airlines
Mon, Dec 8 - Fri, Dec 12
HLN
Helena
SFO
San Francisco
$263 Roundtrip, found 5 days ago
$263
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Mon, Dec 8 from Helena to San Francisco, returning Fri, Dec 12, priced at $263 found 5 days ago
Delta
Tue, Feb 24 - Wed, Mar 11
HLN
Helena
SFO
San Francisco
$264 Roundtrip, found 5 hours ago
$264
Roundtrip
found 5 hours ago
Select Delta flight, departing Tue, Feb 24 from Helena to San Francisco, returning Wed, Mar 11, priced at $264 found 5 hours ago
Delta
Sat, Dec 6 - Fri, Dec 12
HLN
Helena
SFO
San Francisco
$266 Roundtrip, found 5 days ago
$266
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Dec 6 from Helena to San Francisco, returning Fri, Dec 12, priced at $266 found 5 days ago
Hawaiian Airlines
Sat, Dec 6 - Mon, Dec 8
HLN
Helena
SFO
San Francisco
$267 Roundtrip, found 1 day ago
$267
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Sat, Dec 6 from Helena to San Francisco, returning Mon, Dec 8, priced at $267 found 1 day ago
Delta
Sat, Nov 22 - Wed, Dec 3
HLN
Helena
SFO
San Francisco
$274 Roundtrip, found 2 days ago
$274
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Nov 22 from Helena to San Francisco, returning Wed, Dec 3, priced at $274 found 2 days ago
Alaska Airlines
Sun, Dec 7 - Thu, Dec 11
HLN
Helena
SFO
San Francisco
$275 Roundtrip, found 5 days ago
$275
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sun, Dec 7 from Helena to San Francisco, returning Thu, Dec 11, priced at $275 found 5 days ago
Alaska Airlines
Mon, Dec 8 - Fri, Dec 12
HLN
Helena
SFO
San Francisco
$281 Roundtrip, found 5 days ago
$281
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Mon, Dec 8 from Helena to San Francisco, returning Fri, Dec 12, priced at $281 found 5 days ago
Hawaiian Airlines
Thu, Jan 8 - Tue, Jan 27
HLN
Helena
SFO
San Francisco
$282 Roundtrip, found 5 hours ago
$282
Roundtrip
found 5 hours ago
Select Hawaiian Airlines flight, departing Thu, Jan 8 from Helena to San Francisco, returning Tue, Jan 27, priced at $282 found 5 hours ago
United
Sun, Jan 18 - Thu, Jan 22
HLN
Helena
SFO
San Francisco
$511 Roundtrip, found 13 hours ago
$511
Roundtrip
found 13 hours ago
Select United flight, departing Sun, Jan 18 from Helena to San Francisco, returning Thu, Jan 22, priced at $511 found 13 hours ago

Find the cheapest month to fly from Helena (HLN) to San Francisco (SFO)

January is typically the cheapest month to fly

From $220 - $616 per traveler.

Alternative airports near San Francisco

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

Select flight to Oakland Intl. OAK. Cheapest option available. Average driving time to city center is 26 minutes. Flights from $475
OAK
Oakland Intl.
Cheapest
Average driving time to city center26 min
Flights from $475

Frequently asked questions

How much does a flight from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO) cost?
Get a cheap one-way flight from $129 or cheap return flight from $262 from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO)?
January is the most affordable month to fly from HLN to SFO. Traveling during quieter months is often the key to scoring lower fares.
What is the cheapest airline that flies from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest HLN to SFO flight.
How many flights per day from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO)?
There are no daily direct flights from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from HLN to SFO?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO)?
To arrive at San Francisco Intl. Airport (SFO) on schedule, choose a flight that takes off from Helena Regional Airport (HLN) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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.
Is it cheaper to buy a plane ticket from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO) last-minute?
Booking your plane ticket from HLN to SFO shortly before your trip is typically more expensive. But if you're flexible with your itinerary, you could snag a cheap last-minute fare.
Is it cheaper to book a HLN to SFO flight and hotel package?
Compared with arranging flights and hotels separately, booking a HLN to SFO flight and hotel package with Expedia could result in significant savings. Better still, having everything in one convenient place will take the hassle out of travel planning. Simply pick your flights and choose from our wide range of stays, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Helena Regional Airport (HLN) to San Francisco Intl. Airport (SFO)?
If you reserved your HLN to SFO flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Origin airport
Helena Regional
Destination airport
San Francisco Intl.
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$262
Distance
817 mi

Book with confidence

Helena to San Francisco Flights

The cheapest times to fly from Helena to San Francisco

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 San Francisco are during the month of January. You can find some of the cheapest flights from Helena to San Francisco with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Helena to San Francisco

Sunday is one of the best days to book for cheap flights from Helena to San Francisco: 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 San Francisco

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 San Francisco in 2025. You can also book with separate airlines for your outbound and return journeys, from $129 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 San Francisco 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 San Francisco 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 San Francisco Flights

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*Available to One Key members.