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£133 Cheap Flights from Helena (HLN) to San Francisco (SFO)

View £133 flight on Tue, 15 Sept 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at £133 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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

March is typically the cheapest month to fly

From £176 - £356 per traveller.

Frequently asked questions

How much does a flight from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) cost?
You can find one-way and return flights from HLN to SFO with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when HLN to SFO ticket fares go up or down.
What is the cheapest month to fly from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
The cheapest months to fly from HLN to SFO are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
Enter HLN to SFO and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
Delta is one of the cheapest airlines offering connecting return flights from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.), with prices starting from around £164 for flights that can be booked for departure within the next year, with a layover in Salt Lake City Intl. (SLC). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
To find a cheap flight from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
There are approximately 4 connecting flights per day from Helena Regional (HLN) to San Francisco Intl. (SFO). Some common connection points include Seattle - Tacoma Intl. (SEA), Denver Intl. (DEN), and Salt Lake City Intl. (SLC).
What is the earliest flight from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
The earliest flight from Helena Regional (HLN) to San Francisco Intl. (SFO) typically departs around 5:30 AM local time. This service is operated by Delta and is seasonal, active in January, February, March, and April. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
You'll generally find the most flights from Helena Regional (HLN) to San Francisco Intl. (SFO) on a Tuesday, with around 5 flights available. This gives you a good selection of options for your journey. Major airlines on this route include United, Delta, and Alaska Airlines. Flight schedules are quite consistent throughout the week, so you'll have similar choices on other days too.
What are the most popular departure times for flights from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
The most popular departure times for flights from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) are in the early morning, from 6am to 9am. Many travelers prefer this because it allows for an early arrival in San Francisco, giving you more time to enjoy your day. United offers flights during this window.
How long does it take to fly from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
There are no nonstop flights from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.). The distance between these two cities is approximately 1,315 kilometres (817 miles). For flights with one stop, you can expect the journey to typically take around 6 hours 18 minutes. If your flight has two or more stops, the travel time will be longer, usually around 10 hours 18 minutes. Keep in mind that actual flight times can vary based on factors like layover duration, routing, and weather conditions.
Can you fly business or first class from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
You can fly business or first class between HLN and SFO. First class cabins are available on Alaska Airlines, Delta, and United.
How do I earn miles on a Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) flight with Expedia?
It's easy to earn miles on a Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for San Francisco, CA (SFO) from Helena, MT (HLN)?
If you're planning to travel to San Francisco from Helena Regional (HLN), you can fly directly into San Francisco Intl. (SFO). Some flights may connect through major hubs like Denver Intl. (DEN), Seattle - Tacoma Intl. (SEA), or Salt Lake City Intl. (SLC) before reaching San Francisco. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) at the last minute?
Typically, booking a last minute flight from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) flight and hotel package?
Securing a Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.)?
If you booked your Helena, MT (HLN-Helena Regional) to San Francisco, CA (SFO-San Francisco Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket 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'd like more information.

Travel information

Origin airport
Helena Regional
Destination airport
San Francisco Intl.
Distance
1307 km

Book with confidence

Compare flights from Helena to San Francisco easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Helena to San Francisco. Operating between them flights per day, 3 airlines cover the route. And fly direct, getting you to San Francisco Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Helena Regional to San Francisco Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Helena Regional (HLN) to San Francisco Intl. (SFO)

The easiest way to view the best deals on flights from Helena to San Francisco today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Helena Regional to San Francisco Intl. start at just and range up to .  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Helena and San Francisco
  • booking your flight during , the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Helena to San Francisco flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Helena Regional to San Francisco Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Helena to San Francisco easily and book with confidence

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*Available to Expedia members.