$122 Cheap Flights from San Diego (SAN) to Helena (HLN)

View $122 flight on Sat, May 31, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from San Diego to Helena (SAN-HLN)

Prices were available within the past 7 days and start at $122 for one-way flights and $244 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Tue, May 6 - Tue, May 20
SAN
San Diego
HLN
Helena
$244 Roundtrip, found 2 days ago
$244
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Tue, May 6 from San Diego to Helena, returning Tue, May 20, priced at $244 found 2 days ago
Alaska Airlines
Sat, May 17 - Sat, May 24
SAN
San Diego
HLN
Helena
$244 Roundtrip, found 8 hours ago
$244
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Sat, May 17 from San Diego to Helena, returning Sat, May 24, priced at $244 found 8 hours ago
Hawaiian Airlines
Tue, May 6 - Sun, May 25
SAN
San Diego
HLN
Helena
$254 Roundtrip, found 2 days ago
$254
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Tue, May 6 from San Diego to Helena, returning Sun, May 25, priced at $254 found 2 days ago
Alaska Airlines
Sat, Jun 7 - Mon, Jun 9
SAN
San Diego
HLN
Helena
$258 Roundtrip, found 2 days ago
$258
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Jun 7 from San Diego to Helena, returning Mon, Jun 9, priced at $258 found 2 days ago
Hawaiian Airlines
Wed, Apr 30 - Sat, May 17
SAN
San Diego
HLN
Helena
$263 Roundtrip, found 2 days ago
$263
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Apr 30 from San Diego to Helena, returning Sat, May 17, priced at $263 found 2 days ago
Hawaiian Airlines
Fri, May 16 - Thu, Jun 5
SAN
San Diego
HLN
Helena
$264 Roundtrip, found 2 days ago
$264
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Fri, May 16 from San Diego to Helena, returning Thu, Jun 5, priced at $264 found 2 days ago
Alaska Airlines
Wed, Jun 4 - Wed, Jun 11
SAN
San Diego
HLN
Helena
$269 Roundtrip, found 6 days ago
$269
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Jun 4 from San Diego to Helena, returning Wed, Jun 11, priced at $269 found 6 days ago
Hawaiian Airlines
Wed, Apr 30 - Mon, May 19
SAN
San Diego
HLN
Helena
$273 Roundtrip, found 2 days ago
$273
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Apr 30 from San Diego to Helena, returning Mon, May 19, priced at $273 found 2 days ago
Delta
Wed, Jun 11 - Sat, Jun 14
SAN
San Diego
HLN
Helena
$279 Roundtrip, found 5 days ago
$279
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Jun 11 from San Diego to Helena, returning Sat, Jun 14, priced at $279 found 5 days ago
United
Sat, May 3 - Sat, May 10
SAN
San Diego
HLN
Helena
$315 Roundtrip, found 2 days ago
$315
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 3 from San Diego to Helena, returning Sat, May 10, priced at $315 found 2 days ago
Flights from San Diego (SAN) to Helena (HLN)
Origin airport
San Diego Intl.
Destination airport
Helena Regional
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$244
Distance
997 mi

San Diego to Helena Flights

The cheapest times to fly from San Diego to Helena

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

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

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

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 San Diego to Helena in 2025. You can also book with separate airlines for your outbound and return journeys, from $122 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 San Diego to Helena 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 San Diego to Helena 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.

Frequently asked questions

How much does a flight from San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN) cost?
Discover the latest flight deals from SAN to HLN by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from SAN to HLN?
The cheapest flights from SAN to HLN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SAN to HLN?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from SAN to HLN. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN)?
You’ll have to hop on a flight with a layover if you’re traveling from San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN). Direct flights don’t operate daily on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from SAN to HLN?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can vary depending on various factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN)?
To avoid potential delays on the San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN) route, fly before 3 PM. Flights after this time have a 22% higher chance of being canceled.**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 San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN) last-minute?
Holding off until just before your departure to book a flight from SAN to HLN often results in higher prices. While you may come across some last-minute discounts, they aren’t always guaranteed. Be flexible with your travel plans for the best chance of landing a bargain.
Is it cheaper to book a SAN to HLN flight and hotel package?
You’ll typically save money by booking a SAN to HLN flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it’s easy to manage it all in one convenient place. After selecting your ideal accommodations and flights, consider adding extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from San Diego Intl. Airport (SAN) to Helena Regional Airport (HLN)?
If you reserved your SAN to HLN flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

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*Available to One Key members.