$308 Cheap Flights from San Juan (SJU) to Helena (HLN)

View $308 flight on Wed, Mar 11, 2026Opens in a new window

Popular airlines from Luis Munoz Marin Intl. Airport (SJU) to Helena, MT (HLN-Helena Regional)

Cheap Flights from San Juan to Helena (SJU-HLN)

Prices were available within the past 7 days and start at $308 for one-way flights and $1,179 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,179 Roundtrip, found 11 hours ago
$1,179
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,179 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,211 Roundtrip, found 11 hours ago
$1,211
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,211 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,250 Roundtrip, found 11 hours ago
$1,250
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,250 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,260 Roundtrip, found 11 hours ago
$1,260
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,260 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,264 Roundtrip, found 11 hours ago
$1,264
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,264 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,273 Roundtrip, found 11 hours ago
$1,273
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,273 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,294 Roundtrip, found 11 hours ago
$1,294
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,294 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,327 Roundtrip, found 11 hours ago
$1,327
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,327 found 11 hours ago
United
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,359 Roundtrip, found 11 hours ago
$1,359
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,359 found 11 hours ago
Delta
Fri, Nov 28 - Tue, Dec 2
SJU
San Juan
HLN
Helena
$1,862 Roundtrip, found 11 hours ago
$1,862
Roundtrip
found 11 hours ago
Select Delta flight, departing Fri, Nov 28 from San Juan to Helena, returning Tue, Dec 2, priced at $1,862 found 11 hours ago

Frequently asked questions

How much does a flight from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN) cost?
Snag a cheap one-way flight from $308 or cheap return flight from $1,179 from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN)?
Flying in November may help you find better deals, as it's the cheapest month for flights between SJU and HLN. You'll typically find the lowest prices during the off-season.
What is the cheapest airline that flies from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SJU to HLN flight.
How many flights per day from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN)?
Nonstop flights from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SJU to HLN?
Typically you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can vary depending on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN)?
To avoid potential delays on the Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN) route, travel before 3 PM. Departures after this time have a 22% higher chance of cancellation.**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 Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN) last-minute?
Holding off until just before your departure to book your flight from SJU to HLN often results in higher prices. While you may come across some last-minute deals, there's no guarantee. Be flexible with your itinerary for the best chance of snagging a bargain.
Is it cheaper to book a SJU to HLN flight and hotel package?
Compared with arranging hotels and flights separately, booking a SJU to HLN flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place will take the hassle out of planning your trip. Just secure your flights and select from our wide range of stays, then personalize your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Luis Munoz Marin Intl. Airport (SJU) to Helena Regional Airport (HLN)?
It's generally possible to reschedule or cancel your SJU to HLN flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Luis Munoz Marin Intl.
Destination airport
Helena Regional
Airlines serving
Delta, United
Roundtrip price
$1,179
Distance
3243 mi

Book with confidence

San Juan to Helena Flights

The cheapest times to fly from San Juan 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 Juan to Helena are during the month of November. You can find some of the cheapest flights from San Juan to Helena with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from San Juan 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 Juan 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 Juan to Helena in 2025. You can also book with separate airlines for your outbound and return journeys, from $308 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 Juan 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 Juan 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.

 

San Juan to Helena Flights

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*Available to One Key members.