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Helena

$329+ Cheap flights from San Diego to Helena (SAN - HLN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — HLN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from San Diego to Helena

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to Helena (HLN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$329
(Alaska Airlines)

Popular in

June

Cheapest in

July

Average price

$363
From San Diego to Helena
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($17 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from San Diego to Helena

Cheapest flights from San Diego to Helena
Explore the most affordable flight options available from San Diego to Helena. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/107:50 pmSAN - HLN
1 stop20h 51mAlaska Airlines
Mon 10/136:18 pmHLN - SAN
2 stops21h 48mAlaska Airlines
Deal found 9/10$329
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2912:52 pmSAN - HLN
1 stop7h 08mUnited Airlines
Fri 10/105:18 pmHLN - SAN
1 stop24h 59mUnited Airlines
Deal found 9/10$504
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/299:59 pmSAN - HLN
2 stops16h 22mAlaska Airlines
Fri 10/106:18 pmHLN - SAN
2 stops27h 01mAlaska Airlines
Deal found 9/10$513
This United Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:00 amSAN - HLN
1 stop5h 30mUnited Airlines
Sun 9/285:18 pmHLN - SAN
1 stop5h 57mUnited Airlines
Deal found 9/9$605
This Alaska Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:00 amSAN - HLN
2 stops7h 21mAlaska Airlines
Sun 9/284:02 pmHLN - SAN
2 stops8h 42mAlaska Airlines
Deal found 9/9$1,555

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego to Helena that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from San Diego to Helena that are best for you.

Fly from

San Diego

Fly to

Helena

Route

Depart

Return

Price

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Fri 10/10

7:50 pm-5:41 pm

1 stop20h 51m

Helena

Mon 10/13

6:18 pm-3:06 pm

2 stops21h 48m

$329

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Mon 9/29

12:52 pm-9:00 pm

1 stop7h 08m

Helena

Fri 10/10

5:18 pm-5:17 pm

1 stop24h 59m

$504

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Mon 9/29

7:15 am-3:21 pm

1 stop7h 06m

Helena

Fri 10/10

6:18 pm-8:19 pm

2 stops27h 01m

$513

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Wed 9/24

7:00 am-1:30 pm

1 stop5h 30m

Helena

Sun 9/28

5:18 pm-10:15 pm

1 stop5h 57m

$605

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Wed 9/24

7:00 am-3:21 pm

2 stops7h 21m

Helena

Sun 9/28

4:02 pm-11:44 pm

2 stops8h 42m

$1,555

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Thu 9/18

6:15 am-3:21 pm

1 stop8h 06m

$414

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Best time to book a flight from San Diego to Helena

Have a flexible travel schedule? Discover the best time to fly to Helena from San Diego 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 San Diego to Helena

What is the cheapest month to book a flight from San Diego to Helena?

Currently, February is the cheapest month in which you can book a flight from San Diego to Helena (average of $353). Flying from San Diego 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.

Reviews of airlines servicing Helena

Get insights into the airlines that provide service to Helena. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Helena. Reviews last updated September 11, 2025.
See what other customers who have flown with Alaska Airlines and Delta from San Diego to Helena have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

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

  • How long is the flight from San Diego to Helena?

    Airlines like Alaska Airlines and United Airlines fly from San Diego to Helena in about 7h 08m. The time it takes to get you to your destination can typically vary by up to 13h 43m. The distance between San Diego and Helena is about 997 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from San Diego to Helena round-trip?

    Flying on Delta is currently your cheapest option to Helena, with prices starting at $219. Another option worth looking into is Alaska Airlines, starting at $293 round trip. Users have found that Delta is 46% cheaper than the other options available to this destination.

  • Can I find deals for flights from San Diego to Helena that include hotel bookings?

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

  • How can I find direct flights from San Diego to Helena?

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

  • Can I find deals for business class flights from San Diego to Helena?

    Yes. Cheapflights offers flight deals from San Diego 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 San Diego to Helena?

    Currently, February is the cheapest month in which you can book a flight from San Diego to Helena (average of $353). Flying from San Diego 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.

See more FAQs

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Top 2 airlines flying from San Diego to Helena

Discover the top 2 airlines that operate flights from San Diego to Helena. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$219Average$328FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$293Average$363FlexibilityNo cancel feeOn-time75%

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