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$279+ Cheap flights from Helena to San Diego (HLN - SAN)

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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Helena to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Helena (HLN) to San Diego (SAN). 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 August 18, 2025.

Round-trip from

$279
(Delta)

Popular in

September

Cheapest in

November

Average price

$297
From Helena to San Diego
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($74 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Helena to San Diego

Cheapest flights from Helena to San Diego
Explore the most affordable flight options available from Helena to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Delta deal was found by Cheapflights users on 8/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1212:50 pmHLN - SAN
1 stop6h 56mDelta
Sat 11/156:15 amSAN - HLN
1 stop5h 09mDelta
Deal found 8/18$279
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 11/126:13 pmHLN - SAN
1 stop5h 46mAlaska Airlines
Sat 11/157:57 amSAN - HLN
2 stops8h 39mAlaska Airlines
Deal found 8/18$310
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 9/195:20 pmHLN - SAN
1 stop5h 54mUnited Airlines
Sun 9/217:00 amSAN - HLN
1 stop8h 04mUnited Airlines
Deal found 8/18$399
This Delta deal was found by Cheapflights users on 8/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/181:00 pmHLN - SAN
1 stop4h 00mDelta
Sun 9/216:15 amSAN - HLN
1 stop5h 05mDelta
Deal found 8/16$418
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 9/194:02 pmHLN - SAN
1 stop5h 36mAlaska Airlines
Sun 9/218:59 pmSAN - HLN
2 stops17h 22mAlaska Airlines
Deal found 8/18$419
This Hawaiian Airlines deal was found by Cheapflights users on 8/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/314:02 pmHLN - SAN
1 stop6h 51mHawaiian Airlines
Thu 9/48:15 amSAN - HLN
1 stop6h 06mHawaiian Airlines
Deal found 8/16$532
This Delta deal was found by Cheapflights users on 8/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/311:00 pmHLN - SAN
1 stop3h 54mDelta
Thu 9/45:00 pmSAN - HLN
1 stop4h 13mDelta
Deal found 8/16$533
This Alaska Airlines deal was found by Cheapflights users on 8/16. 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.
Sun 8/314:02 pmHLN - SAN
1 stop6h 51mAlaska Airlines
Thu 9/48:21 amSAN - HLN
2 stops30h 00mAlaska Airlines
Deal found 8/16$543
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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.
Thu 9/184:02 pmHLN - SAN
1 stop7h 56mAlaska Airlines
Sun 9/218:59 pmSAN - HLN
2 stops17h 22mAlaska Airlines
Deal found 8/18$567

Cheapflights Fare Finder

 
Customize your flight search to find flights from Helena to San Diego 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 August 18, 2025.
Use the filters below to find and compare flights from Helena to San Diego that are best for you.

Fly from

Helena

Fly to

San Diego

Route

Depart

Return

Price

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 11/12

12:50 pm-6:46 pm

1 stop6h 56m

San Diego

Sat 11/15

6:15 am-12:24 pm

1 stop5h 09m

$279

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 11/12

6:13 pm-10:59 pm

1 stop5h 46m

San Diego

Sat 11/15

7:57 am-5:36 pm

2 stops8h 39m

$310

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 9/19

5:20 pm-10:14 pm

1 stop5h 54m

San Diego

Sun 9/21

7:00 am-4:04 pm

1 stop8h 04m

$399

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Thu 9/18

1:00 pm-4:00 pm

1 stop4h 00m

San Diego

Sun 9/21

6:15 am-12:20 pm

1 stop5h 05m

$418

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 9/19

4:02 pm-10:58 pm

1 stop7h 56m

San Diego

Sun 9/21

8:59 pm-3:21 pm

2 stops17h 22m

$419

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Best time to book a flight from Helena to San Diego

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

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

Currently, August is the cheapest month in which you can book a flight from Helena to San Diego (average of $286). Flying from Helena to San Diego in March is currently the most expensive (average of $366). 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 San Diego

Get insights into the airlines that provide service to San Diego. 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 San Diego. Reviews last updated August 18, 2025.
Get a feel of what it's like to fly with Delta from Helena to San Diego by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Helena to San Diego. 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 Helena to San Diego?

    Airlines like Delta, Alaska Airlines, and United Airlines fly from Helena to San Diego in about 5h 46m. The time it takes to get you to your destination can typically vary by up to 1h 10m. Airlines will cover a distance of 997 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Helena to San Diego round-trip?

    Our cheapest airline available from Helena to San Diego is Delta. Our recent data shows that you can find tickets from as low as $294 on this airline. Delta is currently priced 42% below the average price you’ll pay for this route.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Helena to San Diego (average of $286). Flying from Helena to San Diego in March is currently the most expensive (average of $366). 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

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
La Mesa
Poway
National City
Lemon Grove
Imperial Beach
Alpine

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Top airline flying from Helena to San Diego

Discover the top airline that operate flights from Helena to San Diego. 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$294Average$498FlexibilityNo cancel feeOn-timeN/A

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