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$282+ 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 11/136:13 pmHLN - SAN
2 stops21h 02mAlaska Airlines
Mon 11/178:29 pmSAN - HLN
2 stops20h 07mAlaska Airlines
Deal found 10/29$495
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 11/252:22 pmHLN - SAN
1 stop7h 32mUnited Airlines
Tue 12/24:11 pmSAN - HLN
1 stop20h 36mUnited Airlines
Deal found 10/28$556
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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
2 stops21h 02mAlaska Airlines
Sun 11/166:55 amSAN - HLN
2 stops9h 41mAlaska Airlines
Deal found 10/28$565
This Delta deal was found by Cheapflights users on 10/28. 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 11/125:30 amHLN - SAN
1 stop4h 18mDelta
Sun 11/166:15 amSAN - HLN
1 stop5h 11mDelta
Deal found 10/28$573

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$282
(Hawaiian Airlines)

Popular in

July

Cheapest in

November

Average price

$450
Provider with most accurate pricing for Helena-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Helena-San Diego flights.
Search Deals
From Helena to San Diego
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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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 October 30, 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

Sat 2/28

4:10 pm-8:42 pm

1 stop5h 32m

San Diego

Tue 3/3

7:00 am-3:43 pm

1 stop7h 43m

$282

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 2/28

12:50 pm-10:47 pm

2 stops10h 57m

San Diego

Tue 3/3

11:05 am-12:27 pm

2 stops24h 22m

$294

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 4/6

12:50 pm-6:52 pm

1 stop7h 02m

San Diego

Sun 4/19

6:15 am-12:23 pm

1 stop5h 08m

$349

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 2/1

5:59 pm-11:09 pm

1 stop6h 10m

San Diego

Fri 2/6

11:49 am-5:22 pm

1 stop28h 33m

$362

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 4/6

4:10 pm-9:08 am

2 stops17h 58m

San Diego

Sun 4/19

6:15 am-3:38 pm

1 stop8h 23m

$450

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Thu 11/27

5:30 am-8:48 am

1 stop4h 18m

$430

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Thu 11/27

6:40 am-10:21 am

2 stops28h 41m

$763

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Compare providers for flights from Helena to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Helena to San Diego in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Helena-San Diego flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Helena-San Diego flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Helena-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Helena-San Diego flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Helena-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, May is the cheapest month in which you can book a flight from Helena to San Diego (average of $110). Flying from Helena to San Diego in February is currently the most expensive (average of $179). 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.

How much does it cost to fly round-trip from Helena to San Diego?

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 October 30, 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
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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 Hawaiian Airlines and Delta fly from Helena to San Diego in about 5h 32m. The time it takes to get you to your destination can typically vary by up to 5h 25m. 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 $254 on this airline. Delta is currently priced 45% 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, May is the cheapest month in which you can book a flight from Helena to San Diego (average of $110). Flying from Helena to San Diego in February is currently the most expensive (average of $179). 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
Lemon Grove
National City

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$254Average$450FlexibilityNo cancel feeOn-timeN/A

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