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$264+ Cheap flights from Helena to San Diego (HLN - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Apr 29 — May 61
Wed 4/29
Wed 5/6
1 adult, Economy
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Cheap 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 March 30, 2026.

This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/256:22 pm
HLN
-
SAN
1 stop16h 33m
Alaska Airlines
Sat 5/26:34 pm
SAN
-
HLN
1 stop22h 11m
Alaska Airlines
Deal found 3/28$337
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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.
Sat 5/26:22 pm
HLN
-
SAN
2 stops16h 47m
Alaska Airlines
Tue 5/510:51 am
SAN
-
HLN
1 stop5h 54m
Alaska Airlines
Deal found 3/26$378
This Delta deal was found by Cheapflights users on 3/27. 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.
Fri 9/115:45 am
HLN
-
SAN
1 stop4h 14m
Delta
Sun 9/135:00 pm
SAN
-
HLN
1 stop4h 34m
Delta
Deal found 3/27$449
This Alaska Airlines deal was found by Cheapflights users on 3/29. 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.
Wed 7/15:09 pm
HLN
-
SAN
2 stops23h 48m
Alaska Airlines
Wed 7/87:18 am
SAN
-
HLN
1 stop8h 14m
Alaska Airlines
Deal found 3/29$477
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 9/114:08 pm
HLN
-
SAN
2 stops16h 58m
Alaska Airlines
Sun 9/138:45 pm
SAN
-
HLN
1 stop17h 46m
Alaska Airlines
Deal found 3/27$492

Find 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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$337
(Expedia)

One-way from

$264
(Alaska Airlines)

Popular in

July

Cheapest in

November

Average price

$398
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
One-way flight from Helena to San Diego
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($108 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 30, 2026.
Use the filters below to find and compare flights from Helena to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 4/25

6:22 pm-9:55 am

1 stop16h 33m

San Diego

Sat 5/2

6:34 pm-5:45 pm

1 stop22h 11m

$337
Quickest round-trip

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-10:09 am

2 stops16h 47m

San Diego

Tue 5/5

10:51 am-5:45 pm

1 stop5h 54m

$378
Cheapest one-way

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 4/12

6:22 pm-8:28 pm

2 stops27h 06m

$264
Quickest one-way

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 4/12

5:30 am-8:45 am

1 stop4h 15m

$317

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 4/12

6:15 am-8:39 pm

3 stops15h 24m

$1,003

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Sorted by cheapest first

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Helena-San Diego flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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, March is the cheapest month in which you can book a flight from Helena to San Diego (average of $118). Flying from Helena to San Diego in January is currently the most expensive (average of $176). 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 March 30, 2026.
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
8,359 reviews

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Crew

8.5

Overall

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
7.9
Good
8,359 reviews
Delta
7.9
Good
8,359 reviews

Entertainment

7.8

Boarding

8.1

Comfort

7.9

Food

7.2

Crew

8.5

Overall

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 Alaska Airlines fly from Helena to San Diego in about 16h 33m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 997 mi.

  • 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 $301 on this airline. Delta is currently priced 28% 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, March is the cheapest month in which you can book a flight from Helena to San Diego (average of $118). Flying from Helena to San Diego in January is currently the most expensive (average of $176). 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
National City
Coronado
La Mesa
Poway
Julian
Lemon Grove

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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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$301Average$449FlexibilityNo cancel feeOn-timeN/A

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