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$343+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Jul 30 — Aug 61
Thu 7/30
Thu 8/6
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 June 30, 2026.

This Alaska Airlines deal was found by Cheapflights users on 6/25. 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.
Tue 9/15:11 pm
HLN
-
SAN
1 stop22h 33m
Alaska Airlines
Sat 9/58:45 pm
SAN
-
HLN
1 stop18h 49m
Alaska Airlines
Deal found 6/25$343
This Alaska Airlines deal was found by Cheapflights users on 6/25. 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 8/205:34 pm
HLN
-
SAN
1 stop7h 10m
Alaska Airlines
Sun 8/237:15 am
SAN
-
HLN
1 stop8h 40m
Alaska Airlines
Deal found 6/25$442
This Alaska Airlines deal was found by Cheapflights users on 6/29. 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.
Fri 9/115:18 pm
HLN
-
SAN
1 stop21h 03m
Alaska Airlines
Sun 9/136:15 am
SAN
-
HLN
1 stop9h 26m
Alaska Airlines
Deal found 6/29$443
This Delta deal was found by Cheapflights users on 6/25. 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 8/205:40 am
HLN
-
SAN
2 stops10h 36m
Delta
Sun 8/236:29 am
SAN
-
HLN
1 stop4h 46m
Delta
Deal found 6/25$447
This Expedia deal was found by Cheapflights users on 6/28. 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 10/174:48 pm
HLN
-
SAN
1 stop6h 10m
Alaska Airlines
Sun 10/256:15 am
SAN
-
HLN
1 stop8h 56m
Alaska Airlines
Deal found 6/28$463
This Delta deal was found by Cheapflights users on 6/28. 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.
Sat 10/171:03 pm
HLN
-
SAN
2 stops10h 48m
Delta
Sun 10/255:06 pm
SAN
-
HLN
1 stop4h 18m
Delta
Deal found 6/28$466
This Alaska Airlines deal was found by Cheapflights users on 6/27. 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 8/75:09 pm
HLN
-
SAN
2 stops22h 38m
Alaska Airlines
Mon 8/109:19 pm
SAN
-
HLN
2 stops18h 13m
Alaska Airlines
Deal found 6/27$481

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 June 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$343
(Alaska Airlines)
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

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 June 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

Tue 9/1

5:11 pm-2:44 pm

1 stop22h 33m

San Diego

Sat 9/5

8:45 pm-4:34 pm

1 stop18h 49m

$343

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Thu 8/20

5:34 pm-11:44 pm

1 stop7h 10m

San Diego

Sun 8/23

7:15 am-4:55 pm

1 stop8h 40m

$442

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 9/11

5:18 pm-1:21 pm

1 stop21h 03m

San Diego

Sun 9/13

6:15 am-4:41 pm

1 stop9h 26m

$443
Quickest round-trip

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Thu 8/20

5:40 am-3:16 pm

2 stops10h 36m

San Diego

Sun 8/23

6:29 am-12:15 pm

1 stop4h 46m

$447
Cheapest one-way
Quickest one-way

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 7/26

12:55 pm-3:56 pm

1 stop4h 01m

$408

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 7/26

2:20 pm-8:46 pm

1 stop7h 26m

$454

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 7/26

5:09 pm-2:08 pm

3 stops45h 59m

$796

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

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 June.
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.

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 June 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
7.8
Good
8,451 reviews

Comfort

7.8

Overall

7.8

Boarding

8.1

Entertainment

7.8

Crew

8.5

Food

7.2

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
7.8
Good
8,451 reviews
Delta
7.8
Good
8,451 reviews

Comfort

7.8

Overall

7.8

Boarding

8.1

Entertainment

7.8

Crew

8.5

Food

7.2

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 22h 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 $306 on this airline.

  • 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.

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
National City
Chula Vista
Poway
La Mesa
Coronado
Santee
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 June 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$306Average$448FlexibilityNo cancel feeOn-timeN/A

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