How long is the flight from Helena to San Diego?

Airlines like Alaska Airlines and Delta fly from Helena to San Diego in about 4h 20m. The time it takes to get you to your destination can typically vary by up to 1h 53m. 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 $229 on this airline. Delta is currently priced 48% below the average price you’ll pay for this route.

In terms of precipitation, rainfall in San Diego ranges from 0.0 - 2.3 inches per month. February is typically the wettest month, when rainfall can reach 2.3 in. July is typically the driest time to visit San Diego when rainfall is around 0.0 in.

If weather is an important factor for your trip to San Diego, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).

What is the cheapest time of day to fly from HLN to SAN?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Helena to San Diego as you normally would.

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.

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.

$284+ Flights from Helena to San Diego

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1. Tell us where you want to go

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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 December 16, 2025.

Wed 12/312:26 pmHLN - SAN

1 stop7h 21mUnited Airlines

Sun 1/46:55 pmSAN - HLN

1 stop17h 50mUnited Airlines

Deal found 12/15

$654

Best flights from Helena to San Diego
Discover carefully curated flight deals from Helena to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 16, 2025.

Wed 2/184:36 pmHLN - SAN

1 stop6h 13mAlaska Airlines

Wed 2/258:39 amSAN - HLN

1 stop6h 20mAlaska Airlines

Deal found 12/14

$284

Wed 2/115:30 amHLN - SAN

1 stop4h 20mDelta

Wed 2/186:15 amSAN - HLN

1 stop5h 10mDelta

Deal found 12/14

$299

Fri 2/132:25 pmHLN - SAN

1 stop7h 26mUnited Airlines

Fri 2/2012:55 pmSAN - HLN

1 stop7h 21mUnited Airlines

Deal found 12/14

$329

Fri 2/274:36 pmHLN - SAN

2 stops17h 58mAlaska Airlines

Wed 3/46:15 amSAN - HLN

1 stop8h 44mAlaska Airlines

Deal found 12/16

$307

Sat 1/246:48 pmHLN - SAN

2 stops18h 03mAlaska Airlines

Wed 1/289:37 amSAN - HLN

1 stop7h 34mAlaska Airlines

Deal found 12/15

$312

Wed 2/184:36 pmHLN - SAN

1 stop7h 27mAlaska Airlines

Sun 2/228:04 pmSAN - HLN

2 stops18h 55mAlaska Airlines

Deal found 12/16

$325

Wed 2/116:48 pmHLN - SAN

2 stops20h 22mAlaska Airlines

Wed 2/188:19 pmSAN - HLN

2 stops18h 40mAlaska Airlines

Deal found 12/14

$335

Last-minute flights from Helena to San Diego
Discover last-minute flight deals from Helena to San Diego. Data last updated December 16, 2025 and is based on user searches.

Wed 12/312:26 pmHLN - SAN

1 stop7h 21mUnited Airlines

Sun 1/46:55 pmSAN - HLN

1 stop17h 50mUnited Airlines

Deal found 12/15

$654

Sat 1/246:48 pmHLN - SAN

2 stops18h 03mAlaska Airlines

Wed 1/289:37 amSAN - HLN

1 stop7h 34mAlaska Airlines

Deal found 12/15

$312

One-way flights from Helena to San Diego
Search for one-way flight options from Helena to San Diego. Find affordable one-way fares based on user searches. Data last updated December 16, 2025.

Sat 12/275:30 amHLN - SAN

1 stop4h 25mDelta

Deal found 12/16

$430

Sat 12/276:10 amHLN - SAN

2 stops19h 05mUnited Airlines

Deal found 12/16

$648

Find flight deals from Helena to San Diego

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$284 (Alaska Airlines)
Popular in	July
Cheapest in	November
Average price	$328

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. 15% potential increase in price ($83 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 8% potential price decrease ($33 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/18

4:36 pm-9:49 pm

1 stop6h 13m

San Diego

Wed 2/25

8:39 am-3:59 pm

1 stop6h 20m

$284

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/11

5:30 am-8:50 am

1 stop4h 20m

San Diego

Wed 2/18

6:15 am-12:25 pm

1 stop5h 10m

$299

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 2/27

4:36 pm-9:34 am

2 stops17h 58m

San Diego

Wed 3/4

6:15 am-3:59 pm

1 stop8h 44m

$307

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 1/24

6:48 pm-11:51 am

2 stops18h 03m

San Diego

Wed 1/28

9:37 am-6:11 pm

1 stop7h 34m

$312

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/18

4:36 pm-11:03 pm

1 stop7h 27m

San Diego

Sun 2/22

8:04 pm-3:59 pm

2 stops18h 55m

$325

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 2/13

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Fri 2/20

12:55 pm-9:16 pm

1 stop7h 21m

$329

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/11

6:48 pm-2:10 pm

2 stops20h 22m

San Diego

Wed 2/18

8:19 pm-3:59 pm

2 stops18h 40m

$335

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 12/27

5:30 am-10:35 am

1 stop6h 05m

$430

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 12/27

6:10 am-12:15 am

2 stops19h 05m

$648

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Compare providers for flights from Helena to San Diego

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust 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 December is currently the most expensive (average of $181). 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 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

8,008 reviews

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

8,008 reviews

Delta

7.9

Good

8,008 reviews

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

How long is the flight from Helena to San Diego?
Airlines like Alaska Airlines and Delta fly from Helena to San Diego in about 4h 20m. The time it takes to get you to your destination can typically vary by up to 1h 53m. 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 $229 on this airline. Delta is currently priced 48% 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 December is currently the most expensive (average of $181). 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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Other flights to San Diego

Top airline flying from Helena to San Diego

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$301	Average$458	FlexibilityNo cancel fee	On-timeN/A

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$284+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Helena to San Diego with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Helena to San Diego

Cheapest flights from Helena to San DiegoExplore 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 December 16, 2025.

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 December 16, 2025.

Find flight deals from Helena to San Diego

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

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 December.

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.

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?

Reviews of airlines servicing San Diego

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.

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?

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

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

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

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

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

Traveling to a place near San Diego?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Helena to San Diego

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Top airline flying from Helena to San Diego

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Travel Smart

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 December 16, 2025.