What is the cheapest airline that flies from Helena to San Diego?

Alaska Airlines is the most popular carrier operating from Helena to San Diego

What airlines fly to San Diego?

Delta, Alaska Airlines and United Airlines are the top three most popular airlines that fly to San Diego from Helena according to our data. Delta is the first choice among our users, with 51% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 6 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Helena Airport to San Diego Airport?

Prices for flights from Helena Airport to San Diego Airport were last updated today.

How many operators does momondo search for flights from Helena Airport to San Diego Airport?

The number of operators available for flights from Helena Airport to San Diego Airport is 1 as of January 2026.

How old do you have to be to fly from Helena Airport to San Diego Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Helena Airport to San Diego Airport.

What documentation or ID do you need to fly to San Diego Airport?

The necessary travel and health documents for your San Diego Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$217 Cheap Flights from Helena to San Diego in 2026

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Find the cheapest flights from Helena to San Diego

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:25 pm - 8:51 pm

HLN

SAN

7h 26m

1 stop

12:55 pm - 9:16 pm

SAN

HLN

7h 21m

1 stop

$217United Airlines

Wed, Feb 25 - Wed, Mar 4

4:36 pm - 11:03 pm

HLN

SAN

7h 27m

1 stop

3:07 pm - 3:59 pm

SAN

HLN

23h 52m

2 stops

$255Alaska Airlines

Wed, Feb 25 - Wed, Mar 4

2:25 pm - 8:51 pm

HLN

SAN

7h 26m

1 stop

6:30 am - 1:40 pm

SAN

HLN

6h 10m

1 stop

$282United Airlines

Tue, Feb 17 - Sat, Feb 21

4:36 pm - 11:03 pm

HLN

SAN

7h 27m

1 stop

6:15 am - 3:59 pm

SAN

HLN

8h 44m

1 stop

$283Alaska Airlines

Wed, Feb 25 - Sat, Feb 28

2:25 pm - 8:51 pm

HLN

SAN

7h 26m

1 stop

6:30 am - 1:40 pm

SAN

HLN

6h 10m

1 stop

$290United Airlines

Wed, Feb 18 - Sun, Feb 22

6:22 pm - 4:25 pm

HLN

SAN

23h 03m

2 stops

6:15 am - 5:45 pm

SAN

HLN

10h 30m

1 stop

$291Alaska Airlines

Mon, Apr 6 - Wed, Apr 8

4:36 pm - 9:49 pm

HLN

SAN

6h 13m

1 stop

2:16 pm - 3:59 pm

SAN

HLN

24h 43m

2 stops

$295Alaska Airlines

Wed, Feb 25 - Sat, Feb 28

6:22 pm - 3:53 pm

HLN

SAN

22h 31m

1 stop

7:35 pm - 5:45 pm

SAN

HLN

21h 10m

1 stop

$313Alaska Airlines

Fri, Apr 24 - Mon, Apr 27

6:22 pm - 11:58 pm

HLN

SAN

6h 36m

1 stop

6:15 am - 5:45 pm

SAN

HLN

10h 30m

1 stop

$322Alaska Airlines

Mon, Apr 6 - Wed, Apr 8

6:22 pm - 11:59 pm

HLN

SAN

6h 37m

1 stop

9:12 pm - 5:45 pm

SAN

HLN

19h 33m

2 stops

$323Alaska Airlines

Fri, Apr 24 - Mon, Apr 27

Alaska Airlines flights from Helena to San Diego

Our best Alaska Airlines deals on Helena to San Diego flight tickets

Alaska Airlines

Feb 25

HLN4:36 pmHelena

7h 27m

1 stop

SAN11:03 pmSan Diego

Mar 4

SAN3:07 pmSan Diego

23h 52m

2 stops

HLN3:59 pmHelena

$255

Alaska Airlines

Feb 25

HLN4:36 pmHelena

6h 13m

1 stop

SAN9:49 pmSan Diego

Feb 28

SAN6:15 amSan Diego

8h 44m

1 stop

HLN3:59 pmHelena

$271

Alaska Airlines

Feb 25

HLN4:36 pmHelena

7h 27m

1 stop

SAN11:03 pmSan Diego

Feb 28

SAN6:15 amSan Diego

8h 44m

1 stop

HLN3:59 pmHelena

$283

Delta flights from Helena to San Diego

Our best Delta deals on Helena to San Diego flight tickets

Delta

Apr 6

HLN1:02 pmHelena

6h 33m

1 stop

SAN6:35 pmSan Diego

Apr 19

SAN6:15 amSan Diego

5h 09m

1 stop

HLN12:24 pmHelena

$445

Delta

Apr 6

HLN1:02 pmHelena

6h 33m

1 stop

SAN6:35 pmSan Diego

Apr 19

SAN6:15 amSan Diego

5h 09m

1 stop

HLN12:24 pmHelena

$482

Fly from

Fly to

Route

Depart

Return

Price

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/25

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Wed 3/4

12:55 pm-9:16 pm

1 stop7h 21m

$217

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/25

4:36 pm-11:03 pm

1 stop7h 27m

San Diego

Wed 3/4

3:07 pm-3:59 pm

2 stops23h 52m

$255

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Tue 2/17

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Sat 2/21

6:30 am-1:40 pm

1 stop6h 10m

$282

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/25

4:36 pm-11:03 pm

1 stop7h 27m

San Diego

Sat 2/28

6:15 am-3:59 pm

1 stop8h 44m

$283

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/18

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Sun 2/22

6:30 am-1:40 pm

1 stop6h 10m

$290

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 4/6

6:22 pm-4:25 pm

2 stops23h 03m

San Diego

Wed 4/8

6:15 am-5:45 pm

1 stop10h 30m

$291

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/25

4:36 pm-9:49 pm

1 stop6h 13m

San Diego

Sat 2/28

2:16 pm-3:59 pm

2 stops24h 43m

$295

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 4/24

6:22 pm-3:53 pm

1 stop22h 31m

San Diego

Mon 4/27

7:35 pm-5:45 pm

1 stop21h 10m

$313

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 4/6

6:22 pm-11:58 pm

1 stop6h 36m

San Diego

Wed 4/8

6:15 am-5:45 pm

1 stop10h 30m

$322

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 4/24

6:22 pm-11:59 pm

1 stop6h 37m

San Diego

Mon 4/27

9:12 pm-5:45 pm

2 stops19h 33m

$323

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first

How to get the cheapest flight ticket from Helena to San Diego

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to San Diego?

If you are unable to visit San Diego during the month of November, then departing from Helena during the month August is also very affordable. Most momondo users find prices during this month for around $297.

When to book flights from Helena to San Diego

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to San Diego according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Helena to San Diego (HLN to SAN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Helena to San Diego

Fastest flight time	4h 14m
Direct flights	None

The fastest flight from Helena to San Diego takes 4h 14m

There are no direct flights from Helena to San Diego. There are no popular flight routes from Helena to San Diego.

Search flight deals

How far is Helena to San Diego by plane?
The distance between Helena and San Diego is about 995.5 mi. A reasonable flight in good conditions will take 4h 14m.
When did momondo last update prices for flights from Helena Airport to San Diego Airport?
Prices for flights from Helena Airport to San Diego Airport were last updated today.
How many operators does momondo search for flights from Helena Airport to San Diego Airport?
The number of operators available for flights from Helena Airport to San Diego Airport is 1 as of January 2026.
How old do you have to be to fly from Helena Airport to San Diego Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Helena Airport to San Diego Airport.
What documentation or ID do you need to fly to San Diego Airport?
The necessary travel and health documents for your San Diego Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Helena to San Diego?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Helena to San Diego is Delta (100% of total bookings).

Best airlines flying from Helena to San Diego

Compare and see reviews for airlines that fly from Helena to San Diego with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $301	Free Cancellation	Rating 7.9 8,128 reviews		Search Delta flights

Coronado

Chula Vista

El Cajon

Julian

Poway

National City

Imperial Beach

San Ysidro

Borrego Springs

La Mesa

Alpine

Lemon Grove

Santee

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Why should I use momondo to find a flight deal from Helena to San Diego?

It is quick and easy to find Helena to San Diego flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San Diego that suits you.

Can I find flights from Helena to San Diego with flexible booking policies on momondo?

Flights from Helena to San Diego with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Helena to San Diego?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Helena to San Diego.

I’m not ready to book a flight from Helena to San Diego right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Helena to San Diego now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to San Diego and let you know when they change.