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

Delta and United Airlines are the most popular carriers operating from Helena to San Diego

What airlines fly to San Diego?

Delta, Alaska Airlines and Southwest 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 49% 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 December 2025.

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.

$235 Cheap Flights from Helena to San Diego in 2025/26

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Find the cheapest flights from Helena to San Diego

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:10 pm - 4:37 pm

HLN

SAN

4h 27m1 stop

6:15 am - 12:27 pm

SAN

HLN

5h 12m1 stop

$237Delta

Wed, Jan 14 - Wed, Jan 21

4:36 pm - 11:03 pm

HLN

SAN

7h 27m1 stop

8:39 am - 3:59 pm

SAN

HLN

6h 20m1 stop

$274Alaska Airlines

Fri, Feb 27 - Wed, Mar 4

4:36 pm - 9:49 pm

HLN

SAN

6h 13m1 stop

8:39 am - 3:59 pm

SAN

HLN

6h 20m1 stop

$284Alaska Airlines

Wed, Feb 18 - Wed, Feb 25

6:48 pm - 8:35 am

HLN

SAN

14h 47m2 stops

9:37 am - 6:11 pm

SAN

HLN

7h 34m1 stop

$286Alaska Airlines

Wed, Jan 14 - Wed, Jan 21

2:27 pm - 8:42 pm

HLN

SAN

7h 15m1 stop

6:30 am - 1:41 pm

SAN

HLN

6h 11m1 stop

$289United Airlines

Wed, Jan 14 - Wed, Jan 21

5:30 am - 8:50 am

HLN

SAN

4h 20m1 stop

6:15 am - 12:25 pm

SAN

HLN

5h 10m1 stop

$299Delta

Wed, Feb 11 - Wed, Feb 18

4:36 pm - 9:34 am

HLN

SAN

17h 58m2 stops

8:19 pm - 3:59 pm

SAN

HLN

18h 40m2 stops

$305Alaska Airlines

Fri, Feb 27 - Wed, Mar 4

4:36 pm - 9:34 am

HLN

SAN

17h 58m2 stops

6:15 am - 3:59 pm

SAN

HLN

8h 44m1 stop

$307Alaska Airlines

Fri, Feb 27 - Wed, Mar 4

6:48 pm - 10:07 am

HLN

SAN

16h 19m1 stop

8:28 pm - 6:11 pm

SAN

HLN

20h 43m2 stops

$310Alaska Airlines

Mon, Feb 2 - Fri, Feb 6

6:48 pm - 11:51 am

HLN

SAN

18h 03m2 stops

9:37 am - 6:11 pm

SAN

HLN

7h 34m1 stop

$312Alaska Airlines

Sat, Jan 24 - Wed, Jan 28

Alaska Airlines flights from Helena to San Diego

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

Alaska Airlines

Feb 27

HLN4:36 pmHelena

28h 51m

2 stops

SAN8:27 pmSan Diego

Mar 4

SAN8:39 amSan Diego

6h 20m

1 stop

HLN3:59 pmHelena

$271

Find similar

Alaska Airlines

Feb 27

HLN4:36 pmHelena

7h 27m

1 stop

SAN11:03 pmSan Diego

Mar 4

SAN6:15 amSan Diego

8h 44m

1 stop

HLN3:59 pmHelena

$274

Find similar

Alaska Airlines

Feb 18

HLN4:36 pmHelena

6h 13m

1 stop

SAN9:49 pmSan Diego

Feb 25

SAN8:39 amSan Diego

6h 20m

1 stop

HLN3:59 pmHelena

$284

Find similar

Delta flights from Helena to San Diego

Our best Delta deals on Helena to San Diego flight tickets

Delta

Jan 14

HLN1:10 pmHelena

4h 27m

1 stop

SAN4:37 pmSan Diego

Jan 21

SAN6:15 amSan Diego

5h 12m

1 stop

HLN12:27 pmHelena

$237

Find similar

Delta

Feb 11

HLN5:30 amHelena

4h 20m

1 stop

SAN8:50 amSan Diego

Feb 18

SAN6:15 amSan Diego

5h 10m

1 stop

HLN12:25 pmHelena

$299

Find similar

Delta

Mar 13

HLN12:59 pmHelena

3h 56m

1 stop

SAN3:55 pmSan Diego

Mar 20

SAN6:15 amSan Diego

5h 04m

1 stop

HLN12:19 pmHelena

$349

Find similar

Fly from

Fly to

Route

Depart

Return

Price

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 1/14

1:10 pm-4:37 pm

1 stop4h 27m

San Diego

Wed 1/21

6:15 am-12:27 pm

1 stop5h 12m

$237

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 2/27

4:36 pm-11:03 pm

1 stop7h 27m

San Diego

Wed 3/4

8:39 am-3:59 pm

1 stop6h 20m

$274

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 1/14

6:48 pm-8:35 am

2 stops14h 47m

San Diego

Wed 1/21

9:37 am-6:11 pm

1 stop7h 34m

$286

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 1/14

2:27 pm-8:42 pm

1 stop7h 15m

San Diego

Wed 1/21

6:30 am-1:41 pm

1 stop6h 11m

$289

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

8:19 pm-3:59 pm

2 stops18h 40m

$305

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

Mon 2/2

6:48 pm-10:07 am

1 stop16h 19m

San Diego

Fri 2/6

8:28 pm-6:11 pm

2 stops20h 43m

$310

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

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 day to depart on your flight to San Diego?

The cheapest day to depart from Helena to San Diego is on a Wednesday. Travelers who choose to depart for San Diego on a Wednesday will often find tickets for as low as $406. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $634. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

What is the cheapest time of day to depart on your flight to San Diego?

The cheapest time of day to fly to San Diego is in the afternoon when flights can be purchased for as low as $391. Flights in the morning are often more expensive with an average ticket price of $577.

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	3h 56m
Direct flights	None

The fastest flight from Helena to San Diego takes 3h 56m

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 3h 56m.
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 December 2025.
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 8,008 reviews		Search Delta flights

Coronado

Chula Vista

El Cajon

Julian

National City

Poway

Imperial Beach

Borrego Springs

La Mesa

San Ysidro

Alpine

Lemon Grove

Santee

Why use momondo?

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.