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 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 November 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

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One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:10 pm - 8:42 pmHLN-SAN

5h 32m1 stop

7:00 am - 3:43 pmSAN-HLN

7h 43m1 stop

$322Hawaiian Airlines

Find Deal

Sat, Feb 28 - Tue, Mar 3

12:50 pm - 10:47 pmHLN-SAN

10h 57m2 stops

11:05 am - 12:27 pmSAN-HLN

24h 22m2 stops

$324Delta

Find Deal

Sat, Feb 28 - Tue, Mar 3

5:35 am - 9:11 amHLN-SAN

4h 36m1 stop

11:05 am - 12:27 pmSAN-HLN

24h 22m2 stops

$336Delta

Find Deal

Sat, Feb 28 - Tue, Mar 3

4:10 pm - 8:42 pmHLN-SAN

5h 32m1 stop

8:59 pm - 3:43 pmSAN-HLN

17h 44m2 stops

$351Alaska Airlines

Find Deal

Sat, Feb 28 - Tue, Mar 3

1:07 pm - 8:46 pmHLN-SAN

8h 39m2 stops

11:00 am - 10:29 pmSAN-HLN

10h 29m2 stops

$364Delta

Find Deal

Sat, Feb 28 - Tue, Mar 3

5:35 am - 9:11 amHLN-SAN

4h 36m1 stop

6:15 am - 12:23 pmSAN-HLN

5h 08m1 stop

$374Delta

Find Deal

Mon, Apr 6 - Sun, Apr 19

6:28 pm - 12:47 pmHLN-SAN

19h 19m1 stop

8:58 pm - 5:51 pmSAN-HLN

43h 53m2 stops

$412Alaska Airlines

Find Deal

Tue, Dec 2 - Sun, Dec 7

4:10 pm - 7:14 amHLN-SAN

16h 04m2 stops

7:00 am - 3:38 pmSAN-HLN

7h 38m1 stop

$455Alaska Airlines

Find Deal

Mon, Apr 6 - Sun, Apr 19

2:30 pm - 8:51 pmHLN-SAN

7h 21m1 stop

6:30 am - 1:27 pmSAN-HLN

5h 57m1 stop

$593United Airlines

Find Deal

Sat, Mar 21 - Sat, Mar 28

2:30 pm - 8:51 pmHLN-SAN

7h 21m1 stop

6:30 am - 1:27 pmSAN-HLN

29h 57m2 stops

$608United Airlines

Find Deal

Sat, Mar 21 - Sat, Mar 28

Delta flights from Helena to San Diego

Our best Delta deals on Helena to San Diego flight tickets

Delta

Feb 28

HLN12:50 pmHelena

10h 57m

2 stops

SAN10:47 pmSan Diego

Mar 3

SAN11:05 amSan Diego

24h 22m

2 stops

HLN12:27 pmHelena

$324

Find similar

Delta

Feb 28

HLN5:35 amHelena

4h 36m

1 stop

SAN9:11 amSan Diego

Mar 3

SAN11:05 amSan Diego

24h 22m

2 stops

HLN12:27 pmHelena

$336

Find similar

Delta

Feb 28

HLN1:07 pmHelena

8h 39m

2 stops

SAN8:46 pmSan Diego

Mar 3

SAN11:00 amSan Diego

10h 29m

2 stops

HLN10:29 pmHelena

$364

Find similar

Alaska Airlines flights from Helena to San Diego

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

Alaska Airlines

Feb 28

HLN4:10 pmHelena

5h 32m

1 stop

SAN8:42 pmSan Diego

Mar 3

SAN8:59 pmSan Diego

17h 44m

2 stops

HLN3:43 pmHelena

$351

Find similar

Alaska Airlines

Dec 2

HLN6:28 pmHelena

19h 19m

1 stop

SAN12:47 pmSan Diego

Dec 7

SAN8:58 pmSan Diego

43h 53m

2 stops

HLN5:51 pmHelena

$412

Find similar

Alaska Airlines

Apr 6

HLN4:10 pmHelena

16h 04m

2 stops

SAN7:14 amSan Diego

Apr 19

SAN6:15 amSan Diego

8h 23m

1 stop

HLN3:38 pmHelena

$455

Find similar

Fly from

Fly to

Route

Depart

Return

Price

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 2/28

4:10 pm-8:42 pm

1 stop5h 32m

San Diego

Tue 3/3

7:00 am-3:43 pm

1 stop7h 43m

$322

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 2/28

12:50 pm-10:47 pm

2 stops10h 57m

San Diego

Tue 3/3

11:05 am-12:27 pm

2 stops24h 22m

$324

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 2/28

5:35 am-9:11 am

1 stop4h 36m

San Diego

Tue 3/3

11:05 am-12:27 pm

2 stops24h 22m

$336

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 2/28

4:10 pm-8:42 pm

1 stop5h 32m

San Diego

Tue 3/3

8:59 pm-3:43 pm

2 stops17h 44m

$351

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 2/28

1:07 pm-8:46 pm

2 stops8h 39m

San Diego

Tue 3/3

11:00 am-10:29 pm

2 stops10h 29m

$364

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 4/6

5:35 am-9:11 am

1 stop4h 36m

San Diego

Sun 4/19

6:15 am-12:23 pm

1 stop5h 08m

$374

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Tue 12/2

6:28 pm-12:47 pm

1 stop19h 19m

San Diego

Sun 12/7

8:58 pm-5:51 pm

2 stops43h 53m

$412

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 4/6

4:10 pm-7:14 am

2 stops16h 04m

San Diego

Sun 4/19

7:00 am-3:38 pm

1 stop7h 38m

$455

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 3/21

2:30 pm-8:51 pm

1 stop7h 21m

San Diego

Sat 3/28

6:30 am-1:27 pm

1 stop5h 57m

$593

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 3/21

2:30 pm-8:51 pm

1 stop7h 21m

San Diego

Sat 3/28

6:30 am-1:27 pm

2 stops29h 57m

$608

Flights are sorted by cheapest round-trip flights first.

Sorted 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

Direct flights	None

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

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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 28m.
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 November 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 $254	Free Cancellation	Rating 7.9 8,001 reviews		Search Delta flights

Coronado

Chula Vista

El Cajon

Julian

National City

La Mesa

Imperial Beach

Poway

Borrego Springs

San Ysidro

Lemon Grove

Alpine

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.