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Cheap flights from Helena to San Diego from $161

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to San Diego departing on 4/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Helena to San Diego

Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
6:22 pm - 1:27 pm
HLN
-
SAN
20h 05m
1 stop
Alaska Airlines Logo
7:15 am - 5:45 pm
SAN
-
HLN
9h 30m
1 stop
$234Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 1:27 pm
HLN
-
SAN
20h 05m
1 stop
Alaska Airlines Logo
10:51 am - 5:45 pm
SAN
-
HLN
5h 54m
1 stop
$245Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 1:27 pm
HLN
-
SAN
20h 05m
1 stop
Alaska Airlines Logo
10:51 am - 5:45 pm
SAN
-
HLN
5h 54m
1 stop
$284Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 7:59 am
HLN
-
SAN
14h 37m
2 stops
Alaska Airlines Logo
10:51 am - 5:45 pm
SAN
-
HLN
5h 54m
1 stop
$315Alaska Airlines
Sat, May 2 - Wed, May 6
United Airlines Logo
2:25 pm - 9:22 pm
HLN
-
SAN
7h 57m
1 stop
United Airlines Logo
6:32 am - 1:39 pm
SAN
-
HLN
6h 07m
1 stop
$321United Airlines
Fri, Apr 10 - Fri, Apr 17
Alaska Airlines Logo
6:22 pm - 8:55 am
HLN
-
SAN
15h 33m
2 stops
Alaska Airlines Logo
10:51 am - 5:45 pm
SAN
-
HLN
5h 54m
1 stop
$322Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 7:59 am
HLN
-
SAN
14h 37m
2 stops
Alaska Airlines Logo
8:00 am - 5:45 pm
SAN
-
HLN
8h 45m
2 stops
$333Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 12:20 pm
HLN
-
SAN
18h 58m
2 stops
Alaska Airlines Logo
10:51 am - 5:45 pm
SAN
-
HLN
5h 54m
1 stop
$344Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 1:27 pm
HLN
-
SAN
20h 05m
1 stop
Alaska Airlines Logo
10:51 am - 5:45 pm
SAN
-
HLN
5h 54m
1 stop
$352Alaska Airlines
Sat, May 2 - Wed, May 6
Alaska Airlines Logo
6:22 pm - 8:55 am
HLN
-
SAN
15h 33m
2 stops
Alaska Airlines Logo
8:00 am - 5:45 pm
SAN
-
HLN
8h 45m
2 stops
$357Alaska Airlines
Sat, May 2 - Wed, May 6

United Airlines flights from Helena to San Diego

Our best United Airlines deals on Helena to San Diego flight tickets
United Airlines
Apr 10
HLN2:25 pmHelena
7h 57m
1 stop
SAN9:22 pmSan Diego
Apr 17
SAN6:32 amSan Diego
6h 07m
1 stop
HLN1:39 pmHelena
$321
United Airlines
Apr 10
HLN6:15 amHelena
28h 01m
1 stop
SAN9:16 amSan Diego
Apr 17
SAN6:32 amSan Diego
6h 07m
1 stop
HLN1:39 pmHelena
$493
United Airlines
Mar 26
HLN2:30 pmHelena
7h 33m
1 stop
SAN9:03 pmSan Diego
Mar 30
SAN11:01 amSan Diego
9h 32m
2 stops
HLN9:33 pmHelena
$908

Delta flights from Helena to San Diego

Our best Delta deals on Helena to San Diego flight tickets
Delta
Apr 10
HLN1:02 pmHelena
6h 33m
1 stop
SAN6:35 pmSan Diego
Apr 17
SAN6:15 amSan Diego
5h 09m
1 stop
HLN12:24 pmHelena
$390
Delta
Apr 23
HLN1:04 pmHelena
6h 01m
1 stop
SAN6:05 pmSan Diego
Apr 26
SAN6:15 amSan Diego
5h 09m
1 stop
HLN12:24 pmHelena
$399
Delta
Sep 11
HLN5:45 amHelena
4h 14m
1 stop
SAN8:59 amSan Diego
Sep 13
SAN5:00 pmSan Diego
4h 34m
1 stop
HLN10:34 pmHelena
$429

momondo 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, momondo users made 832,500 searches. Data last updated March 16, 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

Sat 5/2

6:22 pm-1:27 pm

1 stop20h 05m

San Diego

Wed 5/6

7:15 am-5:45 pm

1 stop9h 30m

$234

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-1:27 pm

1 stop20h 05m

San Diego

Wed 5/6

10:51 am-5:45 pm

1 stop5h 54m

$245

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-1:27 pm

1 stop20h 05m

San Diego

Wed 5/6

10:51 am-5:45 pm

1 stop5h 54m

$284

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-7:59 am

2 stops14h 37m

San Diego

Wed 5/6

10:51 am-5:45 pm

1 stop5h 54m

$315
Quickest round-trip

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 4/10

2:25 pm-9:22 pm

1 stop7h 57m

San Diego

Fri 4/17

6:32 am-1:39 pm

1 stop6h 07m

$321

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-8:55 am

2 stops15h 33m

San Diego

Wed 5/6

10:51 am-5:45 pm

1 stop5h 54m

$322

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-7:59 am

2 stops14h 37m

San Diego

Wed 5/6

8:00 am-5:45 pm

2 stops8h 45m

$333

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-12:20 pm

2 stops18h 58m

San Diego

Wed 5/6

10:51 am-5:45 pm

1 stop5h 54m

$344

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-1:27 pm

1 stop20h 05m

San Diego

Wed 5/6

10:51 am-5:45 pm

1 stop5h 54m

$352

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/2

6:22 pm-8:55 am

2 stops15h 33m

San Diego

Wed 5/6

8:00 am-5:45 pm

2 stops8h 45m

$357

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Diego from

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

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

Alaska Airlines and Delta are the most popular carriers 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 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 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?

  • 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?

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
DeltaPriceFrom $257Free CancellationRating
7.9
8,296 reviews
Search Delta flights

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Coronado
Chula Vista
El Cajon
Julian
National City
Poway
San Ysidro
Imperial Beach
La Mesa
Borrego Springs
Alpine
Santee
Lemon Grove

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.

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