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Cheap flights from Helena to San Diego from $238

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 9/9. 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

Discover deals from 900+ travel sites with momondo.

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
5:11 pm - 11:44 pm
HLN
-
SAN
7h 33m
1 stop
Alaska Airlines Logo
7:15 am - 4:34 pm
SAN
-
HLN
8h 19m
1 stop
$343Alaska Airlines
Wed, Aug 26 - Wed, Sep 2
Alaska Airlines Logo
4:41 pm - 10:31 pm
HLN
-
SAN
6h 50m
1 stop
Alaska Airlines Logo
9:15 am - 4:04 pm
SAN
-
HLN
5h 49m
1 stop
$363Alaska Airlines
Wed, Nov 4 - Sat, Nov 7
Alaska Airlines Logo
5:11 pm - 12:35 pm
HLN
-
SAN
20h 24m
2 stops
Alaska Airlines Logo
6:15 am - 4:34 pm
SAN
-
HLN
9h 19m
1 stop
$385Alaska Airlines
Wed, Aug 26 - Wed, Sep 2
Alaska Airlines Logo
4:41 pm - 11:43 am
HLN
-
SAN
20h 02m
2 stops
Alaska Airlines Logo
9:15 am - 4:04 pm
SAN
-
HLN
5h 49m
1 stop
$407Alaska Airlines
Wed, Nov 4 - Sat, Nov 7
Alaska Airlines Logo
4:41 pm - 4:54 pm
HLN
-
SAN
25h 13m
2 stops
Alaska Airlines Logo
9:15 am - 4:04 pm
SAN
-
HLN
5h 49m
1 stop
$425Alaska Airlines
Wed, Nov 4 - Sat, Nov 7
Alaska Airlines Logo
5:11 pm - 10:39 am
HLN
-
SAN
18h 28m
1 stop
Alaska Airlines Logo
9:07 pm - 4:41 pm
SAN
-
HLN
18h 34m
2 stops
$428Alaska Airlines
Mon, Aug 31 - Mon, Sep 7
Alaska Airlines Logo
5:11 pm - 8:35 am
HLN
-
SAN
16h 24m
2 stops
Alaska Airlines Logo
7:45 am - 4:34 pm
SAN
-
HLN
7h 49m
2 stops
$434Alaska Airlines
Wed, Aug 26 - Wed, Sep 2
Alaska Airlines Logo
5:11 pm - 1:19 pm
HLN
-
SAN
21h 08m
1 stop
Alaska Airlines Logo
6:15 am - 4:34 pm
SAN
-
HLN
9h 19m
1 stop
$453Alaska Airlines
Mon, Aug 31 - Mon, Sep 7
Alaska Airlines Logo
4:41 pm - 8:42 am
HLN
-
SAN
17h 01m
2 stops
Alaska Airlines Logo
7:03 am - 4:04 pm
SAN
-
HLN
8h 01m
2 stops
$454Alaska Airlines
Wed, Nov 4 - Sat, Nov 7
Alaska Airlines Logo
5:18 pm - 1:21 pm
HLN
-
SAN
21h 03m
1 stop
Alaska Airlines Logo
7:15 am - 4:41 pm
SAN
-
HLN
8h 26m
1 stop
$463Alaska Airlines
Fri, Sep 11 - Sun, Sep 13

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Alaska Airlines flights from Helena to San Diego

Our best Alaska Airlines deals on Helena to San Diego flight tickets
Alaska Airlines
Aug 26
HLN5:11 pmHelena
7h 33m
1 stop
SAN11:44 pmSan Diego
Sep 2
SAN7:15 amSan Diego
8h 19m
1 stop
HLN4:34 pmHelena
$343
Alaska Airlines
Nov 4
HLN4:41 pmHelena
6h 50m
1 stop
SAN10:31 pmSan Diego
Nov 7
SAN9:15 amSan Diego
5h 49m
1 stop
HLN4:04 pmHelena
$363
Alaska Airlines
Aug 26
HLN5:11 pmHelena
20h 24m
2 stops
SAN12:35 pmSan Diego
Sep 2
SAN6:15 amSan Diego
9h 19m
1 stop
HLN4:34 pmHelena
$385

Delta flights from Helena to San Diego

Our best Delta deals on Helena to San Diego flight tickets
Delta
Nov 23
HLN12:50 pmHelena
10h 59m
2 stops
SAN10:49 pmSan Diego
Nov 27
SAN6:15 amSan Diego
5h 09m
1 stop
HLN12:24 pmHelena
$519
Delta
Nov 22
HLN12:50 pmHelena
10h 59m
2 stops
SAN10:49 pmSan Diego
Nov 27
SAN6:15 amSan Diego
5h 09m
1 stop
HLN12:24 pmHelena
$520
Delta
Aug 9
HLN5:40 amHelena
4h 01m
1 stop
SAN8:41 amSan Diego
Aug 15
SAN5:01 pmSan Diego
4h 29m
1 stop
HLN10:30 pmHelena
$584

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 July 11, 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

Wed 8/26

5:11 pm-11:44 pm

1 stop7h 33m

San Diego

Wed 9/2

7:15 am-4:34 pm

1 stop8h 19m

$343
Quickest round-trip

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 11/4

4:41 pm-10:31 pm

1 stop6h 50m

San Diego

Sat 11/7

9:15 am-4:04 pm

1 stop5h 49m

$363

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 8/26

5:11 pm-12:35 pm

2 stops20h 24m

San Diego

Wed 9/2

6:15 am-4:34 pm

1 stop9h 19m

$385

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 11/4

4:41 pm-11:43 am

2 stops20h 02m

San Diego

Sat 11/7

9:15 am-4:04 pm

1 stop5h 49m

$407

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 11/4

4:41 pm-4:54 pm

2 stops25h 13m

San Diego

Sat 11/7

9:15 am-4:04 pm

1 stop5h 49m

$425

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 8/31

5:11 pm-10:39 am

1 stop18h 28m

San Diego

Mon 9/7

9:07 pm-4:41 pm

2 stops18h 34m

$428

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 8/26

5:11 pm-8:35 am

2 stops16h 24m

San Diego

Wed 9/2

7:45 am-4:34 pm

2 stops7h 49m

$434

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Mon 8/31

5:11 pm-1:19 pm

1 stop21h 08m

San Diego

Mon 9/7

6:15 am-4:34 pm

1 stop9h 19m

$453

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 11/4

4:41 pm-8:42 am

2 stops17h 01m

San Diego

Sat 11/7

7:03 am-4:04 pm

2 stops8h 01m

$454

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 9/11

5:18 pm-1:21 pm

1 stop21h 03m

San Diego

Sun 9/13

7:15 am-4:41 pm

1 stop8h 26m

$463

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

Can stopping save me money on Helena to San Diego flights?

You could potentially save up to 9% on your flight if you consider stops on a Helena to San Diego flight.

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

6h 11m

Direct flights

None
The fastest flight from Helena to San Diego takes 6h 11m
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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Frequently asked questions about flying from Helena to San Diego

  • 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 6h 11m.

  • 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 $306Free CancellationRating
7.8
8,457 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
Chula Vista
Coronado
El Cajon
Julian
National City
La Mesa
Poway
San Ysidro
Imperial Beach
Borrego Springs
Santee
Lemon Grove
Alpine

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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