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

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

What airlines fly to Helena?

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Helena from San Diego according to our data. Alaska Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Helena. Keep in mind that there are 6 different airlines that fly to Helena on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from San Diego Airport to Helena Airport are updated daily.

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

As of October 2026, there is 1 operator available to choose from for flights from San Diego Airport to Helena Airport.

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

What documentation or ID do you need to fly to Helena Airport?

The required travel and health documents for your Helena Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Helena Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$353 Cheap Flights from San Diego to Helena in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Diego to Helena

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:15 am - 4:04 pmSAN San Diego-HLN Helena

5h 49m1 stop Seattle/Tacoma Intl

4:41 pm - 6:47 pmHLN Helena-SAN San Diego

27h 06m1 stop Seattle/Tacoma Intl

$353Alaska Airlines

Sat, Nov 14 - Tue, Nov 17

6:15 am - 4:04 pmSAN San Diego-HLN Helena

8h 49m1 stop Seattle/Tacoma Intl

4:41 pm - 2:47 pmHLN Helena-SAN San Diego

23h 06m1 stop Seattle/Tacoma Intl

$353Alaska Airlines

Sat, Nov 14 - Tue, Nov 17

8:36 am - 4:23 pmSAN San Diego-HLN Helena

6h 47m1 stop Seattle/Tacoma Intl

5:00 pm - 9:44 pmHLN Helena-SAN San Diego

5h 44m1 stop Seattle/Tacoma Intl

$383Alaska Airlines

Thu, Jan 21 - Mon, Jan 25

6:15 am - 4:04 pmSAN San Diego-HLN Helena

8h 49m1 stop Seattle/Tacoma Intl

4:41 pm - 6:31 pmHLN Helena-SAN San Diego

26h 50m2 stops Seattle/Tacoma Intl Sacramento Intl

$396Alaska Airlines

Sat, Nov 14 - Tue, Nov 17

5:05 pm - 10:26 pmSAN San Diego-HLN Helena

4h 21m1 stop Salt Lake City

5:30 am - 12:06 pmHLN Helena-SAN San Diego

7h 36m1 stop Salt Lake City

$629Delta

Fri, Dec 25 - Tue, Dec 29

11:21 am - 10:26 pmSAN San Diego-HLN Helena

10h 05m2 stops Seattle/Tacoma Intl Salt Lake City

5:30 am - 12:06 pmHLN Helena-SAN San Diego

7h 36m1 stop Salt Lake City

$634Delta

Fri, Dec 25 - Tue, Dec 29

5:05 pm - 10:26 pmSAN San Diego-HLN Helena

4h 21m1 stop Salt Lake City

5:30 am - 8:54 amHLN Helena-SAN San Diego

4h 24m1 stop Salt Lake City

$702Delta

Thu, Dec 24 - Sun, Dec 27

3:00 pm - 10:24 pmSAN San Diego-HLN Helena

6h 24m2 stops Los Angeles Salt Lake City

1:08 pm - 10:51 pmHLN Helena-SAN San Diego

10h 43m2 stops Salt Lake City Seattle/Tacoma Intl

$755Delta

Tue, Oct 13 - Sat, Oct 17

5:05 pm - 10:26 pmSAN San Diego-HLN Helena

4h 21m1 stop Salt Lake City

5:30 am - 8:54 amHLN Helena-SAN San Diego

4h 24m1 stop Salt Lake City

$762Delta

Thu, Dec 24 - Sat, Dec 26

Cheap last minute flights

Enter your travel dates to find the best prices.

10:21 pm - 4:49 pmSAN San Diego-HLN Helena

17h 28m2 stops Fresno Airterminal Seattle/Tacoma Intl

5:26 pm - 1:14 pmHLN Helena-SAN San Diego

20h 48m2 stops Seattle/Tacoma Intl Fresno Airterminal

$969Alaska Airlines

Sun, Oct 4 - Wed, Oct 7

9:20 am - 4:49 pmSAN San Diego-HLN Helena

6h 29m1 stop Seattle/Tacoma Intl

5:26 pm - 3:19 pmHLN Helena-SAN San Diego

22h 53m2 stops Seattle/Tacoma Intl Salt Lake City

$1,010Alaska Airlines

Sat, Oct 3 - Wed, Oct 7

6:15 am - 4:49 pmSAN San Diego-HLN Helena

9h 34m1 stop Seattle/Tacoma Intl

5:26 pm - 7:27 amHLN Helena-SAN San Diego

15h 01m2 stops Seattle/Tacoma Intl Fresno Airterminal

$1,016Alaska Airlines

Sun, Oct 4 - Wed, Oct 7

7:01 pm - 4:49 pmSAN San Diego-HLN Helena

20h 48m2 stops Fresno Airterminal Seattle/Tacoma Intl

5:26 pm - 11:59 pmHLN Helena-SAN San Diego

7h 33m1 stop Seattle/Tacoma Intl

$1,023Alaska Airlines

Sun, Oct 4 - Fri, Oct 9

7:01 pm - 4:49 pmSAN San Diego-HLN Helena

20h 48m2 stops Fresno Airterminal Seattle/Tacoma Intl

5:26 pm - 10:58 pmHLN Helena-SAN San Diego

6h 32m1 stop Seattle/Tacoma Intl

$1,023Alaska Airlines

Sun, Oct 4 - Thu, Oct 8

10:21 pm - 4:49 pmSAN San Diego-HLN Helena

17h 28m2 stops Fresno Airterminal Seattle/Tacoma Intl

5:26 pm - 9:58 pmHLN Helena-SAN San Diego

5h 32m1 stop Seattle/Tacoma Intl

$1,023Alaska Airlines

Sun, Oct 4 - Fri, Oct 9

7:01 pm - 4:49 pmSAN San Diego-HLN Helena

20h 48m2 stops Fresno Airterminal Seattle/Tacoma Intl

5:26 pm - 7:27 amHLN Helena-SAN San Diego

15h 01m2 stops Seattle/Tacoma Intl Fresno Airterminal

$1,060Alaska Airlines

Sun, Oct 4 - Thu, Oct 8

5:01 pm - 10:29 pmSAN San Diego-HLN Helena

4h 28m1 stop Salt Lake City

1:08 pm - 6:29 pmHLN Helena-SAN San Diego

6h 21m1 stop Salt Lake City

$1,070Delta

Sat, Oct 3 - Wed, Oct 7

6:15 am - 4:49 pmSAN San Diego-HLN Helena

9h 34m1 stop Seattle/Tacoma Intl

5:26 pm - 10:58 pmHLN Helena-SAN San Diego

6h 32m1 stop Seattle/Tacoma Intl

$1,070Alaska Airlines

Sun, Oct 4 - Fri, Oct 9

3:00 pm - 10:29 pmSAN San Diego-HLN Helena

6h 29m2 stops Los Angeles Salt Lake City

1:08 pm - 7:14 pmHLN Helena-SAN San Diego

7h 06m2 stops Salt Lake City Los Angeles

$1,080Delta

Sat, Oct 3 - Wed, Oct 7

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United Airlines flights from San Diego to Helena

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

United Airlines

Dec 24

SAN12:48 pmSan Diego

7h 49m

1 stop

HLN9:37 pmHelena

Dec 28

HLN6:20 amHelena

7h 51m

1 stop

SAN1:11 pmSan Diego

$596

United Airlines

Dec 24

SAN6:45 amSan Diego

6h 01m

1 stop

HLN1:46 pmHelena

Dec 26

HLN2:27 pmHelena

7h 10m

1 stop

SAN8:37 pmSan Diego

$814

United Airlines

Dec 24

SAN12:48 pmSan Diego

7h 49m

1 stop

HLN9:37 pmHelena

Dec 27

HLN2:27 pmHelena

10h 24m

2 stops

SAN11:51 pmSan Diego

$819

Alaska Airlines flights from San Diego to Helena

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

Alaska Airlines

Nov 14

SAN6:15 amSan Diego

8h 49m

1 stop

HLN4:04 pmHelena

Nov 17

HLN4:41 pmHelena

23h 06m

1 stop

SAN2:47 pmSan Diego

$353

Alaska Airlines

Jan 21

SAN8:36 amSan Diego

6h 47m

1 stop

HLN4:23 pmHelena

Jan 25

HLN5:00 pmHelena

5h 44m

1 stop

SAN9:44 pmSan Diego

$383

Alaska Airlines

Nov 14

SAN6:15 amSan Diego

8h 49m

1 stop

HLN4:04 pmHelena

Nov 17

HLN4:41 pmHelena

26h 50m

2 stops

SAN6:31 pmSan Diego

$396

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Sat 11/14

9:15 am-4:04 pm

1 stop5h 49m

Helena

Tue 11/17

4:41 pm-6:47 pm

1 stop27h 06m

$353

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Sat 11/14

6:15 am-4:04 pm

1 stop8h 49m

Helena

Tue 11/17

4:41 pm-2:47 pm

1 stop23h 06m

$353

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Thu 1/21

8:36 am-4:23 pm

1 stop6h 47m

Helena

Mon 1/25

5:00 pm-9:44 pm

1 stop5h 44m

$383

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Sat 11/14

6:15 am-4:04 pm

1 stop8h 49m

Helena

Tue 11/17

4:41 pm-6:31 pm

2 stops26h 50m

$396

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Fri 12/25

5:05 pm-10:26 pm

1 stop4h 21m

Helena

Tue 12/29

5:30 am-12:06 pm

1 stop7h 36m

$629

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Fri 12/25

11:21 am-10:26 pm

2 stops10h 05m

Helena

Tue 12/29

5:30 am-12:06 pm

1 stop7h 36m

$634

Quickest round-trip

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Thu 12/24

5:05 pm-10:26 pm

1 stop4h 21m

Helena

Sun 12/27

5:30 am-8:54 am

1 stop4h 24m

$702

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 10/13

3:00 pm-10:24 pm

2 stops6h 24m

Helena

Sat 10/17

1:08 pm-10:51 pm

2 stops10h 43m

$755

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Thu 12/24

5:05 pm-10:26 pm

1 stop4h 21m

Helena

Sat 12/26

5:30 am-8:54 am

1 stop4h 24m

$762

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

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 Helena?

If you aren’t able to travel to Helena during the month of April, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $0.

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

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

When to book flights from San Diego to Helena

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

Estimated round-trip price

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

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

Best Price Found	$353
Fastest flight time	5h 09m
Direct flights	None

The best flight deal from San Diego to Helena found on momondo in the last 72 hours is $353

The fastest flight from San Diego to Helena takes 5h 09m

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

Search flight deals

Frequently asked questions about flying from San Diego to Helena

How far is San Diego to Helena by plane?
San Diego and Helena are 995.5 mi apart from one another. In terms of flight time, this usually takes a little over 5h 09m.
When did momondo last update prices for flights from San Diego Airport to Helena Airport?
Prices for flights from San Diego Airport to Helena Airport are updated daily.
How many operators does momondo search for flights from San Diego Airport to Helena Airport?
As of October 2026, there is 1 operator available to choose from for flights from San Diego Airport to Helena Airport.
How old do you have to be to fly from San Diego Airport to Helena 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 San Diego Airport to Helena Airport.
What documentation or ID do you need to fly to Helena Airport?
The required travel and health documents for your Helena Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Helena Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from San Diego to Helena?
Based on momondo bookings for this flight route, the most popular airline on flight routes from San Diego to Helena is Delta (100% of total bookings).

Best airlines flying from San Diego to Helena

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

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $373	Free Cancellation	Rating 7.8 8,615 reviews		Search Delta flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from San Diego to Helena. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Helena from San Diego with this policy.

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

Once you have performed a search for San Diego to Helena flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

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