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

Alaska Airlines and Delta 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 35% of people opting to fly with this airline when traveling to Helena. Keep in mind that there are 7 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 June 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.

$240 Cheap Flights from San Diego to Helena in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Diego to Helena

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:15 am - 4:04 pm

SAN

HLN

8h 49m

1 stop

4:41 pm - 3:50 pm

HLN

SAN

24h 09m

1 stop

$333Alaska Airlines

Sat, Nov 7 - Tue, Nov 10

7:38 pm - 4:04 pm

SAN

HLN

19h 26m

1 stop

4:41 pm - 10:31 pm

HLN

SAN

6h 50m

1 stop

$368Alaska Airlines

Wed, Nov 11 - Sat, Nov 14

6:15 am - 4:04 pm

SAN

HLN

8h 49m

1 stop

4:41 pm - 3:17 pm

HLN

SAN

23h 36m

2 stops

$371Alaska Airlines

Sat, Nov 7 - Tue, Nov 10

10:51 am - 4:04 pm

SAN

HLN

28h 13m

2 stops

4:41 pm - 10:31 pm

HLN

SAN

6h 50m

1 stop

$381Alaska Airlines

Wed, Nov 11 - Sat, Nov 14

6:15 am - 4:04 pm

SAN

HLN

8h 49m

1 stop

4:41 pm - 10:31 pm

HLN

SAN

6h 50m

1 stop

$383Alaska Airlines

Wed, Nov 11 - Sat, Nov 14

8:06 am - 4:04 pm

SAN

HLN

30h 58m

2 stops

4:41 pm - 10:31 pm

HLN

SAN

6h 50m

1 stop

$390Alaska Airlines

Wed, Nov 11 - Sat, Nov 14

6:18 am - 4:32 pm

SAN

HLN

9h 14m

1 stop

5:32 pm - 11:44 pm

HLN

SAN

7h 12m

1 stop

$403Alaska Airlines

Tue, Aug 11 - Sat, Aug 22

7:48 am - 4:32 pm

SAN

HLN

7h 44m

2 stops

5:32 pm - 11:44 pm

HLN

SAN

7h 12m

1 stop

$430Alaska Airlines

Tue, Aug 11 - Sat, Aug 22

6:35 pm - 4:41 pm

SAN

HLN

21h 06m

1 stop

5:18 pm - 2:42 pm

HLN

SAN

22h 24m

1 stop

$443Alaska Airlines

Fri, Sep 11 - Mon, Sep 14

5:01 pm - 10:24 pm

SAN

HLN

4h 23m

1 stop

7:15 am - 12:30 pm

HLN

SAN

6h 15m

1 stop

$451Delta

Thu, Sep 10 - Sun, Sep 13

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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

Jul 10

SAN6:35 amSan Diego

5h 58m

1 stop

HLN1:33 pmHelena

Jul 13

HLN6:15 amHelena

9h 40m

1 stop

SAN2:55 pmSan Diego

$795

United Airlines

Jul 9

SAN6:35 amSan Diego

5h 58m

1 stop

HLN1:33 pmHelena

Jul 13

HLN6:15 amHelena

13h 24m

2 stops

SAN6:39 pmSan Diego

$856

United Airlines

Jul 3

SAN12:33 pmSan Diego

7h 47m

1 stop

HLN9:20 pmHelena

Jul 8

HLN6:15 amHelena

12h 05m

1 stop

SAN5:20 pmSan Diego

$930

Delta flights from San Diego to Helena

Our best Delta deals on San Diego to Helena flight tickets

Delta

Sep 10

SAN5:01 pmSan Diego

4h 23m

1 stop

HLN10:24 pmHelena

Sep 13

HLN7:15 amHelena

6h 15m

1 stop

SAN12:30 pmSan Diego

$451

Delta

Aug 11

SAN3:00 pmSan Diego

6h 30m

2 stops

HLN10:30 pmHelena

Aug 22

HLN12:55 pmHelena

8h 53m

2 stops

SAN8:48 pmSan Diego

$454

Delta

Sep 10

SAN3:00 pmSan Diego

6h 24m

2 stops

HLN10:24 pmHelena

Sep 13

HLN7:15 amHelena

6h 15m

1 stop

SAN12:30 pmSan Diego

$456

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Sat 11/7

6:15 am-4:04 pm

1 stop8h 49m

Helena

Tue 11/10

4:41 pm-3:50 pm

1 stop24h 09m

$333

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Wed 11/11

7:38 pm-4:04 pm

1 stop19h 26m

Helena

Sat 11/14

4:41 pm-10:31 pm

1 stop6h 50m

$368

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Sat 11/7

6:15 am-4:04 pm

1 stop8h 49m

Helena

Tue 11/10

4:41 pm-3:17 pm

2 stops23h 36m

$371

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Wed 11/11

10:51 am-4:04 pm

2 stops28h 13m

Helena

Sat 11/14

4:41 pm-10:31 pm

1 stop6h 50m

$381

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Wed 11/11

6:15 am-4:04 pm

1 stop8h 49m

Helena

Sat 11/14

4:41 pm-10:31 pm

1 stop6h 50m

$383

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Wed 11/11

8:06 am-4:04 pm

2 stops30h 58m

Helena

Sat 11/14

4:41 pm-10:31 pm

1 stop6h 50m

$390

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Tue 8/11

6:18 am-4:32 pm

1 stop9h 14m

Helena

Sat 8/22

5:32 pm-11:44 pm

1 stop7h 12m

$403

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Tue 8/11

7:48 am-4:32 pm

2 stops7h 44m

Helena

Sat 8/22

5:32 pm-11:44 pm

1 stop7h 12m

$430

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Fri 9/11

6:35 pm-4:41 pm

1 stop21h 06m

Helena

Mon 9/14

5:18 pm-2:42 pm

1 stop22h 24m

$443

Quickest round-trip

San DiegoHelena

SAN - HLN

SANHLN

San Diego

Thu 9/10

5:01 pm-10:24 pm

1 stop4h 23m

Helena

Sun 9/13

7:15 am-12:30 pm

1 stop6h 15m

$451

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted 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 22% 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

Fastest flight time	4h 23m
Direct flights	None

The fastest flight from San Diego to Helena takes 4h 23m

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 4h 23m.
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 June 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 $278	Free Cancellation	Rating 7.8 8,453 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.