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 38% 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 August 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.

$224 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

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:40 am - 4:04 pmSAN San Diego-HLN Helena

7h 24m1 stop Seattle/Tacoma Intl

4:41 pm - 10:35 pmHLN Helena-SAN San Diego

6h 54m1 stop Seattle/Tacoma Intl

$363Alaska Airlines

Wed, Nov 4 - Sat, Nov 7

4:50 pm - 3:31 pmSAN San Diego-HLN Helena

21h 41m1 stop Seattle/Tacoma Intl

4:08 pm - 8:56 pmHLN Helena-SAN San Diego

5h 48m1 stop Seattle/Tacoma Intl

$363Alaska Airlines

Tue, Dec 8 - Sat, Dec 12

4:50 pm - 3:31 pmSAN San Diego-HLN Helena

21h 41m1 stop Seattle/Tacoma Intl

4:08 pm - 8:56 pmHLN Helena-SAN San Diego

5h 48m1 stop Seattle/Tacoma Intl

$403Alaska Airlines

Tue, Dec 8 - Sat, Dec 12

10:00 am - 3:31 pmSAN San Diego-HLN Helena

28h 31m2 stops Sacramento Intl Seattle/Tacoma Intl

4:08 pm - 8:56 pmHLN Helena-SAN San Diego

5h 48m1 stop Seattle/Tacoma Intl

$406Alaska Airlines

Tue, Dec 8 - Sat, Dec 12

3:00 pm - 4:04 pmSAN San Diego-HLN Helena

24h 04m2 stops Sacramento Intl Seattle/Tacoma Intl

4:41 pm - 10:35 pmHLN Helena-SAN San Diego

6h 54m1 stop Seattle/Tacoma Intl

$416Alaska Airlines

Wed, Nov 4 - Sat, Nov 7

10:00 am - 3:31 pmSAN San Diego-HLN Helena

28h 31m2 stops Sacramento Intl Seattle/Tacoma Intl

4:08 pm - 8:56 pmHLN Helena-SAN San Diego

5h 48m1 stop Seattle/Tacoma Intl

$426Alaska Airlines

Tue, Dec 8 - Sat, Dec 12

10:00 am - 3:31 pmSAN San Diego-HLN Helena

28h 31m2 stops Sacramento Intl Seattle/Tacoma Intl

4:08 pm - 8:56 pmHLN Helena-SAN San Diego

5h 48m1 stop Seattle/Tacoma Intl

$438Alaska Airlines

Tue, Dec 8 - Sat, Dec 12

5:01 pm - 10:24 pmSAN San Diego-HLN Helena

4h 23m1 stop Salt Lake City

7:15 am - 3:01 pmHLN Helena-SAN San Diego

8h 46m2 stops Salt Lake City Los Angeles

$560Delta

Tue, Sep 8 - Fri, Sep 11

5:01 pm - 10:30 pmSAN San Diego-HLN Helena

4h 29m1 stop Salt Lake City

5:40 am - 8:41 amHLN Helena-SAN San Diego

4h 01m1 stop Salt Lake City

$626Delta

Sat, Sep 5 - Mon, Sep 7

3:00 pm - 10:30 pmSAN San Diego-HLN Helena

6h 30m2 stops Los Angeles Salt Lake City

5:40 am - 8:41 amHLN Helena-SAN San Diego

4h 01m1 stop Salt Lake City

$631Delta

Sat, Sep 5 - Mon, Sep 7

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Alaska Airlines flights from San Diego to Helena

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

Alaska Airlines

Nov 4

SAN7:40 amSan Diego

7h 24m

1 stop

HLN4:04 pmHelena

Nov 7

HLN4:41 pmHelena

6h 54m

1 stop

SAN10:35 pmSan Diego

$363

Alaska Airlines

Dec 8

SAN4:50 pmSan Diego

21h 41m

1 stop

HLN3:31 pmHelena

Dec 12

HLN4:08 pmHelena

5h 48m

1 stop

SAN8:56 pmSan Diego

$403

Alaska Airlines

Dec 8

SAN10:00 amSan Diego

28h 31m

2 stops

HLN3:31 pmHelena

Dec 12

HLN4:08 pmHelena

5h 48m

1 stop

SAN8:56 pmSan Diego

$406

United Airlines flights from San Diego to Helena

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

United Airlines

Sep 8

SAN12:37 pmSan Diego

7h 53m

1 stop

HLN9:30 pmHelena

Sep 11

HLN6:15 amHelena

7h 46m

1 stop

SAN1:01 pmSan Diego

$555

United Airlines

Nov 4

SAN6:20 amSan Diego

14h 11m

2 stops

HLN9:31 pmHelena

Nov 7

HLN6:28 amHelena

13h 09m

2 stops

SAN6:37 pmSan Diego

$625

United Airlines

Aug 17

SAN6:30 amSan Diego

6h 15m

1 stop

HLN1:45 pmHelena

Aug 23

HLN6:15 amHelena

9h 35m

1 stop

SAN2:50 pmSan Diego

$1,025

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Wed 11/4

7:40 am-4:04 pm

1 stop7h 24m

Helena

Sat 11/7

4:41 pm-10:35 pm

1 stop6h 54m

$363

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 12/8

4:50 pm-3:31 pm

1 stop21h 41m

Helena

Sat 12/12

4:08 pm-8:56 pm

1 stop5h 48m

$363

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 12/8

4:50 pm-3:31 pm

1 stop21h 41m

Helena

Sat 12/12

4:08 pm-8:56 pm

1 stop5h 48m

$403

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 12/8

10:00 am-3:31 pm

2 stops28h 31m

Helena

Sat 12/12

4:08 pm-8:56 pm

1 stop5h 48m

$406

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Wed 11/4

3:00 pm-4:04 pm

2 stops24h 04m

Helena

Sat 11/7

4:41 pm-10:35 pm

1 stop6h 54m

$416

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 12/8

10:00 am-3:31 pm

2 stops28h 31m

Helena

Sat 12/12

4:08 pm-8:56 pm

1 stop5h 48m

$426

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 12/8

10:00 am-3:31 pm

2 stops28h 31m

Helena

Sat 12/12

4:08 pm-8:56 pm

1 stop5h 48m

$438

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Tue 9/8

5:01 pm-10:24 pm

1 stop4h 23m

Helena

Fri 9/11

7:15 am-3:01 pm

2 stops8h 46m

$560

Quickest round-trip

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Sat 9/5

5:01 pm-10:30 pm

1 stop4h 29m

Helena

Mon 9/7

5:40 am-8:41 am

1 stop4h 01m

$626

San DiegoHelena

SAN San Diego - HLN Helena

SANHLN

San Diego

Sat 9/5

3:00 pm-10:30 pm

2 stops6h 30m

Helena

Mon 9/7

5:40 am-8:41 am

1 stop4h 01m

$631

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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 6% 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 46m
Direct flights	None

The fastest flight from San Diego to Helena takes 4h 46m

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 46m.
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 August 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 $328	Free Cancellation	Rating 7.8 8,502 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.