SAN - HLN

$139 Find Cheap Flights from San Diego to Helena

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Diego to Helena departing on 3/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Helena

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Diego to Helena, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Diego to Helena, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$355
Alaska Airlines
Mon 3/16Wed 3/18
SAN - HLN • 2 stops
Cheapest one-way
$139
United Airlines
Wed 3/18
SAN - HLN • 1 stop
Top airlines
Alaska Airlines
Cheapest • from $355 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between San Diego and Helena. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Salt Lake City (SLC)
Cheapest • Avg $357 (round-trip)
Salt Lake City (SLC)
Shortest trip • 4h 56m (one-way)
Insights
Insights
Insights
Insights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Helena!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from San Diego to Helena (SAN-HLN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Diego to Helena that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Diego to Helena

Mon, Mar 16 - Wed, Mar 18
Alaska Airlines Logo
8:59 pm - 3:59 pm
SAN
-
HLN
18h 00m
2 stops
Alaska Airlines Logo
6:22 pm - 8:55 am
HLN
-
SAN
15h 33m
2 stops
$355Alaska Airlines
Mon, Mar 16 - Wed, Mar 18
Delta Logo
6:15 am - 12:21 pm
SAN
-
HLN
5h 06m
1 stop
Delta Logo
5:30 am - 8:45 am
HLN
-
SAN
4h 15m
1 stop
$361Delta
Tue, Jul 7 - Sat, Jul 11
Alaska Airlines Logo
7:15 am - 4:49 pm
SAN
-
HLN
8h 34m
1 stop
Alaska Airlines Logo
5:26 pm - 10:33 pm
HLN
-
SAN
6h 07m
1 stop
$389Alaska Airlines
Tue, Jul 7 - Sat, Jul 11
Alaska Airlines Logo
7:48 am - 4:49 pm
SAN
-
HLN
8h 01m
2 stops
Alaska Airlines Logo
5:26 pm - 11:59 pm
HLN
-
SAN
7h 33m
1 stop
$407Alaska Airlines
Tue, Jun 23 - Sun, Jun 28
Alaska Airlines Logo
8:15 pm - 4:49 pm
SAN
-
HLN
19h 34m
2 stops
Alaska Airlines Logo
5:26 pm - 11:59 pm
HLN
-
SAN
7h 33m
1 stop
$410Alaska Airlines
Mon, Mar 16 - Wed, Mar 18
Alaska Airlines Logo
6:42 pm - 3:59 pm
SAN
-
HLN
20h 17m
2 stops
Alaska Airlines Logo
6:22 pm - 9:52 am
HLN
-
SAN
16h 30m
1 stop
$411Alaska Airlines
Tue, Jun 23 - Sun, Jun 28
Alaska Airlines Logo
8:35 pm - 4:49 pm
SAN
-
HLN
19h 14m
1 stop
Alaska Airlines Logo
5:26 pm - 11:59 pm
HLN
-
SAN
7h 33m
1 stop
$412Alaska Airlines
Tue, Jun 23 - Sun, Jun 28
Alaska Airlines Logo
6:49 pm - 4:49 pm
SAN
-
HLN
21h 00m
2 stops
Alaska Airlines Logo
5:26 pm - 11:59 pm
HLN
-
SAN
7h 33m
1 stop
$415Alaska Airlines
Fri, Jul 3 - Wed, Jul 8
Alaska Airlines Logo
8:01 pm - 4:49 pm
SAN
-
HLN
19h 48m
2 stops
Alaska Airlines Logo
5:26 pm - 9:15 am
HLN
-
SAN
16h 49m
2 stops
$416Alaska Airlines
Fri, Jul 3 - Wed, Jul 8
Alaska Airlines Logo
8:01 pm - 4:49 pm
SAN
-
HLN
19h 48m
2 stops
Alaska Airlines Logo
5:26 pm - 10:05 pm
HLN
-
SAN
5h 39m
1 stop
$417Alaska Airlines
Booking Insights

KAYAK's insights & trends for San Diego to Helena flights

Get data-powered insights and trends into flights from San Diego to Helena to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from San Diego to Helena?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from San Diego to Helena were found on Alaska Airlines ($355) and Delta ($361).

Good to know

Low seasonJuly
Cheapest flight$139
Best time to beat the crowds with an average 48% drop in price.
Most popular time to fly and prices are also 27% lower on average.
Flight from San Diego to Helena

When to book flights from San Diego to Helena

Are your dates flexible? Find out the best times to travel from San Diego to Helena based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from San Diego to Helena

  • What is the cheapest flight from San Diego to Helena?

    In the last 3 days, the lowest price for a flight from San Diego to Helena was $139 for a one-way ticket and $355 for a round-trip.

  • Do I need a passport to fly between San Diego and Helena?

    A passport is not required to fly from San Diego to Helena.

  • Which airports will I be using when flying from San Diego to Helena?

    When flying out of San Diego you will be using San Diego. You will be landing at Helena, also known as Helena.

  • Which aircraft models fly most regularly from San Diego to Helena?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from San Diego to Helena?

    SkyTeam is the only airline alliance operating flights between San Diego and Helena.

  • How does KAYAK find such low prices on flights from San Diego to Helena?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Diego to Helena.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Diego to Helena?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Helena from San Diego is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Diego to Helena?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Helena with an airline and back to San Diego with another airline. Booking your flights between San Diego and HLN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Diego to Helena?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Helena from San Diego up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from San Diego to Helena

 
See real verified KAYAK customer reviews for airlines flying from San Diego to Helena. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Diego to Helena? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8237 reviews
8.1Boarding
8.5Crew
7.9Comfort
7.8Entertainment
7.2Food
Airline reviews

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

4.0 OkayJahmes, Feb 2026
LAX - MCO
Read more Delta reviews

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

The plane was an older model, so it wasn’t as comfortable as others. The flight attendants were not helpful during onboarding. It was a full flight so there was chaos finding space for baggage.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Everything you need to know for your flight from San Diego to Helena

Information on your arrival and departure airports