HLN - SAN

$139 Find Cheap Flights from Helena to San Diego

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Helena to San Diego departing on 3/7. 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 San Diego

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

Cheapest round-trip
$277
Alaska Airlines
Sat 3/14Tue 3/17
HLN - SAN • 1 stop
Cheapest one-way
$139
Alaska Airlines
Sat 3/7
HLN - SAN • 1 stop
Top airlines
Alaska Airlines
Cheapest • from $277 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to San Diego!
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Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Helena to San Diego 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 Helena to San Diego

Sat, Mar 14 - Tue, Mar 17
Alaska Airlines Logo
4:36 pm - 11:44 pm
HLN
-
SAN
8h 08m
1 stop
Alaska Airlines Logo
6:15 am - 3:59 pm
SAN
-
HLN
8h 44m
1 stop
$277Alaska Airlines
Fri, Mar 13 - Tue, Mar 17
Alaska Airlines Logo
4:36 pm - 11:03 pm
HLN
-
SAN
7h 27m
1 stop
Alaska Airlines Logo
6:15 am - 3:59 pm
SAN
-
HLN
8h 44m
1 stop
$299Alaska Airlines
Sat, Mar 14 - Tue, Mar 17
Alaska Airlines Logo
4:36 pm - 11:44 pm
HLN
-
SAN
8h 08m
1 stop
Alaska Airlines Logo
5:10 pm - 5:45 pm
SAN
-
HLN
23h 35m
2 stops
$302Alaska Airlines
Wed, Feb 25 - Wed, Mar 4
Alaska Airlines Logo
4:36 pm - 7:50 am
HLN
-
SAN
16h 14m
2 stops
Alaska Airlines Logo
8:26 pm - 3:59 pm
SAN
-
HLN
18h 33m
1 stop
$306Alaska Airlines
Mon, Mar 16 - Wed, Mar 18
Alaska Airlines Logo
4:36 pm - 12:24 pm
HLN
-
SAN
20h 48m
2 stops
Alaska Airlines Logo
10:48 am - 5:45 pm
SAN
-
HLN
5h 57m
1 stop
$317Alaska Airlines
Fri, Mar 13 - Fri, Mar 20
Alaska Airlines Logo
4:36 pm - 11:03 pm
HLN
-
SAN
7h 27m
1 stop
Alaska Airlines Logo
7:35 pm - 5:45 pm
SAN
-
HLN
21h 10m
1 stop
$321Alaska Airlines
Sat, Mar 14 - Mon, Mar 16
Alaska Airlines Logo
4:36 pm - 11:44 pm
HLN
-
SAN
8h 08m
1 stop
Alaska Airlines Logo
6:42 pm - 3:59 pm
SAN
-
HLN
20h 17m
2 stops
$322Alaska Airlines
Sat, Mar 14 - Mon, Mar 16
Alaska Airlines Logo
4:36 pm - 9:49 pm
HLN
-
SAN
6h 13m
1 stop
Alaska Airlines Logo
7:26 pm - 3:59 pm
SAN
-
HLN
19h 33m
1 stop
$323Alaska Airlines
Fri, Mar 13 - Tue, Mar 17
Alaska Airlines Logo
4:36 pm - 11:03 pm
HLN
-
SAN
7h 27m
1 stop
Alaska Airlines Logo
10:09 pm - 5:45 pm
SAN
-
HLN
18h 36m
2 stops
$324Alaska Airlines
Tue, Mar 17 - Sat, Mar 21
Delta Logo
5:30 am - 8:45 am
HLN
-
SAN
4h 15m
1 stop
Delta Logo
6:15 am - 12:21 pm
SAN
-
HLN
5h 06m
1 stop
$325Delta
Booking Insights

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

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

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

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 Helena to San Diego were found on Alaska Airlines ($277) and Delta ($325).

Good to know

Low seasonNovember
Cheapest flight$139
Best time to beat the crowds with an average 53% drop in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Helena to San Diego

When to book flights from Helena to San Diego

Are your dates flexible? Find out the best times to travel from Helena to San Diego 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 Helena to San Diego

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

    In the last 3 days, the lowest price for a flight from Helena to San Diego was $139 for a one-way ticket and $277 for a round-trip.

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

    No, a passport isn't needed to fly from Helena to San Diego. However, local authorities might ask for an official ID.

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

    Helena and San Diego are both served by 1 main airport. You will leave Helena from Helena and will be arriving at San Diego.

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

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

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

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

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

    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 Helena to San Diego.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from Helena 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 Helena to San Diego?

    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 San Diego with an airline and back to Helena with another airline. Booking your flights between Helena and SAN 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 Helena to San Diego?

    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 San Diego from Helena 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 Helena to San Diego

 
See real verified KAYAK customer reviews for airlines flying from Helena to San Diego. 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 Helena to San Diego? 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 8177 reviews
7.2Food
8.1Boarding
8.5Crew
7.9Comfort
7.8Entertainment
Airline reviews

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

10.0 ExcellentSarah, Feb 2026
SFO - LAX
Read more Delta reviews

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

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

The crew took good care of us. The flight from ATL to SFO is a longer one, and there were multiple beverage offerings. I like the 757's that Delta uses. Good airplane that is comfortable. I do wish Delta would separate Priority boarding from the better seats. I would gladly take a smaller seat in an open row than be jammed into Comfort just to get priority boarding, just to make sure I don't have to check a bag.

Gate agent rushed to fill hot jetway with crowd so it took over 12 minutes to go from gate to plane. Just like a discount airline Pooly prepared cabin and third time that claim of rough air prevented any cabin service. Friends on a Southwest flight at similar time had service.

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

Information on your arrival and departure airports