HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$217+ Cheap flights from Helena to San Diego (HLN - SAN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Helena to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Helena to San Diego

Cheapest flights from Helena to San Diego
Explore the most affordable flight options available from Helena to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:25 pm
HLN
-
SAN
1 stop7h 26m
United Airlines
Wed 3/412:55 pm
SAN
-
HLN
1 stop7h 21m
United Airlines
Deal found 1/28$217
This Expedia deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:36 pm
HLN
-
SAN
1 stop7h 27m
Alaska Airlines
Wed 3/43:07 pm
SAN
-
HLN
2 stops23h 52m
Alaska Airlines
Deal found 1/28$255
This Alaska Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:36 pm
HLN
-
SAN
1 stop6h 13m
Alaska Airlines
Sat 2/286:15 am
SAN
-
HLN
1 stop8h 44m
Alaska Airlines
Deal found 1/28$271
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/182:25 pm
HLN
-
SAN
1 stop7h 26m
United Airlines
Sun 2/226:30 am
SAN
-
HLN
1 stop6h 10m
United Airlines
Deal found 1/28$290
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/272:25 pm
HLN
-
SAN
1 stop7h 26m
United Airlines
Fri 3/66:30 am
SAN
-
HLN
1 stop6h 08m
United Airlines
Deal found 1/28$325
This Alaska Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/134:36 pm
HLN
-
SAN
1 stop6h 13m
Alaska Airlines
Fri 3/208:43 pm
SAN
-
HLN
1 stop20h 02m
Alaska Airlines
Deal found 1/28$349

Find flight deals from Helena to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Helena (HLN) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$217
(United Airlines)

Popular in

July

Cheapest in

November

Average price

$597
Provider with most accurate pricing for Helena-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Helena-San Diego flights.
Search Deals
From Helena to San Diego
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($92 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Helena to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Helena to San Diego that are best for you.

Fly from

Helena

Fly to

San Diego

Route

Depart

Return

Price

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/25

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Wed 3/4

12:55 pm-9:16 pm

1 stop7h 21m

$217

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/25

4:36 pm-9:49 pm

1 stop6h 13m

San Diego

Sat 2/28

6:15 am-3:59 pm

1 stop8h 44m

$271

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Wed 2/18

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Sun 2/22

6:30 am-1:40 pm

1 stop6h 10m

$290

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 2/27

2:25 pm-8:51 pm

1 stop7h 26m

San Diego

Fri 3/6

6:30 am-1:38 pm

1 stop6h 08m

$325

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sat 5/30

4:43 pm-9:51 pm

1 stop6h 08m

San Diego

Fri 6/5

3:11 pm-4:06 pm

1 stop23h 55m

$349

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Fri 3/13

4:36 pm-9:49 pm

1 stop6h 13m

San Diego

Fri 3/20

8:43 pm-5:45 pm

1 stop20h 02m

$349

HelenaSan Diego

HLN - SAN

HLNSAN

Helena

Sun 3/15

4:36 pm-11:03 pm

1 stop7h 27m

$268

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Compare providers for flights from Helena to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Helena to San Diego in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Helena-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Helena-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Helena-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Helena-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Helena-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Helena to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Helena with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Helena to San Diego?

Currently, March is the cheapest month in which you can book a flight from Helena to San Diego (average of $118). Flying from Helena to San Diego in January is currently the most expensive (average of $176). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated January 29, 2026.
Get a feel of what it's like to fly with Delta from Helena to San Diego by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,128 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
7.9
Good
8,128 reviews
Delta
7.9
Good
8,128 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Helena to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Helena to San Diego?

    Airlines like United Airlines and Alaska Airlines fly from Helena to San Diego in about 6h 13m. The time it takes to get you to your destination can typically vary by up to 1h 13m. Airlines will cover a distance of 997 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Helena to San Diego round-trip?

    Our cheapest airline available from Helena to San Diego is Delta. Our recent data shows that you can find tickets from as low as $301 on this airline. Delta is currently priced 30% below the average price you’ll pay for this route.

  • Can I find deals for flights from Helena to San Diego that include hotel bookings?

    Yes. In addition to deals on Helena to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Helena to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Helena to San Diego.

  • Can I find deals for business class flights from Helena to San Diego?

    Yes. Cheapflights offers flight deals from Helena to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, March is the cheapest month in which you can book a flight from Helena to San Diego (average of $118). Flying from Helena to San Diego in January is currently the most expensive (average of $176). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
National City
Coronado
La Mesa
Poway
Julian
Lemon Grove

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Helena to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
Bozeman to Las Vegas flights
Bozeman to Los Angeles flights
Bozeman to San Francisco flights
Helena to Las Vegas flights
Billings to Las Vegas flights
Bozeman to San Diego flights
Kalispell to Los Angeles flights
Bozeman to Santa Ana flights
Billings to Los Angeles flights
Missoula to Los Angeles flights
Missoula to San Francisco flights
Missoula to Las Vegas flights
Missoula to San Diego flights
Bozeman to Ontario flights
Billings to Ontario flights
Bozeman to Palm Springs flights
Missoula to Sacramento flights
Kalispell to Las Vegas flights
Great Falls to Las Vegas flights
Kalispell to San Diego flights
Bozeman to San Jose flights
Billings to Palm Springs flights
Billings to San Francisco flights
Billings to San Diego flights
Kalispell to San Francisco flights
Billings to Santa Ana flights
Billings to Reno flights
Missoula to Santa Ana flights
Missoula to Oakland flights
Great Falls to San Diego flights
Bozeman to Burbank flights
Missoula to Ontario flights
Kalispell to Santa Ana flights
Kalispell to Ontario flights
Missoula to Burbank flights
Bozeman to Oakland flights
Billings to Sacramento flights
Great Falls to Los Angeles flights
Missoula to Reno flights
Bozeman to Sacramento flights
Billings to Burbank flights
Butte to Las Vegas flights
Missoula to San Jose flights
Missoula to Palm Springs flights
Bozeman to Santa Barbara flights
Kalispell to Palm Springs flights
Helena to Los Angeles flights
Great Falls to San Francisco flights
Kalispell to Reno flights

Top airline flying from Helena to San Diego

Discover the top airline that operate flights from Helena to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$301Average$391FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.