$161+ Cheap flights from Helena to San Diego (HLN - SAN)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Apr 15 — Apr 221
Round-trip
1 adult, Economy
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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
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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
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Best
Last-minute
One-way
Cheapest flights from Helena to San DiegoExplore 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 March 16, 2026.
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 March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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.
Sat 5/26:22 pm
HLN
- SAN
1 stop20h 05m
Alaska Airlines
Wed 5/67:15 am
SAN
- HLN
1 stop9h 30m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$234
This United Airlines deal was found by Cheapflights users on 3/11. 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 4/102:25 pm
HLN
- SAN
1 stop7h 57m
United Airlines
Fri 4/176:32 am
SAN
- HLN
1 stop6h 07m
United Airlines
Deal found 3/11![United Airlines logo]()
$321
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 4/106:22 pm
HLN
- SAN
2 stops16h 05m
Alaska Airlines
Fri 4/178:59 pm
SAN
- HLN
2 stops19h 46m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$365
Best flights from Helena to San DiegoDiscover carefully curated flight deals from Helena to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 16, 2026.
Discover carefully curated flight deals from Helena to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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.
Sat 5/26:22 pm
HLN
- SAN
1 stop20h 05m
Alaska Airlines
Wed 5/610:51 am
SAN
- HLN
1 stop5h 54m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$245
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/101:02 pm
HLN
- SAN
1 stop6h 33m
Delta
Fri 4/176:15 am
SAN
- HLN
1 stop5h 09m
Delta
Deal found 3/12![Delta logo]()
$390
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/231:04 pm
HLN
- SAN
1 stop6h 01m
Delta
Sun 4/266:15 am
SAN
- HLN
1 stop5h 09m
Delta
Deal found 3/12![Delta logo]()
$399
Last-minute flights from Helena to San DiegoDiscover last-minute flight deals from Helena to San Diego. Data last updated March 16, 2026 and is based on user searches.
Discover last-minute flight deals from Helena to San Diego. Data last updated March 16, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 3/256:22 pm
HLN
- SAN
2 stops14h 23m
Alaska Airlines
Mon 3/309:08 pm
SAN
- HLN
2 stops19h 37m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$506
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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.
Thu 3/266:22 pm
HLN
- SAN
2 stops25h 49m
Alaska Airlines
Mon 3/305:01 pm
SAN
- HLN
2 stops23h 44m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$495
This Delta deal was found by Cheapflights users on 3/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/261:02 pm
HLN
- SAN
1 stop6h 33m
Delta
Mon 3/306:15 am
SAN
- HLN
1 stop5h 06m
Delta
Deal found 3/11![Delta logo]()
$703
This United Airlines deal was found by Cheapflights users on 3/11. 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 4/102:25 pm
HLN
- SAN
1 stop7h 57m
United Airlines
Fri 4/176:32 am
SAN
- HLN
1 stop6h 07m
United Airlines
Deal found 3/11![United Airlines logo]()
$321
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 4/106:22 pm
HLN
- SAN
2 stops16h 05m
Alaska Airlines
Fri 4/178:59 pm
SAN
- HLN
2 stops19h 46m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$365
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/101:02 pm
HLN
- SAN
1 stop6h 33m
Delta
Fri 4/176:15 am
SAN
- HLN
1 stop5h 09m
Delta
Deal found 3/12![Delta logo]()
$390
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/231:04 pm
HLN
- SAN
1 stop6h 01m
Delta
Sun 4/266:15 am
SAN
- HLN
1 stop5h 09m
Delta
Deal found 3/12![Delta logo]()
$399
This Expedia deal was found by Cheapflights users on 3/12. 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.
Thu 4/236:22 pm
HLN
- SAN
2 stops15h 58m
Alaska Airlines
Sun 4/266:15 am
SAN
- HLN
1 stop10h 30m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$526
One-way flights from Helena to San DiegoSearch for one-way flight options from Helena to San Diego. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
Search for one-way flight options from Helena to San Diego. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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.
Sun 4/126:22 pm
HLN
- SAN
1 stop6h 37m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$161
This Delta deal was found by Cheapflights users on 3/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/45:45 am
HLN
- SAN
1 stop4h 14m
Delta
Deal found 3/14![Delta logo]()
$225
This Delta deal was found by Cheapflights users on 3/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/251:02 pm
HLN
- SAN
1 stop6h 33m
Delta
Deal found 3/11![Delta logo]()
$307
This Orbitz deal was found by Cheapflights users on 3/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:22 pm
HLN
- SAN
2 stops23h 39m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$318
This United Airlines deal was found by Cheapflights users on 3/11. 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 3/252:30 pm
HLN
- SAN
1 stop7h 33m
United Airlines
Deal found 3/11![United Airlines logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 3/14. 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.
Sat 7/45:26 pm
HLN
- SAN
2 stops26h 55m
Alaska Airlines
Deal found 3/14![Alaska Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 3/11. 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.
Thu 3/262:30 pm
HLN
- SAN
2 stops10h 44m
United Airlines
Deal found 3/11![United Airlines logo]()
$593
This United Airlines deal was found by Cheapflights users on 3/11. 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.
Sun 4/126:15 am
HLN
- SAN
3 stops15h 24m
United Airlines
Deal found 3/11![United Airlines logo]()
$1,111
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 March 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $234 (Alaska Airlines) |
One-way from | $161 (Alaska Airlines) |
Popular in | July |
Cheapest in | November |
Average price | $398 |
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 March 16, 2026.
Use the filters below to find and compare flights from Helena to San Diego that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Sat 5/2
6:22 pm-1:27 pm
1 stop20h 05m
San Diego
Wed 5/6
10:51 am-5:45 pm
1 stop5h 54m
$245
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Fri 4/10
1:02 pm-6:35 pm
1 stop6h 33m
San Diego
Fri 4/17
6:15 am-12:24 pm
1 stop5h 09m
$390
Quickest round-trip
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Thu 4/23
1:04 pm-6:05 pm
1 stop6h 01m
San Diego
Sun 4/26
6:15 am-12:24 pm
1 stop5h 09m
$399
Cheapest one-way
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Sun 4/12
6:22 pm-11:59 pm
1 stop6h 37m
$161
Quickest one-way
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Sat 7/4
5:45 am-8:59 am
1 stop4h 14m
$225
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Wed 3/25
1:02 pm-6:35 pm
1 stop6h 33m
$307
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Wed 3/25
6:22 pm-5:01 pm
2 stops23h 39m
$318
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Thu 3/26
6:15 am-12:57 pm
1 stop7h 42m
$342
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Sat 7/4
5:26 pm-7:29 pm
2 stops27h 03m
$374
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Sun 4/12
6:15 am-8:39 pm
3 stops15h 24m
$1,111
Sorted by cheapest first
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 March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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.
HLN-SAN
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
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 March 16, 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.
Comfort
7.9
Boarding
8.1
Crew
8.5
Entertainment
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Comfort
7.9
Boarding
8.1
Crew
8.5
Entertainment
7.8
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
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.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsEl Cajon
Chula Vista
National City
Coronado
La Mesa
Poway
Julian
Lemon Grove
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Helena and San Diego flights
Browse other Helena and San Diego flight options. Last updated on March 16, 2026.
Other flights from Helena
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Other flights to San Diego
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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 March 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$257 | Average$449 | FlexibilityNo cancel fee | On-timeN/A |