$224+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Jun 12 — Jun 191
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
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
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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 May 13, 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 May 13, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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.
Tue 10/274:48 pm
HLN
- SAN
2 stops16h 24m
Alaska Airlines
Sat 10/319:08 am
SAN
- HLN
1 stop6h 03m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$437
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 9/115:18 pm
HLN
- SAN
1 stop7h 26m
Alaska Airlines
Sun 9/137:58 pm
SAN
- HLN
1 stop19h 43m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$459
This Delta deal was found by Cheapflights users on 5/11. 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 7/235:40 am
HLN
- SAN
2 stops10h 28m
Delta
Sun 7/266:15 am
SAN
- HLN
1 stop5h 00m
Delta
Deal found 5/11![Delta logo]()
$464
This Expedia deal was found by Cheapflights users on 5/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/294:43 pm
HLN
- SAN
2 stops15h 32m
Alaska Airlines
Mon 6/13:56 pm
SAN
- HLN
1 stop23h 10m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$477
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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 7/85:09 pm
HLN
- SAN
2 stops16h 41m
Alaska Airlines
Mon 7/136:18 am
SAN
- HLN
1 stop9h 14m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$484
This Delta deal was found by Cheapflights users on 5/12. 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.
Mon 7/2012:55 pm
HLN
- SAN
2 stops7h 22m
Delta
Fri 7/246:15 am
SAN
- HLN
1 stop5h 00m
Delta
Deal found 5/12![Delta logo]()
$492
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 May 13, 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 May 13, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Tue 8/185:09 pm
HLN
- SAN
2 stops20h 26m
Alaska Airlines
Sat 8/227:44 am
SAN
- HLN
2 stops8h 11m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$445
This Delta deal was found by Cheapflights users on 5/11. 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 7/235:40 am
HLN
- SAN
1 stop4h 01m
Delta
Sat 7/255:01 pm
SAN
- HLN
1 stop4h 38m
Delta
Deal found 5/11![Delta logo]()
$487
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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.
Tue 10/274:48 pm
HLN
- SAN
2 stops18h 11m
Alaska Airlines
Sat 10/315:00 pm
SAN
- HLN
2 stops22h 31m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$455
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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 9/115:18 pm
HLN
- SAN
1 stop7h 26m
Alaska Airlines
Sun 9/136:32 pm
SAN
- HLN
1 stop21h 09m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$459
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 7/85:09 pm
HLN
- SAN
1 stop7h 47m
Alaska Airlines
Mon 7/136:18 am
SAN
- HLN
1 stop9h 14m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$459
Last-minute flights from Helena to San DiegoDiscover last-minute flight deals from Helena to San Diego. Data last updated May 13, 2026 and is based on user searches.
Discover last-minute flight deals from Helena to San Diego. Data last updated May 13, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 5/11. 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 5/222:20 pm
HLN
- SAN
1 stop7h 26m
United Airlines
Mon 5/256:35 am
SAN
- HLN
1 stop5h 58m
United Airlines
Deal found 5/11![United Airlines logo]()
$823
This Delta deal was found by Cheapflights users on 5/9. 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.
Sun 5/245:45 am
HLN
- SAN
1 stop7h 19m
Delta
Thu 5/285:01 pm
SAN
- HLN
1 stop4h 32m
Delta
Deal found 5/9![Delta logo]()
$633
This United Airlines deal was found by Cheapflights users on 5/9. 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 5/246:15 am
HLN
- SAN
2 stops13h 24m
United Airlines
Thu 5/286:35 am
SAN
- HLN
1 stop5h 58m
United Airlines
Deal found 5/9![United Airlines logo]()
$638
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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 5/244:43 pm
HLN
- SAN
2 stops20h 25m
Alaska Airlines
Thu 5/282:14 pm
SAN
- HLN
2 stops24h 52m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$867
This Expedia deal was found by Cheapflights users on 5/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/294:43 pm
HLN
- SAN
2 stops15h 32m
Alaska Airlines
Mon 6/13:56 pm
SAN
- HLN
1 stop23h 10m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$477
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 May 13, 2026.
Search for one-way flight options from Helena to San Diego. Find affordable one-way fares based on user searches. Data last updated May 13, 2026.
This Expedia deal was found by Cheapflights users on 5/10. 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.
Tue 7/215:09 pm
HLN
- SAN
2 stops15h 55m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$224
This Delta deal was found by Cheapflights users on 5/12. 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.
Sun 6/215:35 am
HLN
- SAN
1 stop4h 07m
Delta
Deal found 5/12![Delta logo]()
$230
This Delta deal was found by Cheapflights users on 5/13. 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.
Mon 8/312:55 pm
HLN
- SAN
1 stop6h 11m
Delta
Deal found 5/13![Delta logo]()
$258
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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 5/234:43 pm
HLN
- SAN
2 stops29h 31m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$289
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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.
Mon 7/205:09 pm
HLN
- SAN
2 stops18h 36m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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.
Mon 8/35:09 pm
HLN
- SAN
2 stops16h 56m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 5/9. 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.
Sat 5/236:15 am
HLN
- SAN
1 stop7h 26m
United Airlines
Deal found 5/9![United Airlines logo]()
$317
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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 7/225:09 pm
HLN
- SAN
2 stops29h 13m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$329
This Expedia deal was found by Cheapflights users on 5/12. 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.
Sun 5/244:43 pm
HLN
- SAN
2 stops17h 04m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$396
This Delta deal was found by Cheapflights users on 5/9. 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 7/2212:55 pm
HLN
- SAN
1 stop6h 11m
Delta
Deal found 5/9![Delta logo]()
$398
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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 5/224:43 pm
HLN
- SAN
2 stops29h 31m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$411
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 May 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $437 (Alaska Airlines) |
One-way from | $224 (Expedia) |
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 May 13, 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
Tue 8/18
5:09 pm-12:35 pm
2 stops20h 26m
San Diego
Sat 8/22
7:44 am-4:55 pm
2 stops8h 11m
$445
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Tue 10/27
4:48 pm-9:59 am
2 stops18h 11m
San Diego
Sat 10/31
5:00 pm-4:31 pm
2 stops22h 31m
$455
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Fri 9/11
5:18 pm-11:44 pm
1 stop7h 26m
San Diego
Sun 9/13
6:32 pm-4:41 pm
1 stop21h 09m
$459
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Wed 7/8
5:09 pm-11:56 pm
1 stop7h 47m
San Diego
Mon 7/13
6:18 am-4:32 pm
1 stop9h 14m
$459
Quickest round-trip
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Thu 7/23
5:40 am-8:41 am
1 stop4h 01m
San Diego
Sat 7/25
5:01 pm-10:39 pm
1 stop4h 38m
$487
Cheapest one-way
Quickest one-way
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Tue 7/21
12:55 pm-3:56 pm
1 stop4h 01m
$230
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Mon 7/20
5:40 am-8:41 am
1 stop4h 01m
$230
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Sat 5/23
4:43 pm-8:47 am
2 stops17h 04m
$289
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Mon 7/20
5:09 pm-10:45 am
2 stops18h 36m
$307
HelenaSan Diego
HLN - SAN
HLNSAN
Helena
Mon 8/3
5:09 pm-9:05 am
2 stops16h 56m
$309
Showing 1-10 of 14 resultsSorted 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 May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | 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.
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 May 13, 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.
Overall
7.9
Comfort
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Overall
7.9
Comfort
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Boarding
8.1
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
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Helena and San Diego flights
Browse other Helena and San Diego flight options. Last updated on May 13, 2026.
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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 May 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$306 | Average$449 | FlexibilityNo cancel fee | On-timeN/A |