$243+ 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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — SAN
Sep 13 — Sep 201
Round-trip
1 adult, Economy
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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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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 August 14, 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 August 14, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Sat 11/74:41 pm -
1 stop6h 54m
Wed 11/113:48 pm -
2 stops23h 16m
Deal found 8/13![Alaska Airlines logo]()
$408
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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 11/134:41 pm -
1 stop24h 09m
Tue 11/171:48 pm -
1 stop25h 16m
Deal found 8/13![Alaska Airlines logo]()
$413
This Expedia deal was found by Cheapflights users on 8/10. 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.
Sat 10/245:26 pm -
1 stop7h 00m
Sun 11/16:29 pm -
2 stops20h 35m
Deal found 8/10![Alaska Airlines logo]()
$434
This Orbitz deal was found by Cheapflights users on 8/9. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:26 pm -
1 stop5h 32m
Wed 10/142:59 pm -
1 stop24h 50m
Deal found 8/9![Alaska Airlines logo]()
$444
This Alaska Airlines deal was found by Cheapflights users on 8/10. 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.
Thu 9/105:18 pm -
1 stop27h 36m
Thu 9/176:15 am -
1 stop9h 26m
Deal found 8/10![Alaska Airlines logo]()
$458
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Sun 11/154:41 pm -
1 stop18h 32m
Sun 11/226:15 am -
1 stop9h 17m
Deal found 8/13![Alaska Airlines logo]()
$468
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 August 14, 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 August 14, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/10. 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.
Fri 11/134:41 pm -
1 stop24h 09m
Tue 11/171:48 pm -
1 stop25h 16m
Deal found 8/10![Alaska Airlines logo]()
$413
This Delta deal was found by Cheapflights users on 8/12. 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.
Wed 12/305:45 am -
1 stop5h 48m
Sun 1/36:15 am -
1 stop5h 09m
Deal found 8/12![Delta logo]()
$505
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Sun 11/154:41 pm -
1 stop18h 32m
Sun 11/226:15 am -
1 stop9h 17m
Deal found 8/13![Alaska Airlines logo]()
$468
This Delta deal was found by Cheapflights users on 8/9. 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.
Sat 10/101:08 pm -
2 stops10h 35m
Wed 10/143:00 pm -
2 stops6h 24m
Deal found 8/9![Delta logo]()
$515
This Alaska Airlines deal was found by Cheapflights users on 8/10. 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.
Sun 11/14:41 pm -
2 stops20h 59m
Tue 11/35:10 pm -
2 stops21h 54m
Deal found 8/10![Alaska Airlines logo]()
$472
This Delta deal was found by Cheapflights users on 8/12. 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 9/117:15 am -
2 stops8h 46m
Sun 9/136:15 am -
1 stop5h 02m
Deal found 8/12![Delta logo]()
$530
Last-minute flights from Helena to San DiegoDiscover last-minute flight deals from Helena to San Diego. Data last updated August 14, 2026 and is based on user searches.
Discover last-minute flight deals from Helena to San Diego. Data last updated August 14, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/11. 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.
Sat 9/512:55 pm -
2 stops8h 53m
Thu 9/106:15 am -
1 stop5h 02m
Deal found 8/11![Delta logo]()
$539
This Alaska Airlines deal was found by Cheapflights users on 8/10. 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.
Thu 9/105:18 pm -
1 stop27h 36m
Thu 9/176:15 am -
1 stop9h 26m
Deal found 8/10![Alaska Airlines logo]()
$458
This Delta deal was found by Cheapflights users on 8/12. 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 9/117:15 am -
2 stops8h 46m
Sun 9/136:15 am -
1 stop5h 02m
Deal found 8/12![Delta logo]()
$530
This United Airlines deal was found by Cheapflights users on 8/11. 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 9/112:26 pm -
1 stop7h 08m
Sun 9/136:30 am -
1 stop6h 15m
Deal found 8/11![United Airlines logo]()
$605
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Sat 9/125:18 pm -
1 stop7h 26m
Sun 9/204:50 pm -
1 stop22h 51m
Deal found 8/13![Alaska Airlines logo]()
$595
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 August 14, 2026.
Search for one-way flight options from Helena to San Diego. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.
This Delta deal was found by Cheapflights users on 8/11. 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 12/235:45 am -
1 stop4h 21m
Deal found 8/11![Delta logo]()
$243
This Delta deal was found by Cheapflights users on 8/11. 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 12/241:09 pm -
1 stop6h 37m
Deal found 8/11![Delta logo]()
$263
This Delta deal was found by Cheapflights users on 8/11. 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.
Tue 12/225:45 am -
1 stop4h 21m
Deal found 8/11![Delta logo]()
$290
This Delta deal was found by Cheapflights users on 8/11. 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.
Mon 12/285:45 am -
2 stops10h 35m
Deal found 8/11![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 8/11. 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 12/252:30 pm -
2 stops10h 59m
Deal found 8/11![United Airlines logo]()
$308
This Alaska Airlines deal was found by Cheapflights users on 8/11. 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.
Wed 12/234:18 pm -
2 stops18h 32m
Deal found 8/11![Alaska Airlines logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 8/11. 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 12/224:18 pm -
2 stops23h 23m
Deal found 8/11![Alaska Airlines logo]()
$388
This Delta deal was found by Cheapflights users on 8/11. 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.
Sat 12/261:09 pm -
1 stop6h 37m
Deal found 8/11![Delta logo]()
$400
This Alaska Airlines deal was found by Cheapflights users on 8/11. 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 12/264:18 pm -
2 stops8h 41m
Deal found 8/11![Alaska Airlines logo]()
$482
This United Airlines deal was found by Cheapflights users on 8/11. 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 12/277:00 am -
1 stop27h 14m
Deal found 8/11![United Airlines logo]()
$527
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 August 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $408 (Alaska Airlines) |
One-way from | $243 (Delta) |
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 August 14, 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 Helena - SAN San Diego
HLNSAN
Helena
Fri 11/13
4:41 pm-3:50 pm
1 stop24h 09m
San Diego
Tue 11/17
1:48 pm-4:04 pm
1 stop25h 16m
$413
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Sun 11/15
4:41 pm-10:13 am
1 stop18h 32m
San Diego
Sun 11/22
6:15 am-4:32 pm
1 stop9h 17m
$468
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Sun 11/1
4:41 pm-12:40 pm
2 stops20h 59m
San Diego
Tue 11/3
5:10 pm-4:04 pm
2 stops21h 54m
$472
Quickest round-trip
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Wed 12/30
5:45 am-10:33 am
1 stop5h 48m
San Diego
Sun 1/3
6:15 am-12:24 pm
1 stop5h 09m
$505
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Sat 10/10
1:08 pm-10:43 pm
2 stops10h 35m
San Diego
Wed 10/14
3:00 pm-10:24 pm
2 stops6h 24m
$515
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Fri 9/11
7:15 am-3:01 pm
2 stops8h 46m
San Diego
Sun 9/13
6:15 am-12:17 pm
1 stop5h 02m
$530
Cheapest one-way
Quickest one-way
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Tue 12/22
5:45 am-9:06 am
1 stop4h 21m
$290
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Fri 12/25
5:45 am-9:06 am
1 stop4h 21m
$290
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Wed 12/23
4:18 pm-9:50 am
2 stops18h 32m
$337
HelenaSan Diego
HLN Helena - SAN San Diego
HLNSAN
Helena
Sat 12/26
4:18 pm-11:59 pm
2 stops8h 41m
$482
Showing 1-10 of 12 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 August.
| 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 August 14, 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.
Crew
8.5
Food
7.2
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Crew
8.5
Food
7.2
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Overall
7.8
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
National City
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Coronado
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La Mesa
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Lemon Grove
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Helena and San Diego flights
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Other flights from Helena
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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 August 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$306 | Average$417 | FlexibilityNo cancel fee | On-timeN/A |