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Find cheap one-way flights from Helena to San Diego starting at US$120.

For as little as US$120, you can take your next adventure to San Diego without breaking the bank. Choose between one-way and return tickets from Helena below.

  • One way
  • Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Helena to San Diego Flight time & Schedules

Flight info.
Departure
Arrival
Weekly Schedule
  1. DL3901

    05:45

    HLN

    1.5h

    07:13

    SLC

    SMTWTFS
  2. DL1179

    11:25

    SLC

    2.1h

    12:29

    SAN

    SMTWTFS
  3. DL3901

    05:45

    HLN

    1.5h

    07:13

    SLC

    SMTWTFS
  4. DL1177

    08:00

    SLC

    2.2h

    09:10

    SAN

    SMTWTFS
  5. UA5514

    06:45

    HLN

    2.1h

    08:51

    DEN

    SMTWTFS
  6. UA1234

    09:50

    DEN

    2.1h

    10:59

    LAS

    SMTWT-S
  7. AS3370

    17:55

    LAS

    1.2h

    19:09

    SAN

    --T----
  8. UA5514

    06:45

    HLN

    2.1h

    08:51

    DEN

    SMTWTFS
  9. UA366

    11:34

    DEN

    2.6h

    13:11

    SAN

    SMTWTFS
  10. DL3880

    13:00

    HLN

    1.5h

    14:30

    SLC

    SMTWTFS
  11. DL1252

    17:50

    SLC

    1.9h

    18:45

    SAN

    SMTWT-S
  12. UA5911

    14:39

    HLN

    2.0h

    16:40

    DEN

    SMTWTFS
  13. F94989

    18:20

    DEN

    2.5h

    19:49

    SAN

    SMTWTFS
  14. UA5911

    14:39

    HLN

    2.0h

    16:40

    DEN

    SMTWTFS
  15. UA540

    19:50

    DEN

    2.4h

    21:14

    SAN

    SMTWTFS
  16. AS2222

    16:11

    HLN

    1.8h

    16:56

    SEA

    SMTWTFS
  17. AS1131

    19:50

    SEA

    2.8h

    22:37

    SAN

    SMTWTFS
  18. AS2222

    16:11

    HLN

    1.8h

    16:56

    SEA

    SMTWTFS
  19. AS1098

    17:59

    SEA

    2.8h

    20:45

    SAN

    SMTWTFS
  20. AS2322

    17:00

    HLN

    1.7h

    17:41

    SEA

    ------S
  21. AS1131

    19:50

    SEA

    2.8h

    22:37

    SAN

    SMTWTFS

When is the cheapest time to book flights from Helena to San Diego?

Explore the best time to buy affordable tickets to San Diego with our price trend chart, which predicts how flight prices will change in the coming weeks from previous data.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

  • When are flight tickets from Helena (HLN) to San Diego (SAN) the cheapest?

    Airlines adjust prices for flights from Helena to San Diego based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
  • How much do flights from Helena (HLN) to San Diego (SAN) cost?

    According to Trip.com's data, the lowest price is around $384.
  • What is the transportation method from the main airport to downtown in San Diego?

    • The distance from San Diego International Airport to downtown is about 3 km. It takes about 20 minutes by taxi.

How to find a cheap flight from Helena to San Diego

If you don’t know some of the key things to look out for when buying flight tickets, prices can often end up sky high or, worse, sold out! We’ve carefully compiled our six most important steps to help ensure you’re getting the best deals when planning your next journey.
1
Being flexible with your dates to get the cheapest Helena to San Diego ticket.
Tap "Date" on flight search bar to scan through the calender for Helena to San Diego airfare over next 6 months in 2025. If you would like to fly in next 3 months, it seems the cheapest date is on Fri, Mar 7 at US$120 for one-way flights.
2
Compare cheap Helena to San Diego flight deals from over hundreds of airlines.
Our extensive search allows you to compare prices from over 500 airlines to choose the cheapest flight tickets from Helena to San Diego. The cheapest airline operating is Alaska Airlines.
3
Set up a Price Alert
By setting up a Price Alert for your Helena to San Diego route, you can easily track the price of your airline tickets from Helena to San Diego without manually checking every day.
4
Don't miss cheap Helena to San Diego flight deals and promo codes.
You can always get the latest deals through Trip.com Deals and Promo Codes for cheap flights for cheap flights. If registering a free membership, you can receive more deals for your flights.
5
Book early or wait unitl the last minute.
It's always better to book early. Flight tickets tend to be the cheapest when they are first released, normally about a year before the departure date. So, check online as soon as the flights you want become available. If you miss the cheapest time, you can still find lower-priced tickets as the flight date approaches.
6
Search for flights on the go.
To get the best flight booking experience on the go, download Trip.com free app and search for cheap flight tickets from Helena to San Diego to get exclusive deals for you.

Helena to San Diego Flight Information

Cheapest nonstop flight price$120
Off-season for travelFebruary
Peak season for travelDecember
Flight distance1,604.66 km
Popular airlineAlaska Airlines