HLN to SFO, Helena Regional Airport to San Francisco International Airport Cheap Flights

Based on HopeGoo data, Alaska Airlines offers one-way fares as low as US$438 on Cheapest nonstop routes (e.g. HLN to SFO on Sun, Mar 1), while Delta Air Lines offers Cheapest nonstop round-trips from US$326 departing on Tue, Mar 24 and returning on Fri, Mar 27.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Helena to San Francisco is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Helena to San Francisco, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sun, Mar 1, with one-way flights priced at just US$438. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for San Francisco travel is around July. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Helena to San Francisco is November, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Helena to San Francisco on February 27, 2026 with Delta Air Lines, with prices starting at US$588.

The time difference between San Francisco and Helena is 1h.

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