PIR to SFO, Pierre Regional Airport to San Francisco International Airport Cheap Flights

Based on HopeGoo data, United Airlines offers one-way fares as low as US$340 on Cheapest nonstop routes (e.g. PIR to SFO on Sat, Apr 4), while United Airlines offers Cheapest nonstop round-trips from US$394 departing on Tue, Mar 10 and returning on Sat, Mar 14.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Pierre 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 Pierre 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 Sat, Apr 4, with one-way flights priced at just US$340. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is United 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 August. · Get exclusive promo codes for HopeGoo app users.

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

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Pierre to San Francisco on March 10, 2026 with United Airlines, with prices starting at US$394.

The time difference between San Francisco and Pierre is 2h.

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