Allegiant AirDepart08:52
Fri, Nov 13IDA → FSD
4h 42m · 1 stop
$320one way, per person
View deal
- Cheapest fare
- $320
- Cheapest month
- November
- Direct flights
- Not recently
- Quickest trip
- 4h 42m
Allegiant Air · Fri, Nov 13
from $320
Usually 1+ stop
1,230 km
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Cheapest month to fly from Idaho Falls to Sioux Falls
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in November 2026
The lowest fares we've seen for each day, cheapest first.
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About flights from Idaho Falls to Sioux Falls
Idaho Falls (IDA) and Sioux Falls (FSD) are about 1,230 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 4h 42m. Over the next few months, one-way fares start from $320, and November 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from Idaho Falls to Sioux Falls?
The cheapest one-way fare we've seen recently is $320 with Allegiant Air, departing Friday, November 13, 2026.
What is the cheapest month to fly from Idaho Falls to Sioux Falls?
November 2026 currently has the lowest fares, from $320 one way.
Are there direct flights from Idaho Falls to Sioux Falls?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from Idaho Falls to Sioux Falls?
The quickest journey we've seen takes about 4h 42m. Idaho Falls and Sioux Falls are around 1,230 km apart.
Which airlines fly from Idaho Falls to Sioux Falls?
Recent fares on this route were with Allegiant Air.
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