Cheapest 100LL Avgas in Idaho
12 FBOs with 100LL pricing · Updated daily
The average 100LL price in Idaho is $7.97/gal. Below are all FBOs ranked from cheapest to most expensive.
Prices updated daily · Last updated July 29, 2026
| # | FBO | Airport | Jet-A | 100LL |
|---|---|---|---|---|
| 1 | Gem Air LLCBest Price | KSMN | $6.46 | $6.84 |
| 2 | Salmon Air | KSMN | $6.63 | $6.90 |
| 3 | Pocatello Avcenter | KPIH | $7.90 | $7.40 |
| 4 | Aero Mark | KIDA | $7.20 | $7.45 |
| 5 | Jackson Jet Center | KTWF | $7.89 | $7.99 |
| 6 | Stancraft Jet Center | KCOE | $8.82 | $8.05 |
| 7 | Hillcrest Aircraft | KLWS | $6.99 | $8.10 |
| 8 | Atlantic Aviation | KSUN | $11.03 | $8.21 |
| 9 | McCall Aviation | KMYL | $8.49 | $8.28 |
| 10 | Western Aircraft | KBOI | $7.99 | $8.43 |
| 11 | Jackson Jet Center | KBOI | $7.99 | $8.99 |
| 12 | Turbo Air | KBOI | $8.01 | $8.99 |
100LL Avgas Market Analysis in Idaho
We track 100LL avgas at 12 FBOs across 9 airports in Idaho. The cheapest 100LL is $6.84/gal at Gem Air LLC (KSMN), and the highest is $8.99/gal — a $2.15/gal difference depending on where you stop. 4 FBOs are below the $7.97/gal state average. For a typical 50-gallon piston top-off, the cheapest stop saves roughly $56 versus the average.
100LL is the standard fuel for most piston-engine aircraft. Because avgas volumes are smaller than Jet-A, prices are especially sensitive to local supplier logistics and airport traffic. Self-serve pumps usually undercut full-service by a wide margin and are often available 24/7. Figures update daily from AirNav reports.