Cheapest 100LL Avgas in Illinois
19 FBOs with 100LL pricing · Updated daily
The average 100LL price in Illinois is $7.98/gal. Below are all FBOs ranked from cheapest to most expensive.
Prices updated daily · Last updated June 14, 2026
| # | FBO | Airport | Jet-A | 100LL |
|---|---|---|---|---|
| 1 | Quincy AviationBest Price | KUIN | $6.95 | $6.25 |
| 2 | Kankakee Valley Airport Authority | KIKK | $7.61 | $6.88 |
| 3 | Gaitros Aviation | KDEC | $8.39 | $6.93 |
| 4 | Midwest Aviation | KMWA | $7.08 | $6.95 |
| 5 | Synergy Flight Center | KBMI | $7.50 | $7.04 |
| 6 | Emery Air | KRFD | $7.33 | $7.19 |
| 7 | Flightline | KMDH | $6.50 | $7.26 |
| 8 | Flightstar | KCMI | $7.45 | $7.64 |
| 9 | Byerly Aviation | KPIA | $7.43 | $8.08 |
| 10 | Stellar Aviation of Springfield | KSPI | $7.74 | $8.13 |
| 11 | West Star Aviation, Inc. | KALN | $7.70 | $8.21 |
| 12 | DuPage Flight Center | KDPA | $7.53 | $8.25 |
| 13 | Ascension FBO Network | KPWK | $9.34 | $8.39 |
| 14 | Atlantic Aviation | KMDW | $10.34 | $8.47 |
| 15 | Elliott Aviation | KMLI | $6.85 | $8.77 |
| 16 | Atlantic Aviation | KPWK | $9.29 | $8.94 |
| 17 | Signature Aviation | KMDW | $9.37 | $8.99 |
| 18 | Signature Aviation | KORD | $9.60 | $9.58 |
| 19 | Signature Aviation | KPWK | $8.96 | $9.66 |
100LL Avgas Market Analysis in Illinois
We track 100LL avgas at 19 FBOs across 16 airports in Illinois. The cheapest 100LL is $6.25/gal at Quincy Aviation (KUIN), and the highest is $9.66/gal — a $3.41/gal difference depending on where you stop. 8 FBOs are below the $7.98/gal state average. For a typical 50-gallon piston top-off, the cheapest stop saves roughly $86 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.