Cheapest 100LL Avgas in Illinois
19 FBOs with 100LL pricing · Updated daily
The average 100LL price in Illinois is $7.85/gal. Below are all FBOs ranked from cheapest to most expensive.
Prices updated daily · Last updated July 8, 2026
| # | FBO | Airport | Jet-A | 100LL |
|---|---|---|---|---|
| 1 | Midwest AviationBest Price | KMWA | $6.69 | $5.95 |
| 2 | Quincy Aviation | KUIN | $6.95 | $6.50 |
| 3 | Kankakee Valley Airport Authority | KIKK | $7.61 | $6.88 |
| 4 | Gaitros Aviation | KDEC | $8.39 | $6.93 |
| 5 | Emery Air | KRFD | $6.61 | $7.10 |
| 6 | Flightstar | KCMI | $6.51 | $7.17 |
| 7 | Flightline | KMDH | $6.50 | $7.19 |
| 8 | West Star Aviation, Inc. | KALN | $7.20 | $7.66 |
| 9 | Synergy Flight Center | KBMI | $6.79 | $7.68 |
| 10 | Byerly Aviation | KPIA | $6.70 | $7.77 |
| 11 | Stellar Aviation of Springfield | KSPI | $7.04 | $8.03 |
| 12 | DuPage Flight Center | KDPA | $6.99 | $8.15 |
| 13 | Ascension FBO Network | KPWK | $8.44 | $8.39 |
| 14 | Atlantic Aviation | KMDW | $9.60 | $8.47 |
| 15 | Elliott Aviation | KMLI | $6.53 | $8.77 |
| 16 | Atlantic Aviation | KPWK | $8.92 | $8.94 |
| 17 | Signature Aviation | KMDW | $8.86 | $8.99 |
| 18 | Signature Aviation | KPWK | $8.44 | $9.05 |
| 19 | Signature Aviation | KORD | $9.08 | $9.58 |
100LL Avgas Market Analysis in Illinois
We track 100LL avgas at 19 FBOs across 16 airports in Illinois. The cheapest 100LL is $5.95/gal at Midwest Aviation (KMWA), and the highest is $9.58/gal — a $3.63/gal difference depending on where you stop. 10 FBOs are below the $7.85/gal state average. For a typical 50-gallon piston top-off, the cheapest stop saves roughly $95 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.