Cheapest 100LL Avgas in Illinois
19 FBOs with 100LL pricing · Updated daily
The average 100LL price in Illinois is $8.34/gal. Below are all FBOs ranked from cheapest to most expensive.
Prices updated daily · Last updated October 12, 2026
| # | FBO | Airport | Jet-A | 100LL |
|---|---|---|---|---|
| 1 | Midwest AviationBest Price | KMWA | $7.49 | $6.95 |
| 2 | Quincy Aviation | KUIN | $7.25 | $7.00 |
| 3 | Kankakee Valley Airport Authority | KIKK | $7.43 | $7.13 |
| 4 | Synergy Flight Center | KBMI | $8.61 | $7.56 |
| 5 | Gaitros Aviation | KDEC | $8.69 | $7.99 |
| 6 | Emery Air | KRFD | $8.45 | $8.00 |
| 7 | Flightstar | KCMI | $8.29 | $8.01 |
| 8 | Flightline | KMDH | $7.30 | $8.12 |
| 9 | Stellar Aviation of Springfield | KSPI | $8.89 | $8.13 |
| 10 | Ascension FBO Network | KPWK | $10.28 | $8.39 |
| 11 | Atlantic Aviation | KMDW | $11.51 | $8.47 |
| 12 | West Star Aviation, Inc. | KALN | $8.51 | $8.60 |
| 13 | Byerly Aviation | KPIA | $8.54 | $8.76 |
| 14 | DuPage Flight Center | KDPA | $8.70 | $8.81 |
| 15 | Elliott Aviation | KMLI | $8.02 | $8.87 |
| 16 | Atlantic Aviation | KPWK | $10.51 | $8.94 |
| 17 | Signature Aviation | KPWK | $10.25 | $9.05 |
| 18 | Signature Aviation | KORD | $10.90 | $9.58 |
| 19 | Signature Aviation | KMDW | $10.67 | $10.19 |
100LL Avgas Market Analysis in Illinois
We track 100LL avgas at 19 FBOs across 16 airports in Illinois. The cheapest 100LL is $6.95/gal at Midwest Aviation (KMWA), and the highest is $10.19/gal — a $3.24/gal difference depending on where you stop. 9 FBOs are below the $8.34/gal state average. For a typical 50-gallon piston top-off, the cheapest stop saves roughly $70 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.