Cheap flights from Chicago to Ontario
Cheapest return fare right now: $229Oct 22 – Oct 30 · Frontier Airlines
- Direct flights
- No
- Typical flight time
- 5 h 17 min
- Price range seen
- $229 – $275
- Cheapest month (next 3 months)
- October 2026
Best dates
| Dates | Nights | Airline | Stops | From | Price | |
|---|---|---|---|---|---|---|
| Oct 22 – Oct 30 | 8 | Frontier Airlines | 1 | Chicago Midway | $229 | Book → |
| Oct 16 – Oct 24 | 8 | Frontier Airlines | 1 | Chicago O'Hare | $249 | Book → |
| Oct 19 – Oct 27 | 8 | Frontier Airlines | 1 | Chicago O'Hare | $251 | Book → |
| Oct 26 – Oct 30 | 3 | Frontier Airlines | 1 | Chicago O'Hare | $260 | Book → |
| Oct 14 – Oct 20 | 6 | Frontier Airlines | 1 | Chicago O'Hare | $275 | Book → |
Prices checked on October 12, 2026.
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