Nonstop flights from Ontario to Chicago from $136 ONT → MDW, ORD
Ontario International Airport (ONT) → Chicago Midway International Airport (MDW), O'Hare International Airport (ORD)
The cheapest nonstop return found recently is $418 with Frontier Airlines, 30 Dec – 3 Jan 2027, found 2 days ago.
Nonstop return
The cheapest nonstop return fare on each of 11 departure dates is usually $356 to $468.
Cheapest nonstop return
$418
30 Dec – 3 Jan 2027 · Frontier Airlines
Ontario International Airport (ONT) → Chicago Midway International Airport (MDW)
Leaves 11:55 p.m. · Return leaves 10:24 a.m. · 8 h 29 min of travel, both ways together
out nonstop, back nonstop · separate tickets likely: collect your bags and check in again
found 2 days ago
Airlines flying it nonstop on the return fares we hold: Southwest Airlines (11 departure dates), American Airlines (9 departure dates), United Airlines (9 departure dates), Frontier Airlines (7 departure dates).
On the 16 trips where we hold both on the same dates, nonstop cost a median $52 (18.8%) more than the cheapest fare with stops. Nonstop was cheaper or the same price on 6 of those 16 trips.
Every nonstop date we hold
Nonstop fares on 11 of the 14 departure dates we hold for this route.
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 18 Nov – 23 Nov | $530 | Frontier Airlines | Ontario International Airport (ONT) → O'Hare International Airport (ORD) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 22 Nov – 3 Dec | $469 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 7 days ago | See prices for these dates |
| 11 Dec – 15 Dec | $266 | American Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 15 Dec – 3 Jan 2027 | $467 | United Airlines | Ontario International Airport (ONT) → O'Hare International Airport (ORD) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 23 Dec – 27 Dec | $499 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 28 Dec – 4 Jan 2027 | $306 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 29 Dec – 2 Jan 2027 | $437 | American Airlines | Ontario International Airport (ONT) → O'Hare International Airport (ORD) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 30 Dec – 3 Jan 2027 | $418 | Frontier Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 2 days ago | See prices for these dates |
| 31 Dec – 3 Jan 2027 | $407 | Frontier Airlines | Ontario International Airport (ONT) → O'Hare International Airport (ORD) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 12 Feb 2027 – 21 Feb 2027 | $266 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 7 days ago | See prices for these dates |
| 19 Mar 2027 – 21 Mar 2027 | $429 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
Nonstop one-way
The cheapest nonstop one-way fare on each of 5 departure dates is usually $120 to $151.
Cheapest nonstop one-way
$136
17 Feb 2027 · Southwest Airlines
Ontario International Airport (ONT) → Chicago Midway International Airport (MDW)
Leaves 6:30 a.m. · 3 h 55 min trip
nonstop
found 3 days ago
Airlines flying it nonstop on the one-way fares we hold: Southwest Airlines (5 departure dates), United Airlines (3 departure dates), American Airlines (1 departure date).
On the 3 trips where we hold both on the same dates, nonstop cost a median $14 (10.4%) more than the cheapest fare with stops. Nonstop was cheaper or the same price on 0 of those 3 trips.
Every nonstop date we hold
Nonstop fares on 5 of the 8 departure dates we hold for this route.
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 31 Dec | $207 | United Airlines | Ontario International Airport (ONT) → O'Hare International Airport (ORD) | nonstop | found 6 days ago | Open this trip |
| 21 Jan 2027 | $151 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | nonstop | found 4 days ago | Open this trip |
| 11 Feb 2027 | $120 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | nonstop | found 7 days ago | Open this trip |
| 12 Feb 2027 | $119 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | nonstop | found 7 days ago | Open this trip |
| 17 Feb 2027 | $136 | Southwest Airlines | Ontario International Airport (ONT) → Chicago Midway International Airport (MDW) | nonstop | found 3 days ago | Open this trip |
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work