Nonstop flights from Chicago to Ontario from $150 MDW, ORD → ONT
Chicago Midway International Airport (MDW), O'Hare International Airport (ORD) → Ontario International Airport (ONT)
The cheapest nonstop return found recently is $246 with Southwest Airlines, 9 Dec – 12 Dec, found yesterday.
Nonstop return
The cheapest nonstop return fare on each of 8 departure dates is usually $355 to $455.
Cheapest nonstop return
$246
9 Dec – 12 Dec · Southwest Airlines
Chicago Midway International Airport (MDW) → Ontario International Airport (ONT)
Leaves 3:55 p.m. · Return leaves 6:30 a.m. · 8 h 15 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Airlines flying it nonstop on the return fares we hold: Southwest Airlines (8 departure dates), United Airlines (7 departure dates), American Airlines (5 departure dates), Frontier Airlines (1 departure date).
On the 13 trips where we hold both on the same dates, nonstop cost a median $113 (53.7%) more than the cheapest fare with stops. Nonstop was cheaper or the same price on 3 of those 13 trips.
Every nonstop date we hold
Nonstop fares on 8 of the 11 departure dates we hold for this route.
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 15 Nov – 17 Nov | $684 | United Airlines | O'Hare International Airport (ORD) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 2 Dec – 4 Dec | $449 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 5 Dec – 7 Dec | $372 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 9 Dec – 12 Dec | $246 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 10 Dec – 8 Jan 2027 | $302 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 7 days ago | See prices for these dates |
| 8 Mar 2027 – 14 Mar 2027 | $381 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 1 Apr 2027 – 4 Apr 2027 | $474 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 26 May 2027 – 11 Jun 2027 | $441 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
Nonstop one-way
The cheapest nonstop one-way fare on each of 8 departure dates is usually $175 to $232.
Cheapest nonstop one-way
$150
25 Jan 2027 · Southwest Airlines
Chicago Midway International Airport (MDW) → Ontario International Airport (ONT)
Leaves 3:45 p.m. · 4 h 25 min trip
nonstop
found 3 days ago
Airlines flying it nonstop on the one-way fares we hold: Southwest Airlines (8 departure dates), United Airlines (3 departure dates), American Airlines (1 departure date).
On the 4 trips where we hold both on the same dates, nonstop cost a median $41 (26.3%) more than the cheapest fare with stops. Nonstop was cheaper or the same price on 0 of those 4 trips.
Every nonstop date we hold
Nonstop fares on 8 of the 14 departure dates we hold for this route.
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 19 Nov | $354 | United Airlines | O'Hare International Airport (ORD) → Ontario International Airport (ONT) | nonstop | found 8 days ago | See prices for these dates |
| 25 Jan 2027 | $150 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | nonstop | found 3 days ago | Open this trip |
| 13 Feb 2027 | $161 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | nonstop | found 4 days ago | Open this trip |
| 11 May 2027 | $180 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | nonstop | found 3 days ago | Open this trip |
| 25 May 2027 | $182 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | nonstop | found 5 days ago | Open this trip |
| 26 May 2027 | $182 | Southwest Airlines | Chicago Midway International Airport (MDW) → Ontario International Airport (ONT) | nonstop | found 5 days ago | Open this trip |
| 28 May 2027 | $234 | United Airlines | O'Hare International Airport (ORD) → Ontario International Airport (ONT) | nonstop | found 3 days ago | Open this trip |
| 15 Jul 2027 | $231 | United Airlines | O'Hare International Airport (ORD) → Ontario International Airport (ONT) | nonstop | found 6 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