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Ontario to Chicago in October 2026 ONT → MDW, ORD

Ontario International Airport (ONT) → Chicago Midway International Airport (MDW), O'Hare International Airport (ORD)

For departures in October 2026, the cheapest return found recently is $283 with Frontier Airlines, 20 Oct – 22 Oct, found 2 days ago. The cheapest one-way found recently is $115 with Frontier Airlines, 20 Oct, found 2 days ago.

Return

We hold return fares on only 1 departure date in October 2026, too few to say what one usually costs.

Cheapest return found recently

$283

20 Oct – 22 Oct · Frontier Airlines

Ontario International Airport (ONT) → O'Hare International Airport (ORD)

out 1 stop, back 1 stop

found 2 days ago

See prices for these datesCheck today's price

It is also the cheapest return we hold, of any age.

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The cheapest dates in October 2026

DatesFromAirlineStopsFound
20 Oct – 22 Oct$283Frontier Airlinesout 1 stop, back 1 stopfound 2 days agoSee prices for these dates

Every date we hold

1 departure date

See every date as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
20 Oct – 22 Oct$283Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates

Which month looks cheapest?

November 2026 is the cheapest month — from $239.

October 2026From $2831 departure date20 Oct – 22 Oct · found 2 days agoSee prices for these dates
November 2026From $239Cheapest seen1 departure date1 Nov – 3 Nov · found yesterdaySee prices for these dates
January 2027From $2431 departure date15 Jan 2027 – 22 Jan 2027 · found 4 days agoSee prices for these dates
February 2027From $3051 departure date1 Feb 2027 – 4 Feb 2027 · found 3 days agoSee prices for these dates

One-way

In October 2026, the cheapest one-way fare on each of 7 departure dates is usually $117 to $119. Across all 11 departure dates we hold on this route, it is usually $119 to $140.

Cheapest one-way found recently

$115

20 Oct · Frontier Airlines

Ontario International Airport (ONT) → O'Hare International Airport (ORD)

1 stop

found 2 days ago

Open this tripCheck today's price

Cheapest we hold, of any age

$114

23 Oct · Frontier Airlines

Ontario International Airport (ONT) → O'Hare International Airport (ORD)

1 stop

found 6 days ago

Open this tripCheck today's price

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The cheapest dates in October 2026

DatesFromAirlineStopsFound
23 Oct$114Frontier Airlines1 stopfound 6 days agoOpen this trip
20 Oct$115Frontier Airlines1 stopfound 2 days agoOpen this trip
24 Oct$119Frontier Airlines1 stopfound 5 days agoOpen this trip
26 Oct$119Frontier Airlines1 stopfound 2 days agoOpen this trip
27 Oct$119Frontier Airlines1 stopfound 2 days agoOpen this trip

Every date we hold

7 departure dates

20 Oct: $115, found 2 days ago22 Oct: $146, found 6 days ago23 Oct: $114, found 6 days ago24 Oct: $119, found 5 days ago26 Oct: $119, found 2 days ago27 Oct: $119, found 2 days ago31 Oct: $119, found 3 days agoOct
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
20 Oct$115Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 2 days agoOpen this trip
22 Oct$146Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 6 days agoOpen this trip
23 Oct$114Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 6 days agoOpen this trip
24 Oct$119Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 5 days agoOpen this trip
26 Oct$119Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 2 days agoOpen this trip
27 Oct$119Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 2 days agoOpen this trip
31 Oct$119Frontier AirlinesOntario International Airport (ONT) → O'Hare International Airport (ORD)1 stopfound 3 days agoOpen this trip

Which month looks cheapest?

October 2026 is the cheapest month — from $114.

October 2026From $114Cheapest seen7 departure dates23 Oct · found 6 days agoOpen this trip
November 2026From $1322 departure dates20 Nov · found 5 days agoOpen this trip
January 2027From $2341 departure date3 Jan 2027 · found 6 days agoOpen this trip
August 2027From $2171 departure date20 Aug 2027 · found yesterdayOpen 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