Ontario to Chicago

ONTMDW

Fly from Ontario to Chicago starting at USD 128 with Frontier Airlines.Best fare available on Aug 17, 2026.Limited seats. Better plans. Book before it's gone.

Ontario to Chicago cheapest flights this week

12 Aug
Southwest Airlines
09:40ONT
15:35MDW
1 StopUSD 202VIEW DEAL
13 Aug
Frontier Airlines
08:17ONT
18:32MDW
1 StopUSD 258VIEW DEAL
15 Aug
Frontier Airlines
08:17ONT
15:26MDW
1 StopUSD 170VIEW DEAL
17 Aug
Southwest Airlines
23:55ONT
03:45MDW
DirectUSD 147VIEW DEAL
17 Aug
Frontier Airlines
08:17ONT
15:22MDW
1 StopUSD 128VIEW DEAL
17 Aug
Southwest Airlines
17:45ONT
03:40MDW
1 StopUSD 147VIEW DEAL
18 Aug
Southwest Airlines
16:45ONT
03:40MDW
1 StopUSD 129VIEW DEAL
18 Aug
Southwest Airlines
06:40ONT
15:10MDW
1 StopUSD 147VIEW DEAL
21 Aug
Frontier Airlines
08:17ONT
18:31MDW
1 StopUSD 130VIEW DEAL
22 Aug
Southwest Airlines
10:15ONT
18:15MDW
1 StopUSD 131VIEW DEAL

Ontario to Chicago monthly flight fare trend

Aug
from USD 89
Sep
from USD 95
Oct
from USD 115
Nov
from USD 147
Dec
No flights
Jan
No flights

Airport Details

Origin

Ontario

Ontario International Airport (ONT)

Ontario, ONT
Zone

Los Angeles

Elev

944 ft

Destination

Chicago

Chicago Midway International Airport (MDW)

Chicago, MDW
Zone

Chicago

Elev

620 ft