Ontario (ONT) to Chicago (MDW) flights
One airline flies nonstop from Ontario (ONT) to Chicago (MDW): Southwest Airlines. The two airports are 1,703 miles (2,741 km) apart. There are also 21 ways to fly it with one stop, through Denver, Las Vegas and Phoenix and more.
Airlines flying nonstop from ONT to MDW
- Southwest AirlinesNot in an allianceWho books it
ONT to MDW with one stop
21 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Denver (DEN)Southwest Airlines the whole way
- Via Las Vegas (LAS)Southwest Airlines the whole way
- Via Phoenix (PHX)Southwest Airlines the whole way
- Via Salt Lake City (SLC)Delta Air Lines, then Southwest Airlines
- Via Dallas (DFW)Frontier Airlines the whole way
- Via Dallas (DAL)Southwest Airlines the whole way
- Via Boise (BOI)Alaska Airlines, then Southwest Airlines
- Via Nashville (BNA)Southwest Airlines the whole way
- Via Austin (AUS)Southwest Airlines the whole way
- Via San Jose (SJC)Southwest Airlines the whole way
- Via Sacramento (SMF)Southwest Airlines the whole way
- Via Oakland (OAK)Southwest Airlines the whole way
- Via San Francisco (SFO)United Airlines and Frontier Airlines, then Southwest Airlines
- Via Houston (HOU)Southwest Airlines the whole way
- Via Atlanta (ATL)Delta Air Lines the whole way
ONT to MDW: common questions
Which airlines fly nonstop from ONT to MDW?
Southwest Airlines flies nonstop from Ontario (ONT) to Chicago (MDW).
How far is Ontario from Chicago by plane?
Ontario (ONT) and Chicago (MDW) are 1,703 miles (2,741 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
How many miles does ONT to MDW cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for ONT to MDW with taxes and fees.
Where can I connect between Ontario and Chicago?
The most direct connections are through Denver (DEN), Las Vegas (LAS), Phoenix (PHX), Salt Lake City (SLC) and Dallas (DFW). On 15 of them the same airline flies both flights, for example Southwest Airlines through Denver.
More routes
Routes are scheduled nonstop flights. The route data is refreshed monthly; this list was last checked November 11, 2026. Seasonal routes and new launches can be missing or end early, so confirm with the airline before you book. Distances are great-circle, the shortest path between the two airports.