Ontario (ONT) to Chicago (ORD) flights
2 airlines fly nonstop from Ontario (ONT) to Chicago (ORD): American Airlines and United Airlines. The two airports are 1,696 miles (2,730 km) apart. American Airlines is in oneworld and United Airlines is in Star Alliance. There are also 20 ways to fly it with one stop, through Denver, Las Vegas and Phoenix and more.
Airlines flying nonstop from ONT to ORD
- American Airlinesoneworld · bookable with 9 programsWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book ONT to ORD with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Air Canada AeroplanBooks United Airlines
- Air New Zealand AirpointsBooks United Airlines
- Alaska Atmos RewardsBooks American Airlines
- American AAdvantageBooks American Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- British Airways ClubBooks American Airlines
- Cathay Pacific Asia MilesBooks American Airlines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- Finnair PlusBooks American Airlines
- Iberia ClubBooks American Airlines
- JAL Mileage BankBooks American Airlines
- JetBlue TrueBlueBooks United Airlines
- Lufthansa Miles & MoreBooks United Airlines
- Qantas Frequent FlyerBooks American Airlines
- Qatar Airways Privilege ClubBooks American Airlines
- Singapore Airlines KrisFlyerBooks United Airlines
- TAP Miles&GoBooks United Airlines
- Thai Royal Orchid PlusBooks United Airlines
- Turkish Airlines Miles&SmilesBooks United Airlines
- United MileagePlusBooks United Airlines
ONT to ORD with one stop
20 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Denver (DEN)Frontier Airlines and United Airlines the whole way
- Via Las Vegas (LAS)Frontier Airlines the whole way
- Via Phoenix (PHX)American Airlines the whole way
- Via Salt Lake City (SLC)Delta Air Lines the whole way
- Via Dallas (DFW)American Airlines and Frontier Airlines the whole way
- Via Boise (BOI)Alaska Airlines, then American Airlines and United Airlines
- Via Nashville (BNA)Southwest Airlines, then American Airlines and United Airlines
- Via San Jose (SJC)Southwest Airlines, then United Airlines
- Via Sacramento (SMF)Southwest Airlines and Frontier Airlines, then American Airlines and United Airlines
- Via Austin (AUS)Southwest Airlines, then American Airlines and United Airlines
- Via San Francisco (SFO)United Airlines the whole way
- Via Houston (IAH)United Airlines and Frontier Airlines the whole way
- Via Atlanta (ATL)Delta Air Lines the whole way+1
- Via Portland (PDX)Alaska Airlines the whole way
- Via Seattle (SEA)Alaska Airlines and Delta Air Lines the whole way+1
ONT to ORD: common questions
Which airlines fly nonstop from ONT to ORD?
American Airlines (oneworld) and United Airlines (Star Alliance) fly nonstop from Ontario (ONT) to Chicago (ORD).
How far is Ontario from Chicago by plane?
Ontario (ONT) and Chicago (ORD) are 1,696 miles (2,730 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book ONT to ORD award flights?
22 programs can book at least one of the nonstop airlines: Air Canada Aeroplan, Air New Zealand Airpoints, Alaska Atmos Rewards, American AAdvantage, ANA Mileage Club, Avianca LifeMiles, British Airways Club, Cathay Pacific Asia Miles and 14 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does ONT to ORD 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 ORD 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 Frontier 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.