Chicago O'Hare (ORD) posts the strongest verified-coverage ratio in this batch: 16 of its 25 tracked destinations, 64 percent, carry a verified historical direct-service record. That includes all 9 domestic U.S. pairs and 7 of the 16 international ones — every Canadian city tracked here, plus Manchester and London Heathrow in the UK.
The breakdown splits cleanly by geography. Domestic and Canadian routes are verified across the board, 14 of 14 combined, which fits Chicago's position as a major North American connecting hub with dense, well-documented service to nearby markets. The UK is a mixed picture at 2 of 6 verified, and Australia is 0 of 5, so for a Chicago client headed to Sydney or Melbourne this dataset confirms the distance and time-zone math but not a nonstop, and the routing should be built around a real connection point.
All 9 of Chicago's U.S. domestic pairs are verified, from a 1.1-hour hop to Atlanta up to a 3.5-hour run to San Francisco, with Atlanta alone showing 12 historical carriers, the same standout carrier count Atlanta shows from Miami.
| Destination | Country | Distance | Flight Time | Haul | Verified Service |
|---|---|---|---|---|---|
Atlanta ATL |
United States | 976 km / 606 mi | ≈ 1.1h | Short-haul | ✓ 12 carriers |
Newark EWR |
United States | 1,154 km / 717 mi | ≈ 1.4h | Short-haul | ✓ 3 carriers |
New York JFK |
United States | 1,188 km / 738 mi | ≈ 1.4h | Short-haul | ✓ 5 carriers |
Dallas DFW |
United States | 1,290 km / 802 mi | ≈ 1.5h | Short-haul | ✓ 4 carriers |
Boston BOS |
United States | 1,391 km / 864 mi | ≈ 1.6h | Short-haul | ✓ 5 carriers |
Miami MIA |
United States | 1,930 km / 1,199 mi | ≈ 2.3h | Short-haul | ✓ 3 carriers |
Seattle SEA |
United States | 2,762 km / 1,716 mi | ≈ 3.2h | Medium-haul | ✓ 4 carriers |
Los Angeles LAX |
United States | 2,802 km / 1,741 mi | ≈ 3.3h | Medium-haul | ✓ 6 carriers |
San Francisco SFO |
United States | 2,964 km / 1,842 mi | ≈ 3.5h | Medium-haul | ✓ 5 carriers |
Chicago's international side splits cleanly by geography: every tracked Canadian pair, Toronto, Ottawa, Montreal, Calgary, and Vancouver, 5 of 5, is verified; the UK is 2 of 6 (Manchester and London Heathrow); and none of the 5 Australian pairs carry a verified nonstop record, so those should be planned through a connection and confirmed in your GDS.
| Destination | Country | Distance | Flight Time | Haul | Verified Service |
|---|---|---|---|---|---|
Toronto YYZ |
Canada | 701 km / 436 mi | ≈ 0.8h | Short-haul | ✓ 6 carriers |
Ottawa YOW |
Canada | 1,051 km / 653 mi | ≈ 1.2h | Short-haul | ✓ 2 carriers |
Montreal YUL |
Canada | 1,201 km / 746 mi | ≈ 1.4h | Short-haul | ✓ 6 carriers |
Calgary YYC |
Canada | 2,224 km / 1,382 mi | ≈ 2.6h | Short-haul | ✓ 5 carriers |
Vancouver YVR |
Canada | 2,831 km / 1,759 mi | ≈ 3.3h | Medium-haul | ✓ 5 carriers |
Glasgow GLA |
United Kingdom | 5,900 km / 3,666 mi | ≈ 6.9h | Long-haul | — no record |
Edinburgh EDI |
United Kingdom | 5,957 km / 3,702 mi | ≈ 7.0h | Long-haul | — no record |
Manchester MAN |
United Kingdom | 6,140 km / 3,815 mi | ≈ 7.2h | Long-haul | ✓ 5 carriers |
Birmingham BHX |
United Kingdom | 6,216 km / 3,862 mi | ≈ 7.3h | Long-haul | — no record |
London LHR |
United Kingdom | 6,345 km / 3,942 mi | ≈ 7.5h | Long-haul | ✓ 9 carriers |
London LGW |
United Kingdom | 6,378 km / 3,963 mi | ≈ 7.5h | Long-haul | — no record |
Brisbane BNE |
Australia | 14,328 km / 8,903 mi | ≈ 16.9h | Long-haul | — no record |
Sydney SYD |
Australia | 14,862 km / 9,235 mi | ≈ 17.5h | Long-haul | — no record |
Melbourne MEL |
Australia | 15,556 km / 9,666 mi | ≈ 18.3h | Long-haul | — no record |
Adelaide ADL |
Australia | 15,948 km / 9,910 mi | ≈ 18.8h | Long-haul | — no record |
Perth PER |
Australia | 17,630 km / 10,955 mi | ≈ 20.7h | Long-haul | — no record |
16 of Chicago's 25 tracked connections, a clear majority, carry a verified historical operating record: every domestic and Canadian pair, plus Manchester and London Heathrow — a genuinely well-documented network by the standards of this dataset, with the gaps concentrated in the UK's smaller cities and all of Australia.
OpenFlights' historical route dataset records 12 carriers operating this city pair, flying 717, CR7, E75 and other types. It's the best-served pair in Chicago's whole tracked network — still confirm current-day operation and schedule in your GDS before quoting, since this dataset reflects historical service, not a live timetable.
AA American AirlinesAF Air FranceAZ AlitaliaBA British AirwaysCX Cathay Pacific9 carriers on record (Airbus A340-300, Boeing 747-400, Boeing 767-300) — solidly served, competitive pricing across at least a few airlines historically.
AA American AirlinesAY FinnairBA British AirwaysDL Delta Air LinesIB Iberia Airlines6 carriers on record (Airbus A320, CR7, E75 and other types) — solidly served, competitive pricing across at least a few airlines historically.
AA American AirlinesAC Air CanadaEY Etihad AirwaysUA United AirlinesUS US Airways6 carriers on record (Bombardier CRJ, CR7, E75) — solidly served, competitive pricing across at least a few airlines historically.
AA American AirlinesAC Air CanadaEY Etihad AirwaysUA United AirlinesUS US AirwaysAvailability checks from Chicago use ORD as the origin code across Amadeus, Sabre, Galileo, and Apollo, the same syntax whether you're pricing the short domestic hop to Atlanta or the long-haul run toward Sydney.
Amadeus: AN15JULORDxxx Sabre: A15JUNORDxxx Galileo: A/15JUNORDxxx
Replace xxx with the destination's own 3-letter IATA code from the tables above — the availability-check syntax itself doesn't change by destination, only the city pair does.
This reference tracks 25 city pairs from Chicago: 9 domestic U.S. routes and 16 international, covering Canada, the United Kingdom, and Australia.
16 of 25, or 64 percent, the highest ratio in this batch. That includes all 9 domestic pairs and 7 of 16 international ones.
Yes. Toronto, Ottawa, Montreal, Calgary, and Vancouver all carry a verified historical direct-service record, the only fully-verified international country group in Chicago's tracked network.
No. None of the 5 Australian pairs tracked here, Brisbane, Sydney, Melbourne, Adelaide, and Perth, show a verified historical direct-service record. Distances run 14,328 to 17,630 km; plan these as connections and confirm current routing in your GDS.
Manchester and London Heathrow both carry a verified historical direct-service record; Glasgow, Edinburgh, Birmingham, and London Gatwick do not.
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