73% of flights from Bangor to Chicago arrived on time over the past 12 months. That is worse than the typical U.S. route. The 6 a.m. departures ran on time 84% of the time; the 4 p.m. ones 60%. Most reliable airline: American Airlines (73%). 13% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for BGR → ORD: when a flight was late, it was under 45 minutes late 45% of the time. About 1 in 9 flights landed an hour or more late, and 1 in 32 three hours or more; 1.7% were cancelled outright.
- On time or early73%
- 15–30 min late7.6%
- 30–60 min late5.9%
- 1–2 hours late5.8%
- 2–3 hours late2.5%
- 3+ hours late3.1%
- Diverted0.3%
- Cancelled1.7%
Share of all 712 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| American Airlines | 415 | 73% | 1.7% | −9 min | 12.8% | +130 min | American Airlines 62%, Envoy 19%, Republic Airways 19% |
| United Airlines | 297 | 73% | 1.7% | −2 min | 9.4% | +86 min | SkyWest 66%, Republic Airways 31%, United Airlines 3% |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at BGR). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | American Airlines | United Airlines |
|---|---|---|
| 6 a.m. | — | 82% |
| noon | 74% | — |
| 4 p.m. | — | 60% |
Last flight of the day
On BGR → ORD, each airline's last flight of the day was cancelled 3.3% of the time, against 0.3% for its earlier flights (11.3× as often). It arrived 3+ hours late 5.4% of the time (earlier flights: 1.2%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| American Airlines | 12:59 p.m. | 3.0% | 4.6% | 0.5% | first flight 7:01 a.m. |
| United Airlines | 4:35 p.m. | 3.6% | 6.5% | 0.0% | first flight 6:00 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in ORD tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: May (83%). Worst: August (62%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 108 | 72% | 2.8% |
| Tuesday | 87 | — | — |
| Wednesday | 95 | — | — |
| Thursday | 106 | 76% | 2.8% |
| Friday | 107 | 73% | 1.9% |
| Saturday | 107 | 70% | 0.9% |
| Sunday | 102 | 70% | 2.0% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 10 · airline 1 · air traffic/airport 1
Month by month
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Sep 13, 2025 | 4 | 0% | 0 |
| Aug 16, 2026 | 4 | 0% | 0 |
| Aug 12, 2026 | 4 | 0% | 0 |
| Aug 7, 2026 | 4 | 25% | 0 |
| Aug 13, 2026 | 4 | 25% | 0 |
Questions
How often are flights from BGR to ORD on time?
73% of 712 scheduled flights from Bangor, ME to Chicago, IL arrived within 15 minutes of schedule between September 2025 and August 2026. 1.7% were cancelled.
What is the best time of day to fly BGR to ORD?
Flights scheduled to leave at 6 a.m. were the most reliable (84% on time). The 4 p.m. departures were the least (60%).
Which airline is most on time from BGR to ORD?
American Airlines: 73% of its 415 flights on the route arrived on time. United Airlines: 73%.
What month has the most delays from BGR to ORD?
August (62% on time). The best month is May (83%), over 2023–2026.
Is the last flight of the day from BGR to ORD more likely to be cancelled?
Yes. Each airline's last BGR–ORD flight of the day was cancelled 3.3% of the time over the past year, against 0.3% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- ORD → BGR (return)
- Bangor (BGR) delays by hour
- Flights into Chicago O'Hare (ORD)
- American Airlines on-time record
- United Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.