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London to Chicago
The following tables show a breakdown of airline punctuality for scheduled flights between the five London airports and Chicago for each year, and the year to date for which data is available.

All flights in both directions on the route are counted, by analysing the punctuality of both arrivals and depatures at the London airport(s).
 
  Most Punctual Airline on this Route
Year Airline Avg. Delay
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Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1Virgin Atlantic Airways         5.0789.791.500.30333
2United Airlines    14.2082.256.041.492,085
3British Airways    17.5868.885.471.111,443
4American Airlines    26.1571.8212.813.182,452
 ROUTE AVERAGE19.1375.548.302.006,313

Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1United Airlines    10.3783.944.860.522,098
2Virgin Atlantic Airways         11.6178.793.330.91330
3British Airways    16.2471.404.801.111,437
4American Airlines    27.5972.0912.863.352,060
 ROUTE AVERAGE17.8576.497.541.675,925

Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1Virgin Atlantic Airways         8.8681.322.590.29348
2United Airlines    13.6877.565.461.092,108
3British Airways    18.7065.286.170.551,443
4American Airlines    22.0973.508.412.392,472
 ROUTE AVERAGE17.8273.416.611.436,371

Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1Virgin Atlantic Airways          9.0583.024.010.00324
2United Airlines    14.1378.396.111.002,110
3American Airlines    15.2974.695.691.072,513
4British Airways    20.8465.356.321.391,440
 ROUTE AVERAGE15.8474.235.891.066,387

Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1Virgin Atlantic Airways          8.3183.772.920.32308
2United / Continental    15.3576.086.571.242,099
3British Airways    17.7370.035.470.621,445
4American Airlines    20.0372.076.351.752,521
 ROUTE AVERAGE17.4073.506.061.266,373

Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1Virgin Atlantic Airways          8.6682.722.990.00301
2American Airlines    13.3476.874.740.792,529
3British Airways    14.4276.324.310.691,440
4United Airlines    15.2079.366.801.662,103
 ROUTE AVERAGE13.9877.845.241.026,373

Operating airportsOperating monthsAverage
delay
(mins)
Operated
within 15
mins (%)
Over
1 hour
late (%)
Over
3 hours
late (%)
Total
flights
analysed
RankAirlineLHRLGWLCYSTNLTNJFMAMJJASOND
1Virgin Atlantic Airways           11.1077.065.050.00218
2United Airlines    14.5773.245.890.712,104
3American Airlines    21.1166.338.380.932,483
4British Airways    23.3057.637.741.351,409
 ROUTE AVERAGE19.0467.077.270.926,214

2009
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 Virgin Atlantic *         12.73 75.12 3.72 0.23 430
2 United Airlines         13.13 78.13 5.34 0.65 2,154
3 American Airlines         14.59 74.53 5.35 0.62 2,411
4 British Airways         14.73 71.13 5.27 0.36 1,936
  AVERAGE ALL 4 AIRLINES > > > 14.06 74.74 5.22 0.53 6,931
* - Virgin Atlantic discontinued LHR-ORD during September 2009


2008
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 Virgin Atlantic         15.22 70.16 4.80 0.73 687
2 American Airlines         19.78 65.49 7.60 0.97 3,106
3 United Airlines         23.30 60.59 10.59 1.35 2,152
4 British Airways         26.43 51.76 9.03 1.26 2,071
5 Air India *         46.51 52.17 21.74 7.91 253
  AVERAGE ALL 5 AIRLINES > > > 22.80 60.76 8.94 1.33 8,269
* - Air India discontinued LHR-ORD during October 2008


2007
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 Virgin Atlantic ^         15.57 68.76 5.27 0.41 493
2 United Airlines         16.02 71.30 6.75 0.92 2,164
3 American Airlines         18.11 66.87 6.77 0.98 3,353
4 British Airways         28.57 46.59 9.71 1.21 2,153
5 Air India         86.52 39.10 37.18 15.38 312
  AVERAGE ALL 5 AIRLINES > > > 22.61 61.94 8.54 1.52 8,475
^ - Virgin Atlantic commenced LHR-ORD during April 2007

2006
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 United Airlines         18.58 66.16 7.93 0.64 2,181
2 American Airlines         19.73 65.50 6.89 1.07 3,281
3 British Airways         27.99 50.96 10.91 1.02 1,568
4 Air India         55.56 40.38 27.24 7.69 312
  AVERAGE ALL 4 AIRLINES > > > 22.68 61.52 8.92 1.21 7,342
 

2005
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 American Airlines         12.99 74.92 3.58 0.43 3,265
2 British Airways         17.32 65.18 6.13 0.49 1,436
3 United Airlines         17.63 68.54 6.85 0.91 2,190
4 Air India         52.15 49.20 21.22 7.72 311
  AVERAGE ALL 4 AIRLINES > > > 16.96 69.93 5.85 0.90 7,202
 

2004
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 American Airlines         11.26 79.21 3.61 0.28 3,271
2 British Airways         14.03 72.34 4.62 0.41 1,450
3 United Airlines         14.26 72.55 4.77 0.40 2,244
4 Air India         27.80 58.47 7.35 1.60 313
  AVERAGE ALL 4 AIRLINES > > > 13.45 74.90 4.33 0.40 7,278
 

2003
  Operating from London Airports Avg. Delay (mins) OTP Within 15 mins (%) 1 hr+ late (%) 3 hrs+ late (%) Total Flights Analysed
Rank Airline LHR LGW LCY STN LTN
1 American Airlines         9.92 83.69 3.00 0.40 2,967
2 United Airlines         11.83 80.44 4.27 0.66 2,132
3 British Airways         16.73 79.10 5.42 1.27 1,421
4 Air India         39.00 55.27 11.82 2.88 313
  AVERAGE ALL 4 AIRLINES > > > 13.27 80.42 4.30 0.78 6,833
 

 
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