UA4399 United Airlines - Flight Status
Below, you can find details about United Airlines flight UA4399, which currently operates between the airports of Saint Louis - St Louis Lambert International Airport (Airport Code STL) and Chicago - Chicago O'Hare International Airport (Airport Code ORD).
This flight data pertains specifically to the flight's details for Wednesday, December 17, 2025.
Table of contents:
Flight Status Codeshare Flights Additional Information Alternative Flights Punctuality and delays Last Past Flights UA4399
Flight Status Codeshare Flights Additional Information Alternative Flights Punctuality and delays Last Past Flights UA4399
UA4399 On Time performance:
n/a
It is not possible to calculate the On-Time Performance for this flight accurately due to insufficient or non-representative data, as doing so could lead to misleading conclusions. Flight Status
UA4399 United Airlines to Chicago
This flight is not scheduled for July 10, 2026.
This flight is not scheduled for July 10, 2026.
Airline information
United Airlines
Departure
Saint Louis (STL)
December 17, 2025
St Louis Lambert International Airport
Arrival
Chicago (ORD)
December 17, 2025
Chicago O'Hare International Airport
Disclaimer
The information displayed on this website is gathered from third-party providers with a wide reputation on the sector, which in turn obtain the information from the airlines. This data is provided only for informative purposes. www.saint-louis-airport.com assumes no responsibility for loss or damage as a result of relying on information posted here. Please contact your airline to verify flight status.
Codeshare Flights
This flight is shared with other airlines, this means that these other flights are the same:
- AC4935 - Air Canada
- AV2331 - Avianca
- NZ2900 - Air New Zealand
Additional Information
Which is the frequency of flight UA4399?
The flight UA4399 is currently not scheduled at Lambert St Louis Airport.
Which is the distance of flight UA4399?
The distance between the two airports is 258 miles.
Are the departure airport and arrival airport at the same Time Zone?
Yes, both airports are in the same timezone.
The flight UA4399 is currently not scheduled at Lambert St Louis Airport.
Which is the distance of flight UA4399?
The distance between the two airports is 258 miles.
Are the departure airport and arrival airport at the same Time Zone?
Yes, both airports are in the same timezone.
Alternative Flights
The following airlines serves the same route between Saint Louis and Chicago:
American Airlines
- Flight Number: AA1926. (On Time performance: 65 - Average Delay: 42 minutes)
- Flight Number: AA2324. (On Time performance: 80 - Average Delay: 27 minutes)
- Flight Number: AA3815. (On Time performance: 74 - Average Delay: 35 minutes)
- Flight Number: AA4104. (On Time performance: 92 - Average Delay: 16 minutes)
- Flight Number: AA4144. (On Time performance: 55 - Average Delay: 25 minutes)
- Flight Number: AA4537. (On Time performance: 76 - Average Delay: 24 minutes)
- Flight Number: AA6352. (On Time performance: 65 - Average Delay: 63 minutes)
GoJet Airlines
- Flight Number: G74517.
United Airlines
- Flight Number: UA1008. (On Time performance: 89 - Average Delay: 7 minutes)
- Flight Number: UA1382. (On Time performance: 69 - Average Delay: 21 minutes)
- Flight Number: UA1639. (On Time performance: 61 - Average Delay: 58 minutes)
- Flight Number: UA2805. (On Time performance: 86 - Average Delay: 6 minutes)
- Flight Number: UA4165. (On Time performance: 77 - Average Delay: 13 minutes)
- Flight Number: UA4183. (On Time performance: 93 - Average Delay: 6 minutes)
- Flight Number: UA4395. (On Time performance: 77 - Average Delay: 40 minutes)
- Flight Number: UA4411. (On Time performance: 59 - Average Delay: 31 minutes)
- Flight Number: UA4423. (On Time performance: 90 - Average Delay: 8 minutes)
- Flight Number: UA4452. (On Time performance: 50 - Average Delay: 47 minutes)
- Flight Number: UA4517. (On Time performance: 84 - Average Delay: 8 minutes)
- Flight Number: UA4536. (On Time performance: 63 - Average Delay: 45 minutes)
- Flight Number: UA4567. (On Time performance: 95 - Average Delay: 3 minutes)
- Flight Number: UA5572. (On Time performance: 69 - Average Delay: 27 minutes)
American Airlines
- Flight Number: AA1926. (On Time performance: 65 - Average Delay: 42 minutes)
- Flight Number: AA2324. (On Time performance: 80 - Average Delay: 27 minutes)
- Flight Number: AA3815. (On Time performance: 74 - Average Delay: 35 minutes)
- Flight Number: AA4104. (On Time performance: 92 - Average Delay: 16 minutes)
- Flight Number: AA4144. (On Time performance: 55 - Average Delay: 25 minutes)
- Flight Number: AA4537. (On Time performance: 76 - Average Delay: 24 minutes)
- Flight Number: AA6352. (On Time performance: 65 - Average Delay: 63 minutes)
GoJet Airlines
- Flight Number: G74517.
United Airlines
- Flight Number: UA1008. (On Time performance: 89 - Average Delay: 7 minutes)
- Flight Number: UA1382. (On Time performance: 69 - Average Delay: 21 minutes)
- Flight Number: UA1639. (On Time performance: 61 - Average Delay: 58 minutes)
- Flight Number: UA2805. (On Time performance: 86 - Average Delay: 6 minutes)
- Flight Number: UA4165. (On Time performance: 77 - Average Delay: 13 minutes)
- Flight Number: UA4183. (On Time performance: 93 - Average Delay: 6 minutes)
- Flight Number: UA4395. (On Time performance: 77 - Average Delay: 40 minutes)
- Flight Number: UA4411. (On Time performance: 59 - Average Delay: 31 minutes)
- Flight Number: UA4423. (On Time performance: 90 - Average Delay: 8 minutes)
- Flight Number: UA4452. (On Time performance: 50 - Average Delay: 47 minutes)
- Flight Number: UA4517. (On Time performance: 84 - Average Delay: 8 minutes)
- Flight Number: UA4536. (On Time performance: 63 - Average Delay: 45 minutes)
- Flight Number: UA4567. (On Time performance: 95 - Average Delay: 3 minutes)
- Flight Number: UA5572. (On Time performance: 69 - Average Delay: 27 minutes)
Punctuality and delays
It is not possible to calculate the On-Time Performance for this flight accurately due to insufficient or non-representative data, as doing so could lead to misleading conclusions.
Delays analyzed by Week: It is not possible to calculate the On-Time Performance for this flight accurately by weekday due to insufficient or non-representative data, as doing so could lead to misleading conclusions
Delays analyzed by Month: We have gathered available data from last twelve closed months, spanning from July 02, 2025 to December 17, 2025. Next, you can observe the results broken down by month: number of flights analyzed, on-time performance per month, and average delay per month.
Delays analyzed by Week: It is not possible to calculate the On-Time Performance for this flight accurately by weekday due to insufficient or non-representative data, as doing so could lead to misleading conclusions
Delays analyzed by Month: We have gathered available data from last twelve closed months, spanning from July 02, 2025 to December 17, 2025. Next, you can observe the results broken down by month: number of flights analyzed, on-time performance per month, and average delay per month.
Last Past Flights UA4399
No flights for UA4399 were scheduled in the past month. The last flight took place on Wednesday, December 17, 2025