United Delivery Service, commonly known as UDS, is a United States regional parcel and courier company with more than five decades of experience. The company began in the Chicago metropolitan area and has developed a network of facilities supporting residential and business deliveries, with a strong focus on last-mile transportation and regional distribution.
UDS provides same-day, next-day, freight, on-demand, routed, and customized delivery solutions. Its services are used by retailers and e-commerce businesses as well as companies shipping automotive products, groceries, meal kits, office supplies, pharmaceuticals, medical supplies, cosmetics, payroll items, and other time-sensitive goods.
The carrier describes itself as a Midwest regional parcel provider and operates a network of facilities supporting sorting, same-day and next-day transportation, routed delivery, and freight handling. Its official website currently reports 15 locations and approximately 150,000 packages handled per day, while individual facilities provide different combinations of parcel sorting, dock access, scheduled routes, and local delivery services.
Technology is an important part of the UDS delivery process. The company provides end-to-end status updates, real-time Tracking and estimated arrival information, text-message delivery notifications, and Visual Proof of Delivery showing where a package was left. These tools allow recipients and merchants to follow package tracking information as shipments move through the UDS network.
How to track United Delivery Service packages
You can Track a United Delivery Service package on 4Tracking by entering the shipment number in the tracking field. 4Tracking can automatically detect supported carriers when possible; if necessary, select United Delivery Service manually, click the Track button, and you will be redirected to the results page showing the latest available package tracking events.
UDS also provides an official Track a Package service. Its tracking field accepts a Tracking Number, Barcode, Delivery Notice Number, or Order Reference Number. If a driver left a missed-delivery notice, UDS instructs recipients to use the delivery notice number shown on that notice to retrieve the shipment information.
Common UDS Tracking statuses include Shipment Notification, Received, Out for Delivery, Delayed, Will-Call, Returned, and Delivered. Shipment Notification means a shipping label has been created but the package has not yet reached a UDS facility, while Out for Delivery means the package has left the warehouse with the delivery process underway.
United Delivery Service tracking number formats
United Delivery Service does not publish a single fixed character format for all tracking numbers. The official tracking system accepts several types of shipment identifiers, including a tracking number, barcode, delivery notice number, and order reference number, so it would be inaccurate to assign one universal prefix, length, or letter-and-digit pattern to every UDS package.
For reliable package tracking, enter the complete reference exactly as supplied by the retailer, sender, shipping label, or UDS delivery notice. Do not remove leading zeros, letters, or other characters simply to make the number resemble another carrier's format.
UDS states that tracking information remains available online for 30 days. If the Tracking page returns a Barcode Not Found message for an older shipment, its tracking history may already have expired. For a recent shipment, UDS recommends contacting the shipping merchant to verify the number.
United Delivery Service delivery times and examples
UDS offers several delivery speeds rather than one universal transit time. Its official services include same-day and next-day delivery, while freight, scheduled routes, customized distribution, and other services can follow different timelines. The company specifically promotes next-day delivery within its regional parcel network and same-day service for shipments requiring faster transportation.
For example, UDS facilities in Chicago, Waukegan, Aurora, Fort Wayne, Indianapolis, Milwaukee, Madison, Green Bay, and other network locations support same-day and next-day delivery services. Time-critical healthcare services also include same-day, next-day, scheduled route, and on-demand STAT delivery options.
For a package already marked Out for Delivery, UDS states that residential deliveries are normally serviced Monday through Friday between 8:00 a.m. and 8:00 p.m., sometimes later. Business deliveries are generally made during normal business hours, and packages may occasionally be delivered during the weekend. These delivery hours describe the final delivery stage rather than the total transit time from the sender.
The delivery day and time for an individual shipment are generally established by the merchant and cannot be changed directly by UDS. Recipients should therefore use the merchant's delivery expectation together with the latest Tracking status and any ETA shown for the package.
How to contact United Delivery Service about shipment issues
United Delivery Service directs recipients with package problems to the customer-support option available through its Track a Package page. The company's customer portal also publishes 630-930-5201 as its Customer Assistance number. For general company questions, UDS lists info@UnitedDeliveryService.com, while sales@uniteddeliveryservice.com is provided for shipping-service and sales inquiries.
The UDS headquarters is located at 1 S 376 Summit Ave #1F, Oakbrook Terrace, Illinois 60181, United States. When requesting assistance with a package, provide the complete tracking number or other shipment reference, recipient address, merchant name, and latest Tracking status.
If your problem involves cancelling an order or changing the planned delivery day or time, contact the merchant that shipped the package. UDS states that order cancellations must be handled by the merchant and that delivery days and times are established by the merchant rather than changed directly by UDS.
Frequently asked questions about United Delivery Service package tracking issues
Can I Track a United Delivery Service package with 4Tracking?
Yes. Enter the shipment reference on 4Tracking, allow the system to identify the carrier when possible, or select United Delivery Service manually, then click Track to view the available package tracking events.
What can I enter on the UDS tracking page?
United Delivery Service states that its official Tracking service accepts a Tracking Number, Barcode, Delivery Notice Number, or Order Reference Number. Use the complete reference exactly as it appears on your shipment information.
What format does a United Delivery Service tracking number use?
UDS does not publish one universal tracking-number structure covering every shipment. Because its tracking system accepts several types of references, use the number supplied by the sender rather than relying on an assumed prefix or fixed number of digits.
What does Shipment Notification mean in UDS Tracking?
Shipment Notification means a label has been created for the package but the parcel has not yet arrived at a UDS facility. Additional Tracking events should appear after UDS physically receives and processes the shipment.
What does Out for Delivery mean?
Out for Delivery means your package has left the UDS warehouse and is on its way to the delivery address. UDS normally services residential deliveries Monday through Friday between 8:00 a.m. and 8:00 p.m., although deliveries can sometimes occur later or on weekends.
Why does UDS Tracking say Barcode Not Found?
UDS states that online tracking information is available for only 30 days. If the shipment is older, its information may no longer be available. If the tracking number is recent, contact the merchant to verify that the reference is correct.
How long does United Delivery Service delivery take?
The timeframe depends on the service selected by the sender. UDS offers same-day and next-day delivery as well as freight, scheduled, routed, and customized services. Use the expected delivery information supplied by the merchant and the latest Tracking events for your specific package.
Can I change my UDS delivery date or time?
UDS states that delivery days and times are set by the merchant and cannot be changed directly by UDS. Contact the retailer or sender if you need to request a different delivery arrangement.
What should I do if UDS says delivered but I cannot find my package?
UDS recommends checking less obvious or protected delivery locations such as a back porch, bushes, garage, side door, or another place out of sight, and asking neighbors or other people who may have accepted the parcel. If it is still missing, contact the UDS customer-support team through the Track a Package page.
How can I contact United Delivery Service about a delayed package?
Use the support option on the official Track a Package page or call the published Customer Assistance number at 630-930-5201. Have your tracking number, delivery address, merchant information, and latest package tracking status ready when requesting help.
Monthly Delivery Performance for United Delivery Service – August 2026
Our comprehensive monthly delivery report for United Delivery Service in August 2026 is based exclusively on shipments confirmed as delivered, detailing the fastest, average, and slowest transit times from origin to destination. Shipments still in transit are excluded to ensure accurate and reliable insights.
| From | To | Delivery Time |
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 UnknownUnknown | Unknown Unknown |
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