When United MileagePlus award seats become bookable
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United MileagePlus lists a published booking window of about 337 days (about 11 months) before departure, so a date's award space usually appears around then. The furthest open departure AwardTool observed in the last 30 days was Sep 20, 2027, 337 days after Oct 18, 2026.
Observed – .
Page regenerated from the Oct 19, 2026 data snapshot (normally daily). Observations last changed . The booking window is published by the program; the open departures are observed.
MileagePlus booking window at a glance
- Published booking window
- 337 days (about 11 months)
- Source
- AwardTool's transfer partner data
- Window last reviewed
- Aug 27, 2026
- Release time of day
- Not published; release times vary by program and are not in this data
- Furthest open departure observed
- Sep 20, 2027, 337 days after Oct 18, 2026
When upcoming departure dates become bookable
Under MileagePlus's published window of 337 days (about 11 months), a departure becomes searchable about that many days before it. These dates are computed from the window, not observed.
| Departure date | Becomes bookable around |
|---|---|
| Jul 1, 2027 | Within the booking window now |
| Aug 1, 2027 | Within the booking window now |
| Sep 1, 2027 | Within the booking window now |
| Oct 1, 2027 | Oct 29, 2026 |
| Nov 1, 2027 | Nov 29, 2026 |
| Dec 1, 2027 | Dec 29, 2026 |
| Jan 1, 2028 | Jan 29, 2027 |
| Feb 1, 2028 | Mar 1, 2027 |
| Mar 1, 2028 | Mar 30, 2027 |
| Apr 1, 2028 | Apr 30, 2027 |
| May 1, 2028 | May 30, 2027 |
| Jun 1, 2028 | Jun 30, 2027 |
Computed as the departure date minus the published window, from Oct 18, 2026. It is the earliest the published rule would open a date; actual release can run earlier or later, and a date shown as open now may have sold its seats. AwardTool's observations in the last 30 days are below.
MileagePlus awards vs the airline that flies you
MileagePlus is the program you book with; the award itinerary is flown by MileagePlus's own airlines or its partners, who release seats on their own schedules. Below, the furthest open departure AwardTool observed in the last 30 days on MileagePlus award results that showed a single airline.
| Airline (marketing carrier) | Furthest open departure observed | Single-airline results |
|---|---|---|
| United Airlines (UA) | Sep 20, 2027337 days out | 4,612 |
| Singapore Airlines (SQ) | Sep 20, 2027337 days out | 83 |
| Azul Brazilian Airlines (AD) | Sep 18, 2027335 days out | 230 |
| ANA (NH) | Sep 18, 2027335 days out | 38 |
| EVA Air (BR) | Sep 18, 2027335 days out | 36 |
| Air India (AI) | Sep 16, 2027333 days out | 488 |
| South African Airways (SA) | Sep 13, 2027330 days out | 12 |
| Virgin Australia (VA) | Sep 12, 2027329 days out | 52 |
The airline is the marketing carrier, the one that sells the seat; another airline may operate the flight. Partner airlines often release award space later than the program's own flights.
Initial release and later availability
Many programs load an initial batch of award seats when their booking window opens, then add or remove space as departure nears. So a MileagePlus date that shows nothing the day it opens can gain award space later, and space seen today can disappear.
Business- and first-class award space, and partner-airline space, often appear later and in smaller amounts than economy on the program's own flights.
What AwardTool has observed for MileagePlus
On Oct 18, 2026, the furthest open MileagePlus departure AwardTool had observed in the last 30 days was Sep 20, 2027, 337 days out, across 16,820 routes. That is within two weeks of the 337 days published window. AwardTool scans departures up to 365 days ahead, so a window longer than that cannot be observed in full.
Questions about MileagePlus award release dates
When do MileagePlus award seats become bookable?
United MileagePlus publishes a booking window of about 337 days (about 11 months) before departure, so award space for a date usually appears around then and is added or removed as the date nears. For a departure on Oct 1, 2027, that points to around Oct 29, 2026.
How far ahead has AwardTool seen open MileagePlus award space?
In the last 30 days, the furthest open MileagePlus departure AwardTool observed was Sep 20, 2027, 337 days out, across 16,820 routes with award space on two or more dates.
Can I book partner airlines with MileagePlus?
MileagePlus award results AwardTool observed showed single airlines including United Airlines, Singapore Airlines, Azul Brazilian Airlines, ANA, EVA Air, Air India, South African Airways, Virgin Australia. Each releases award space on its own schedule, and partner space often opens later than the program's own flights, so the furthest bookable date differs by airline.