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Will your upgrade clear?
Pick the airline, your status tier, fare class, and the route. We'll estimate the odds your complimentary or mileage upgrade clears — and tell you exactly which factors are working for and against you. Built from public Delta, United, American, and Alaska upgrade policy.
How we calculate this
This is a documented heuristic, not an ML prediction. The number you see is the sum of five published carrier-policy levers — status tier, fare class, route premium-ness, time-to-departure, and holiday surge — combined with a per-airline base clearance rate. None of it depends on us knowing you or your flight.
Status is the biggest lever
Every major US carrier lists status first in its upgrade priority order. Delta's published order is medallion tier, then ticket revenue, then booking class, then Million Miler status. United orders by Premier tier, then fare class, then Premier qualifying points. American orders by status, then their Executive Platinum clearance benefit, then ticket revenue. Alaska is the most generous of the four, with a published complimentary upgrade clearance rate that often exceeds 60% even at the MVP Gold tier on standard routes.
Fare class controls eligibility, not just position
Basic Economy fares are ineligible for complimentary upgrades on Delta, United, and American — period. Buying Main Cabin is the first dollar that buys you any chance of an upgrade. From there, paid Comfort+, Extra Comfort, and Premium Economy passengers sit higher than Main Cabin elites of the same tier on most carriers' upgrade list. Upgrading from Business to First is structurally rarer than Y → J because the F cabin is physically smaller and the list of eligible J passengers is long.
Route premium-ness sets the competition level
The transcontinental business routes (JFK-LAX, JFK-SFO, EWR-SFO, BOS-LAX) and the flagship international business routes (JFK-LHR, ORD-LHR, SFO-NRT, LAX-HND) are where every elite on the seaboard wants to sit in front. Even Diamond and 1K clearance is uneven. By contrast, leisure routes — anywhere to MCO, LAS, CUN, NAS, OGG — see far fewer elites buying revenue tickets, so the upgrade list is short and clearance is high.
Time to departure: most upgrades clear inside the last 72 hours
Delta and United both run automated complimentary upgrade processing windows that start at booking and continue right up to the gate. The reality on most carriers is that the heaviest churn happens in the last 72 hours — paid revenue cancellations, no-shows, operational re-accommodations, and crew-rest swaps all free up inventory. If you're checking 28 days out and the waitlist is 24-deep, that number routinely shrinks to single digits by T-12h.
Holiday surge: Thanksgiving, July 4, and the last week of December
On the Wednesday before Thanksgiving, the Sunday after, July 3, and the Christmas travel days, revenue-ticketed elites stack much deeper than average. Loads run at 100%, premium cabins sell more aggressively, and the upgrade list barely moves. If you're flying these days, plan to fly in the cabin you bought.
What we don't model
We don't model fleet type swaps, weather rebooking ripple effects, or last-minute inventory drops from a corporate contract going unused. Those are exactly the variables an active monitor can catch live — which is what MileIntel does when you sign in. The heuristic on this page is calibrated to be a reasonable expectations-setter, not a substitute for a real-time read.
Frequently asked questions
How accurate is an upgrade probability estimate?
Real clearance depends on the actual upgrade list and premium-cabin inventory at flight time, which only the airline sees in full. Our number is a defensible heuristic built from public carrier policy — status tier weighting, fare-class eligibility, route premium-ness, time-to-departure, and holiday surge. Use it to set expectations, not to bet on. Sign in to monitor a specific flight if you want a live read.
What's the single biggest factor in whether my upgrade clears?
Status tier, on every major US carrier. Delta lists 'medallion tier' first in its upgrade priority order; United and American do the same. The next-biggest lever is fare class — Basic Economy is ineligible on DL, UA, and AA, and full Y/B fares get prioritized inside your tier band.
Why is my upgrade probability so low on JFK-LAX?
JFK-LAX, JFK-SFO, EWR-SFO, BOS-LAX and the major international business routes (JFK-LHR, ORD-LHR, SFO-NRT) are the most elite-saturated routes in the system. Every Platinum, Diamond, 1K, and Executive Platinum on the East and West coasts is fighting for the same 16-20 paid business seats. Mid-tier elites rarely clear without a buy-up.
Does buying Comfort+ or Premium Economy help my upgrade odds?
Yes, marginally. Paid premium-economy passengers sit higher than Main Cabin elites of the same tier on most carriers' upgrade list. It also doubles as a hedge — even if the upgrade doesn't clear, you have a better seat than Main.
Why does Southwest always return zero?
Southwest is a single-cabin airline with no upgrade product. A-List status improves your boarding position (and therefore your seat selection), but there is no operational upgrade to clear into.