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Will Iran impose a full closure of its national airspace by 31 August 2026?

Resolution: Updated:
36%

market consensus

chance the market gives this event — not your chance of being right

Yes — The event happens
36%
No — The event does not happen
64%

Trade this contract

Open on PolymarketYes 0.36
  • gas covered
  • no trading fee
Buy the opposite sideNo 0.65

In short

The market treats a full closure as more likely not to happen than to happen, though it is far from ruled out. Pricing collapsed from the high 90s to roughly a third within a day of the market opening, suggesting an initial spike tied to acute tension has not been followed by an actual closure notice. A new military strike or a formal Iranian Civil Aviation Authority notice would be the trigger that flips this quickly.

How the contract works

A contract on this question settles at $1 if Iran's government initiates a general closure of the Tehran FIR to essentially all commercial flights for reasons other than weather before 31 August 2026 23:59 ET, and settles at nothing if no such closure occurs by that deadline. The price at any moment is simply what buyers and sellers currently agree the chance is: a contract trading at 0.30, for example, would imply the market sees this as happening roughly three times in ten, not as a prediction of certainty in either direction. A position taken today does not have to be held to settlement; it can be sold at whatever price the market is quoting at the time.
What the market thinks happens
$100
Yes36%

The event happens

Costs now
$0.36
If you put in $100
$278
No64%

The event does not happen

Costs now
$0.64
If you put in $100
$156

Probability

0%25%50%75%100%12:0017:3623:1204:4810:2416:00
ConsensusPolymarket

How the price has moved

The market opened on 29 July 2026 at 93%, a price consistent with launch during a period of acute tension when a closure looked close to certain. It then fell sharply, trading as low as 61% within the recorded range before continuing down toward its current mid-30s level, a decline of roughly 60 percentage points in about a day. The last 24 hours show a modest 3-point recovery, suggesting some stabilization, but the overall move still reads as a market correcting an initial overreaction rather than tracking a steady news drip; no single publicly reported event explains the day-to-day increments within that decline.

Context

The question asks whether Iran's government will order a general closure of the Tehran Flight Information Region (FIR) to essentially all commercial air traffic before 31 August 2026, for reasons other than weather. This is not a hypothetical scenario: Iran did exactly this in June 2025, closing its airspace for the duration of its 12-day conflict with Israel, forcing global carriers to reroute flights around the Persian Gulf and adding hours to routes between Europe and Asia. That episode is the direct precedent behind this market. The resolution bar is specific. Partial or regional restrictions do not count as a Yes. But a closure that carries narrow exemptions, such as pre-approved government or military flights, still qualifies, so the market is not waiting for an absolute, zero-exception shutdown. Settlement rests on flight-tracking data from Flightradar24 and reporting from Reuters and Iran International describing an actual Civil Aviation Authority notice, not just reduced traffic or airline caution. The market itself is new. It was first recorded on 29 July 2026, one day before this page was written, which means its price history is short and reflects a fast-moving situation rather than a settled consensus built up over weeks.

Analysis

The most striking feature of this market is not its current level but how far and how fast it has moved. It opened on 29 July 2026 at 93%, a price that implies the trader base at launch saw a closure as almost certain, consistent with a market created in the middle of an acute flashpoint. Within roughly a day it fell into the mid-30s, a drop of nearly 60 percentage points, before edging up 3 points in the most recent 24 hours. That trajectory is the signature of a market pricing in an imminent event that then failed to materialize on schedule, followed by a partial reassessment as the underlying tension persists without resolving either way. The recorded range since the market opened, 61% to 97%, sits above where the price now trades, which tells a reader that the recent slide below that band happened quickly and outside the earlier trading pattern. With only 87 price observations recorded so far, this is a thin history; each new data point can still move the consensus meaningfully, which is consistent with a single-venue market carrying $814,086 in total volume. That is a real amount of capital for a niche geopolitical contract, but it is small enough that the price can swing sharply on a handful of large trades or a single piece of news. The structural driver behind any future move is straightforward: Iran has closed its airspace before, in June 2025, under conditions of direct conflict with Israel, so the market is not pricing an unprecedented act. What determines the outcome between now and 31 August 2026 is whether a comparable trigger, a strike, a retaliation, or a diplomatic breakdown, recurs before the deadline. Absent that, the passage of time itself pushes the probability down, since each week without a notice from Iran's Civil Aviation Authority mechanically shortens the window in which a Yes can still occur.

What moves the probability

  • Precedent from June 2025

    Iran closed its airspace for the full duration of its 12-day war with Israel in June 2025, so the market is pricing a known behavior rather than an untested one. Any comparable military escalation before 31 August 2026 would push the probability up quickly, given that direct precedent.

  • No confirmed notice yet

    No Civil Aviation Authority closure notice has been reported by Flightradar24, Reuters, or Iran International since the market opened on 29 July 2026. That absence is the main reason the price fell from 93% to roughly a third within a day.

  • Shrinking time window

    With the resolution deadline fixed at 31 August 2026 23:59 ET, each week that passes without a new flashpoint mechanically reduces the number of days left for a closure to occur, pulling the probability down independent of any new news.

  • Thin, single-venue liquidity

    All $814,086 in recorded volume sits on one venue, Polymarket, with only 87 price observations so far. That thinness explains why the range since launch spans 61% to 97%, a swing a deeper, multi-venue market would likely dampen.

  • Low bar for what counts as closure

    The rules count a closure with narrow, pre-approved exemptions as a Yes, not just an absolute shutdown with zero exceptions. That keeps the probability from collapsing toward zero even without a full war footing, since a partial-exemption notice would still qualify.

The case for

  • A renewed exchange of strikes between Israel or the United States and Iran before 31 August 2026 would likely prompt Tehran to close the Tehran FIR, as it did during the June 2025 conflict.
  • A breakdown in nuclear negotiations or a fresh sanctions escalation could push Iran toward a defensive aviation measure even without an active strike.
  • Because narrow exemptions still count as a Yes, Iran does not need to ground every flight with zero exceptions for the market to resolve in favor of closure.
  • A single credible Reuters or Iran International report citing a Civil Aviation Authority notice would be sufficient to trigger resolution, regardless of how long the closure lasts.

The case against

  • No verified Civil Aviation Authority notice of a general closure has been reported since the market opened on 29 July 2026, despite the initial 93% pricing.
  • The price fell by roughly 60 percentage points within about a day, which suggests the acute trigger behind the launch-day spike did not turn into an actual closure.
  • With one month left before the 31 August 2026 deadline and no reported new hostilities, the passage of time works against a Yes outcome absent a fresh flashpoint.
  • Iran has strong incentives to keep its airspace open for revenue and diplomatic reasons outside of active conflict, as shown by its return to normal operations after the June 2025 war ended.

Trade this contract

Venues (1)

Open on PolymarketYes 0.36
  • gas covered
  • no trading fee

Venues (1)

Probability

  • Iran full airspace closure by August 31?36%
  • Iran full airspace closure by August 15?23%
  • Iran full airspace closure by July 31?3%

Resolution rules

Determined by
Polymarket market resolution criteria, citing flight-tracking data (Flightradar24) and news reports such as Reuters and Iran International on Iranian Civil Aviation Authority notices.
Resolution date

The market resolves Yes if Iran's government initiates a general closure of the Tehran Flight Information Region applicable to essentially all commercial flights, for reasons other than weather, before 31 August 2026 23:59 ET. A closure that includes narrow exemptions, such as pre-approved flights, still counts as Yes; partial or regional restrictions do not. Resolution is determined by Polymarket citing Flightradar24 flight-tracking data and news reports from Reuters and Iran International describing an actual Civil Aviation Authority notice. If no such closure has occurred by the deadline, the market resolves No.

Calculation methodology →

Local context

A full Iranian airspace shutdown would force airlines connecting Europe and Asia to reroute around the Persian Gulf, adding flight time and fuel costs on routes many Western carriers depend on, much as happened during the June 2025 closure. It would also be read by oil markets as a signal of imminent escalation near the Strait of Hormuz, a chokepoint for global crude shipments that investors in the US, UK, and elsewhere track closely for its effect on fuel prices and airline earnings.

What to watch

Between now and 31 August 2026 23:59 ET, the key signals are any Flightradar24 data showing mass rerouting around Iranian airspace, any Reuters or Iran International report of a Civil Aviation Authority notice, and any escalation in the broader Israel-Iran or US-Iran standoff, including strikes, retaliations, or a collapse of nuclear diplomacy. Absent a new flashpoint of that kind, the fixed deadline itself becomes the main factor, since time remaining for a closure to occur shrinks with every week that passes without one.

Common questions

What exactly settles this market, and when?
It settles based on Polymarket's resolution criteria, which cite Flightradar24 flight-tracking data and news reports from Reuters and Iran International describing an Iranian Civil Aviation Authority notice. The deadline is 31 August 2026 23:59 ET; if no general closure has occurred by then, it resolves No.
What does the price shown above actually mean?
It reflects what traders on Polymarket currently think the chance of a closure is, based on what they are willing to pay for a contract that pays $1 if it happens and nothing if it does not. It is a market estimate, not a forecast issued by any official body.
What if Iran closes only part of its airspace, or only for certain routes?
Partial or regional restrictions do not count under the resolution rules; the closure has to apply to essentially all commercial flights. A closure with narrow, pre-approved exemptions still counts as Yes, so the bar is a general shutdown, not a total one with zero exceptions.
Has Iran actually closed its airspace before?
Yes. During its 12-day conflict with Israel in June 2025, Iran closed its airspace to commercial traffic for the duration of the fighting, forcing global airlines to reroute around the region. That episode is the direct precedent this market is pricing against.
What happens if Iran closes its airspace after 31 August 2026?
It would not count. The resolution window is fixed at 31 August 2026 23:59 ET, so a closure announced after that date resolves the market No regardless of what happens later.
Can a position be exited before the market settles?
Yes. Contracts can generally be sold on the open market at the prevailing price at any point before the 31 August 2026 settlement, rather than being held to the deadline.

Related events

36%/ 65%
Yes / No
Open on Polymarket