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October 31 21%
Only Polymarket lists this market, so there is no second price to compare.
Consensus blends each venue’s last price, weighted by how much has traded there. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.
Prices come from our regular polls of each venue, the oldest 8 min ago. Ages are as of when this page was built.

The leading outcome on both venues, with the consensus between them. Hover for exact values.
Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.
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Enter a stake to see where it buys the most after fees, using each venue’s live order book.
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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.04 × price × (1 − price) per share (politics rate). Fee calculator. Estimates only, not advice.
Live prediction market odds for "Riyadh airport reopens (50+ departures) by...?". October 31 leads at 21%. $10K has traded across 1 outcome on Polymarket. The market is expected to resolve by Nov 1, 2026.
This market will resolve to "Yes" if at least 50 flights depart from Riyadh's King Khalid International Airport (RUH) within a single calendar day in Riyadh local time (Arabia Standard Time, AST), between the date of market creation and the specified date. Otherwise, this market will resolve to "No". Departures will be evaluated as displayed by FlightAware on its King Khalid Int'l Airport (Riyadh) RUH airport page (https://www.flightaware.com/live/airport/OERK) and the corresponding departures page (https://www.flightaware.com/live/airport/OERK/departures). Only confirmed departures, displayed with an actual departure time, qualify; scheduled departures do not qualify. Only departures occurring after market creation will count. All departures displayed by FlightAware count toward the threshold, regardless of airline, destination, or flight type. Obviously erroneous departures will not count toward the threshold, whether or not FlightAware corrects them. A departure is obviously erroneous if FlightAware's own flight data (e.g., its flight map, track, or track log) shows that the aircraft did not take off from RUH, such as a flight shown departing RUH based on its scheduled routing while its track originates at a different airport. Multiple listings of the same physical departure (e.g., codeshare flight numbers) will count as a single departure. A discrepancy between FlightAware and alternative sources will not, on its own, make a departure erroneous. If the resolution of this market depends on whether one or more departures are erroneous, this market may remain open until the end of the third calendar day (AST) after the date of the relevant departures to allow FlightAware to correct its data. If FlightAware has not corrected its data by then, this market will resolve based on the data FlightAware displays at that time, excluding any obviously erroneous departures as described above. Announcements, NOTAMs, airline schedules, or reports that the airport has reopened will not qualify on their own if FlightAware does not display at least 50 departures within a single calendar day (AST). The resolution source for this market will be information from FlightAware (https://www.flightaware.com/live/airport/OERK).
It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.
A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.
Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.
Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.
Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.