How Long Does a Flight Have to Be Delayed for Compensation?

Under US DOT rules, a delay becomes a "significant change" that triggers your cash refund right when:

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  A domestic flight is delayed by 3 or more hours from its original departure time.

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  An international flight is delayed by 6 or more hours from its original departure time.

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  A connection causes you to arrive at your final destination 3 or more hours late (domestic) or 6 or more hours late (international).

These thresholds apply to the delay to your final destination, not just the first segment. If your first domestic segment is delayed 2 hours but causes you to miss a connection and arrive 4 hours late at your destination, the significant-change threshold is met.

DOT thresholds trigger a refund right, not automatic cash compensation. If you choose to travel despite the delay, you get to your destination and no refund applies. The cash refund right activates only if you choose not to travel on the significantly delayed flight.

Under EU Regulation 261/2004, a delay of 3 or more hours at the final destination triggers the right to fixed cash compensation of €250, €400, or €600, depending on flight distance. This is separate from and in addition to any refund right.

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  2+ hours: Duty of care rights (meals, phone calls, and for long delays, accommodation) apply for all passengers regardless of cause.

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  3+ hours arrival delay: Fixed compensation of €250–€600 per person applies if the airline cannot prove extraordinary circumstances.

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  Cancellation with less than 14 days notice: Same fixed compensation applies.

EU261 applies when your flight departed from an EU or UK airport, or when your flight arrived at an EU or UK airport and was operated by an EU carrier. For full coverage rules, see the EU261 guide. UK261 applies the same framework for flights departing UK airports.

For DOT purposes, the delay is measured from the original scheduled departure time to the actual departure (or arrival, for connection purposes). Gate changes, boarding delays, and ground holds all count.

For EU261 purposes, the delay is measured at arrival at the final destination, specifically when the aircraft doors open and passengers can disembark. A 3-hour departure delay that is partially recovered in flight may result in a 2.5-hour arrival delay, which falls below the EU261 compensation threshold.

Tarmac delays count. If your flight departs on time but sits on the tarmac for 3 hours before takeoff and then flies normally, the total delay from scheduled departure is counted. DOT also imposes a separate tarmac delay rule: domestic flights must return to the gate after 3 hours on the tarmac, and international flights after 4 hours.

The delay threshold determines eligibility; what you receive depends on the applicable regulation and what you choose to do.

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  US domestic, 3+ hour delay, you choose not to travel: Full cash refund to original payment method.

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  US domestic, 3+ hour delay, you travel: No automatic cash compensation under DOT (unlike EU261). Reimbursement for controllable expenses if the delay was the airline's fault.

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  EU261 qualifying 3+ hour delay: Fixed cash compensation of €250–€600 plus a refund right if you choose not to travel. Both can apply simultaneously.

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  Denied boarding (overbooking): Cash compensation of up to $1,550 under DOT, or €600 under EU261, regardless of delay length.

Beyond the standard delay thresholds, DOT has a dedicated tarmac delay rule. Airlines must return domestic flights to the gate within 3 hours of the door closing if the plane has not taken off. International flights have a 4-hour limit. Airlines that violate these limits face civil penalties.

The tarmac delay rule provides the right to deplane, but does not automatically trigger a cash compensation payment. However, a flight that results in a 3+ hour tarmac delay will typically also meet the significant-change threshold, making you eligible for a cash refund if you choose not to travel.

Q: My flight was delayed 2 hours and 50 minutes. Am I just below the DOT threshold?

For DOT refund purposes, yes. The threshold is 3 hours for domestic. However, if the delay caused you to miss a connection and arrive at your final destination 3 or more hours late, the significant-change threshold is met for the whole journey.

Q: Does EU261 require the flight to arrive late, or just depart late?

EU261 compensation is triggered by arrival delay at the final destination, not departure delay. A 3-hour departure delay partially recovered in flight may result in a 2.5-hour arrival delay, which is below the EU261 compensation threshold.

Q: If my delay is exactly 3 hours, does the rule apply?

Yes. The threshold is 3 or more hours, so exactly 3 hours qualifies. Under EU261, courts have interpreted a delay of 3 hours or more as meeting the standard, meaning an arrival at 3 hours 1 minute would qualify.

Q: My airline said the flight was only delayed 2 hours but I know it was longer. How do I prove the delay?

Flight tracking services like FlightAware and FlightRadar24 record actual departure and arrival times independently of the airline. You can screenshot these records as evidence. Your boarding pass with the gate time and any text messages from the airline also serve as documentation.

Q: Does a missed connection count as a delay even if each individual flight was on time?

If both flights were on the same booking and the airline scheduled a connection that was too tight to make, the resulting arrival delay at your final destination counts. The significant-change threshold is applied to the final destination arrival, not each individual segment.

Q: Is there a minimum delay for expense reimbursement (meals, hotel) under US DOT rules?

DOT does not mandate a specific hour threshold for expense reimbursement. Airlines that signed the DOT customer commitment pledge (which includes Delta, United, American, Southwest, JetBlue, Alaska, and others) have voluntarily committed to meal vouchers for controllable delays of 3 or more hours and hotel for controllable overnight delays.