Per Diem Rules When a Flight Is Delayed Overnight
Per diem flight delay rules change when a business trip extends an extra night because of airline disruption. GSA per diem does not automatically extend; corporate policies vary; the airline may reimburse some costs under EU261 Article 9 or DOT guidance. Here is who pays for what.
Per Diem Flight Delay: Who Pays What
Per diem flight delay math has three possible payers: the airline (EU261 Article 9 care or US DOT care guidance), your employer (corporate travel policy), and your own insurance / credit card trip-delay benefit. Each fills a different gap. The order you file in determines how much you end up out of pocket after the trip.
Airline first, employer second, insurance last. Most corporate policies explicitly state that the airline's care obligations come first and the employer only reimburses the uncovered gap.
GSA Per Diem and Unscheduled Extensions
US federal travelers on GSA per diem typically have an automatic lodging + M&IE rate for each scheduled travel day. An unscheduled overnight from a cancelled flight does not extend the per diem automatically. You must request an amendment to the travel authorization through your agency's system (typically within 30 days of trip end).
Corporate Per Diem Defaults
- ›
Policy extension: most policies extend per diem automatically when a delay extends the trip by operational necessity.
- ›
Actuals vs per diem: some policies switch to actuals (reimburse receipts) for unplanned nights.
- ›
Cap per night: common $200-$300 lodging cap for major cities, less for smaller markets.
- ›
Meal cap: typically $50-$75 M&IE equivalent, higher for premium markets.
- ›
Ground transport: usually reimbursed separately at actuals.
See business travel disruptions 2026 guide for the broader policy landscape and travel management companies and compensation claims for TMC-handled reimbursement.
EU261 Article 9 Care Obligations
On EU-departing or EU-carrier-arriving flights, EU261 Article 9 obligates the airline to provide: meals and refreshments proportionate to waiting time, hotel if overnight stay is needed, ground transport between airport and hotel, and 2 phone calls. If the airline does not provide, buy the reasonable equivalent and claim reimbursement.
EU261 care is not capped in euros. The airline must provide what is reasonable given the circumstances. A $340 airport hotel in Paris is reasonable; a $900 suite is not.
Documenting for Dual Payers
- 1
Save the boarding pass and any airline communication (cancel text, rebook confirmation).
- 2
Save the hotel receipt with your name, date range, and total.
- 3
Save meal receipts above $15.
- 4
Save ground transport (Uber / Lyft / taxi) receipts.
- 5
Photograph the empty airline service desk or the written refusal if the airline declined to provide care.
- 6
File the airline reimbursement request within 7 days.
- 7
File the corporate expense report within your policy window (typically 30 days).
See business trip delayed: documenting time loss for the full documentation protocol.
When the Airline and Employer Both Pay
If the airline reimburses your hotel and your employer also pays per diem for that night, the double payment typically belongs to the employer. Most corporate policies explicitly state that airline reimbursements are credited against the travel expense, not kept by the traveler. Failure to disclose is usually an expense-policy violation; always flag airline reimbursements to your expense administrator.
Pillar Link and Authority Sources
See the full pillar at Business Travel Flight Disruption Compensation. Primary sources: GSA Per Diem Rates, Federal Travel Regulation 41 CFR 301, and Regulation (EC) 261/2004.
TravelStacks files the airline side: DOT refund at a $19 flat fee, EU261/UK261 at 25 percent. Start a claim in 30 seconds.