How online check-in works
Online check-in is the same idea on every airline — confirm you're flying, allocate a seat, generate a boarding pass — but the timing, costs, and data requirements vary widely. Here's the universal mental model.
The universal model
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Check-in window opens
Most airlines: 24 hours before departure. Low-cost: 24–48 hours, sometimes more if you've paid for seat selection. Full-service long-haul: 23–30 hours, sometimes 60 days for Premium and Business.
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You enter passenger data
Passport / ID, expiry date, country of issue. Mandatory for international flights and for any flight to the United States (Secure Flight rules).
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Seat is allocated (free or paid)
Random allocation in the 24-hour window is free on most carriers. Specific seats cost €4–€25 depending on row. Front rows and exit rows are most expensive.
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Boarding pass is generated
Always save to Apple Wallet / Google Wallet — the boarding pass auto-updates if your gate changes and works offline. Print as backup if you're worried about your phone battery.
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Check-in window closes
Online: typically 60 minutes before departure (full-service) or 2–3 hours before (low-cost). After this window, only airport check-in is possible — and on low-cost airlines that costs €40–€55.
Why airlines push online check-in so hard
- Cost. Each airport check-in counter staffed handles ~30 passengers/hour at €0.40/passenger marginal cost. Online it's ~€0.001.
- Pre-clearance. Government secure-flight checks complete before you arrive at the airport, smoothing security.
- Yield management. Knowing exactly who's flying lets airlines confidently overbook (and yes, fewer no-shows = more denied boardings).
- Data. Email + phone + sometimes passport gives airlines a marketing channel they didn't have before.
Mobile vs desktop — which to use?
| Feature | Mobile (app) | Desktop |
|---|---|---|
| Apple/Google Wallet | Yes (recommended) | Email link only |
| Passport scan | Yes (camera OCR) | Manual entry |
| Push gate updates | Yes | No |
| Multi-passenger group | Possible but fiddly | Easier |
| Offline access | Yes (after download) | No |
| Best for | Day-of-travel use | Group bookings, troubleshooting |
Common pitfalls
- Screenshot of boarding pass. Some airlines reject screenshots — only the live in-app pass or print is valid. Ryanair is the strictest.
- Visa data missed. Online check-in for non-EU destinations often blocks until visa info is added. Check 24h before.
- App-only boarding. Some carriers (Ryanair, easyJet, Wizz Air) penalize you €30–€55 for printing at the airport. Save to Wallet always.
- Multi-leg connections. Codeshare flights need check-in via the operating airline (not the marketing airline). Look at the small print on your booking.
- Group bookings. Each passenger needs their own passport entry. Have all docs ready before starting.
When to use airport check-in instead
- Special-assistance passengers (mobility, unaccompanied minor).
- Pet in cabin requiring documentation review.
- Oversized / sports baggage that won't fit drop-off limits.
- Group bookings of 10+ passengers (some airlines require counter check-in).
- You hold a paper ticket (rare today, but happens with award redemptions).