This page goes deeper on one part of the policy. The full record is at Spirit Airlines Baggage Rules.
Spirit Airlines shut down on May 2, 2026. There is no current Spirit personal item size to look up, because Spirit is not flying, selling tickets, or publishing baggage rules anymore.
The old Spirit personal bag dimensions were 18 x 14 x 8 inches, or 45 x 35 x 20 cm. That box stopped mattering to Spirit the day the airline stopped flying.
Most people searching for Spirit personal bag dimensions want one of two things. Either what fits under a seat on an airline that still operates, or whether an old bag bought for Spirit still works. Both answers exist, just not on Spirit’s own site.
Where the old Spirit personal item number went
The 18 x 14 x 8 inch box was Spirit’s free personal item allowance on every fare it sold. That exact figure now shows up on two carriers that happen to use the same measurement.
Frontier Airlines lists an 18 x 14 x 8 inch personal item. Its Frontier Airlines baggage rules and Frontier carry-on size chart are current and verified.
Allegiant Air also publishes the same 18 x 14 x 8 inch box. Its Allegiant carry-on size page reflects what the airline allows today.
A bag bought for Spirit still works, mostly
If a personal item was sized for Spirit’s old box, it will also clear Frontier and Allegiant. Both run the identical 18 x 14 x 8 inch limit.
It will not automatically clear every other airline. Personal item boxes vary by a few inches from carrier to carrier.
- Check the bag against the new carrier’s personal item box before flying, rather than trusting old Spirit personal bag dimensions on a different airline.
- Use the carry-on size checker to compare the bag against a current airline’s limit in seconds.
- Read the personal item versus carry-on guide if the bag also needs to work as a carry-on.
Refunds for an unused Spirit ticket
Spirit’s old personal item and carry-on figures do not need checking anymore. An unused ticket or a stuck credit might still need attention.
The Department of Transportation’s airline refunds page covers when a refund is owed. It also covers credit card chargebacks for cases where the airline itself can no longer pay.
Anyone with a Spirit voucher, an open claim, or a bag Spirit lost before the shutdown should start there. Spirit’s own site no longer has a working baggage desk or a current personal item box.
The bottom line
The Spirit personal bag dimensions everyone remembers, 18 x 14 x 8 inches, still matter for one reason. Frontier and Allegiant happen to use the same box, so a bag sized for old Spirit flights fits both without changes.
For anything owed on an old Spirit ticket, the DOT refunds page is the accurate next stop, not Spirit’s own site.
Common questions
What are the Spirit personal bag dimensions
Spirit’s old personal item box was 18 x 14 x 8 inches, or 45 x 35 x 20 cm, but Spirit stopped flying on May 2, 2026, so the size no longer applies to any active flight.
Is Spirit Airlines still operating
No. Spirit Airlines ceased operations on May 2, 2026 and is not selling tickets, checking bags, or running flights.
Which airlines use the same personal item size as Spirit did
Frontier Airlines and Allegiant Air both publish an 18 x 14 x 8 inch personal item box, the same figure Spirit used to allow.
How do I get a refund for an unused Spirit ticket
The Department of Transportation’s airline refunds page covers refund rights and credit card chargebacks for tickets an airline can no longer honor.
Will a bag bought for Spirit fit on Frontier or Allegiant
Yes, since both carriers use the identical 18 x 14 x 8 inch personal item limit Spirit used.
Who do I contact about a bag Spirit lost before it shut down
Spirit no longer operates a baggage desk, so a DOT complaint or a credit card chargeback are the remaining routes for an unresolved claim.
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