✓ Policy web-verified 2026-06-20
On Allegiant’s cheapest fare — the Basic (the carrier’s old “Bare Fare”) — you get a seat and one free personal item that has to slide completely under the seat in front of you (8 x 14 x 18 in / 20 x 35 x 45 cm). That’s it. No carry-on for the overhead bin, no checked bag, not even a seat assignment unless you pay. Allegiant is an ultra-low-cost carrier and it prices like one: the headline fare is the floor, and everything above a backpack is an upsell.
And this doesn’t change by route. Allegiant flies point-to-point within the United States plus a handful of leisure destinations in Mexico — it has no long-haul or transatlantic network, so there’s no “international fare bundles a bag” exception the way you’d see on a WestJet transpacific ticket. US domestic or US–Mexico, the cheapest fare includes the under-seat item only. A real carry-on (10 x 16 x 22 in / 25 x 40 x 55 cm) and any checked bag are both paid extras, priced by route, date and when you buy. The golden rule: add bags during the original booking — wait until the airport and a carry-on jumps to a flat $75 per segment.
Quick facts
| Free personal item | 8 x 14 x 18 in (20 x 35 x 45 cm), under seat |
| Carry-on bag | 10 x 16 x 22 in (25 x 40 x 55 cm) — PAID |
| Carry-on fee | $10–$75 per segment (cheapest at booking) |
| Checked bag | Up to 50 lb (22 kg), 80 linear in (203 cm) |
| Checked fee | Varies by route/date; up to $75 at airport |
| Overweight 51–70 lb | +$50 per segment |
| Cheapest fare | Basic — personal item only, all routes |
| Best move | Add all bags at booking; airport carry-on = $75 |
Cabin bag & personal item
| Item | Allowance |
|---|---|
| Personal item (free) | 8 x 14 x 18 in (20 x 35 x 45 cm) — must fit fully under the seat. Included on every fare, even Basic. |
| Carry-on bag (paid) | 10 x 16 x 22 in (25 x 40 x 55 cm) — $10–$75 per segment; cheapest at booking, flat $75 at the gate. Free only if bundled in Bonus/Total. |
Checked baggage & fees
| Allowance | Up to 4 checked bags per passenger, all paid |
| Weight limit | 50 lb (22 kg) per bag at standard fee |
| Size limit | 80 linear in (203 cm) — height + width + length |
| Typical fee | Varies by route, date and channel; cheapest at booking |
| At the airport | Up to $75 each way, per bag |
| Overweight 51–70 lb | +$50 per segment |
| Overweight 71–100 lb | +$75 per segment |
| Oversize (>80 in) | +$75 per segment |
Baggage by region & route
Checked-bag inclusion on the cheapest fare can depend on where you fly, not just the fare name. Here is what the lowest fare includes by route:
| Route / region | Cheapest fare includes |
|---|---|
| US domestic | Personal item only — no checked bag |
| US–Mexico (leisure international) | Personal item only — no checked bag |
What each fare includes
| Fare | Personal | Cabin | Checked |
|---|---|---|---|
| Basic (Bare Fare) | Yes | No (paid) | No (paid) |
| Bonus | Yes | Carry-on OR checked (route-dependent) + seat | OR checked, route-dependent |
| Total | Yes | Carry-on + seat + priority + Trip Flex | Checked included |
What you actually get on a cheap fare
What you actually get on a cheap Allegiant deal fare: the Basic fare is a seat plus one under-seat personal item. No overhead carry-on, no checked bag, no seat selection. If you’re a weekender who can pack into a backpack, you fly for the deal price and owe nothing more — that’s exactly who Allegiant is built for, and there’s no long-haul route where a bag quietly comes free.
Need more? Budget for it at booking, not later. A carry-on runs $10–$75 per segment and a first checked bag is route-priced in a similar range — both cheapest added during the original booking and climbing the closer to departure you buy, up to a flat $75 each way at the airport. Two legs plus a bag can add $100+ to a “$49” headline fare. If you’ll want both a cabin bag and a checked bag plus a seat, price the Bonus or Total bundle against buying à la carte — bundles can only be added during the original booking and can’t be changed afterward, so decide upfront.
Oversize, sports & special items
Checked bags over 50 lb cost more per segment: +$50 for 51–70 lb and +$75 for 71–100 lb (bags can’t exceed 100 lb); anything past 80 linear inches is an oversize +$75. Most sporting equipment and instruments — bikes, golf clubs, skis, instrument cases — travel as checked baggage and are subject to those overweight/oversize charges if they exceed the limits. Mobility aids, assistive devices, car seats and strollers fly free and aren’t counted against your baggage.
2025/2026 note: Allegiant has moved to a three-tier Basic / Bonus / Total bundle structure, replacing the old standalone “Bare Fare” naming, though the cheapest option still includes only the free personal item. Bag fees remain dynamic — priced per route, date and purchase channel — so the published $10–$75 carry-on range and the route-priced checked-bag fee are the figures to trust over any single fixed number. Always add bags while booking and use Allegiant’s baggage fee calculator for your exact flight.
Frequently asked questions
What does Allegiant's cheapest (Basic) fare include for baggage?
Only one free personal item up to 8 x 14 x 18 in (20 x 35 x 45 cm) that fits fully under the seat in front of you. No overhead carry-on and no checked bag — both are paid extras on every route.
How big can my free personal item be on Allegiant?
Maximum 8 x 14 x 18 in (20 x 35 x 45 cm). It must fit completely under the seat ahead of you. This is the only bag included on every fare.
How much is an Allegiant carry-on bag?
A carry-on (max 10 x 16 x 22 in / 25 x 40 x 55 cm) is a paid extra running $10–$75 per segment. It’s cheapest added at booking and a flat $75 if you wait until the airport gate.
How much does a checked bag cost on Allegiant?
Checked bag fees vary by route, date and when you buy. Add it during your original booking for the lowest price; at the airport it can run up to $75 each way per bag. The limit is 50 lb (22 kg) and 80 linear inches.
Is a bag included on Allegiant flights to Mexico?
No. Allegiant applies the same à la carte model on its US–Mexico leisure routes as on US domestic flights — the cheapest fare includes the personal item only. There’s no long-haul or international fare that bundles a checked bag, because Allegiant has no long-haul network.
What are Allegiant's overweight and oversize bag fees?
Bags 51–70 lb add $50 per segment, 71–100 lb add $75 per segment, and bags over 80 linear inches add $75 per segment. Bags cannot exceed 100 lb.
Does Allegiant charge baggage fees per flight or per trip?
Per segment — each individual flight. On a round-trip you pay for the bag on both the outbound and return legs.
Should I buy an Allegiant bundle or add bags individually?
If you need a carry-on, a checked bag and a seat, compare the Bonus or Total bundle against à-la-carte prices. Total bundles both a carry-on and a checked bag; Bonus includes one or the other depending on route. Bundles must be bought during the original booking and can’t be changed later.
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