Budget airlines (Ultra Low Cost Carriers, or ULCCs — Spirit, Frontier, Allegiant, Avelo) frequently offer fares 30-60% below the legacy carriers (American, Delta, United). For points-and-miles travelers, this creates a recurring decision: take the $99 Spirit fare and save the points, or burn 25,000-30,000 miles on the same route on Delta/American? The answer depends on cents-per-point math, ancillary fee tolerance, and trip flexibility. Here is the 2026 framework.
The cents-per-point break-even
The simplest way to evaluate: calculate the cents-per-point of the redemption.
- If cents-per-point is below 1.0¢: Take the cash fare. Points are worth roughly 1¢ each in cash value; below that, you're effectively losing value.
- If cents-per-point is 1.0-1.5¢: Borderline. Other factors (flexibility, status earning, baggage) tip the decision.
- If cents-per-point is 1.5¢+: Take the points redemption. The cash equivalent is meaningfully more than the points are worth in cash.
The math example: $99 Spirit vs 25,000 Delta SkyMiles
| Component | Spirit (cash) | Delta (points) |
|---|---|---|
| Base fare | $99 | 25,000 SkyMiles + $11.20 taxes |
| Carry-on bag | $45 | Free |
| Checked bag (optional) | $45 | Free with status; $30 without |
| Seat selection (optional) | $25 | Free |
| Snack/water | $3-$8 | Free |
| Total cash cost | ~$215 (with carry-on, no checked, no seat) | ~$11 + 25,000 miles |
| SkyMile cents-per-point at $215 vs 25,000 miles | — | ~0.86¢/point |
At 0.86¢/point, the Delta SkyMiles redemption is below the typical 1¢/point baseline. The cash Spirit fare is the better deal — even after factoring in baggage and seat selection.
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The exception: long-haul international
For long-haul international routes, points typically dominate cash. A $5,000 cash trans-Atlantic business class ticket vs 70,000 miles redemption is ~7.1¢/point — clearly worth using points. Budget airlines mostly compete in domestic + nearby international (Caribbean, Mexico, Latin America) routes where ancillary fees are smaller proportionally and cash fares are competitive.
The ancillary fee reality
ULCCs make their margin on ancillary fees. The "naked" $99 fare is rarely what you actually pay:
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- Carry-on bag: $45-$75 each way (sometimes higher than the fare itself)
- Checked bag: $45-$75 each way
- Seat selection: $20-$40 each way
- Priority boarding: $15-$25
- Snacks/drinks: $3-$8 per item
- Airport check-in: $25 if not done online (Spirit specifically)
Budget for these in advance. A $99 fare with all-in ancillaries can hit $250-$350. At that point, the points-redemption math changes.
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The flexibility differential
Legacy carriers offer:
- Free changes within 24 hours of booking (DOT rule)
- Free same-day standby
- Status-related upgrades and lounge access
- Mile-earning toward status
- Better connection-rebooking on weather/mechanical disruption
Budget carriers offer:
- Lower base fares (sometimes dramatically)
- Typically less reliable on-time performance
- Limited rebooking on disruption (typically you're stuck or pay change fees)
- No status-earning
For travelers with flexibility (no tight schedule, willing to wait at the airport if needed) and minimal baggage, budget carriers work. For travelers needing reliability or with status, the points-redemption-on-legacy-carrier path is usually safer.
The decision matrix
| Trip type | Best path |
|---|---|
| Short-haul domestic ($150-$250 cash) | Budget airline + cash; points cents-per-point usually below break-even |
| Last-minute domestic ($400-$700 cash) | Points (especially on AA/UA/DL legacy); break-even almost always works |
| Caribbean / Mexico ($300-$600 cash) | Budget airline if available; points if cash above $600 |
| Long-haul international ($1,500+ cash) | Points; cents-per-point math heavily favors redemption |
| Trip with strict timing | Legacy carrier (cash or points) |
| Trip with status earning priority | Legacy carrier (cash, to earn miles toward status) |
| Family of 4 with checked bags | Often legacy carrier — ancillary fees on budget multiply by 4 |
Bottom line
For short-haul domestic flights where cash fares are $150-$250, budget airlines usually beat points-redemption math. The $99 Spirit fare with carry-on and seat fees totals ~$215, beating a 25,000-mile Delta redemption (~0.86¢/point). For long-haul international flights, points dominate cash on cents-per-point math. The framework is to calculate cents-per-point on every redemption — if it's below 1¢, take the cash; if it's above 1.5¢, take the points.
Compare cash vs points on Pointify →
Last verified by the Pointify research team on May 1, 2026, against current ULCC pricing and ancillary fees. Budget airline pricing varies; verify total all-in cost before booking. Cents-per-point break-even depends on the underlying program's typical redemption value.
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