Spirit, Frontier, or Southwest? I Flew Them All Coast to Coast and Kept Score
Photo: Rillke, CC BY-SA 3.0, via Wikimedia Commons
I did something slightly unhinged: I flew the same basic coast-to-coast itinerary on three different budget airlines within a month, and I tracked everything. Seat pitch. Bag fees. On-time performance. The final bill. The idea was simple — the advertised fares are all within $30 of each other, so which one actually delivers the cheapest real trip?
Here's the scorecard.
Round One: The Advertised Fare Is a Lie (Every Time)
Spirit quoted $114, Frontier $98, Southwest $167 for comparable LAX-to-Baltimore dates. On paper, Frontier wins. But that's before we talk about what actually happens at the airport.
The Bag Fee Breakdown
- Spirit: Carry-on runs $37–$65 depending on when you pay. Pay at booking or get robbed at the gate. Personal item is free but it's genuinely small — my backpack barely squeaked through the sizer.
- Frontier: Similar structure, slightly cheaper if you pay online in advance. Gate agents here are famously strict. I watched a man get charged $99 for a roller bag he could have checked for less.
- Southwest: Two free checked bags. This is the whole ballgame. My fare was $70 higher at booking, but with a carry-on plus a checked bag, Southwest ended up $25 cheaper than Frontier's 'winning' price.
Seats: Your Knees Are the Collateral
Spirit's 28-inch pitch is genuinely rough for anyone over six feet. Frontier's 'UpFront Plus' upsell is real extra legroom, but it costs enough to erase the fare savings. Southwest's open seating is going away, but its standard seats still beat both rivals, and the cabin felt less like a sardine tin with a payment terminal.
Reliability: The Fee Nobody Quotes
This is where it got ugly. On my test window, Spirit's on-time rate hovered in the low 70s — and my return flight was delayed four hours with no meaningful rebooking help. Frontier was similar. Southwest's operation is simply bigger and more resilient; my flights left within 20 minutes of schedule both ways.
A delayed budget flight isn't just an inconvenience. Miss a connection and the 'savings' evaporate into hotel rooms and rebooking fees. Build that risk into the price and the ultra-low-cost model starts looking like a coin flip with extra steps.
The Real Total Cost
| Airline | Base Fare | Bags | Total |
|---|---|---|---|
| Spirit | $114 | $52 | $166 |
| Frontier | $98 | $45 | $143 |
| Southwest | $167 | $0 | $167 |
Frontier 'won' by $24 — for a seat that hurt, an airline that's late a third of the time, and a gate experience I'd describe as adversarial. Southwest delivered a human experience for $24 more. That's not a tough call.
The Verdict
- Worth it: Southwest, every time, when the price gap is under about $60. The free bags and functional operation are worth real money.
- Conditional: Frontier, only if you're flying with a personal item only, paying for bags in advance, and genuinely don't care when you arrive. Nonstop flights only — never connect on Frontier.
- Never again: Spirit. Not because of one bad flight, but because the entire experience is engineered to extract money at every touchpoint, and the operational reliability doesn't justify the discount.
The meta-lesson from this experiment: budget airlines are only cheap if your trip fits exactly inside their fee-free margins — one personal item, nonstop, flexible schedule, cast-iron stomach. The moment you deviate, the math flips. Run your own numbers before you book, and don't let a $20 fare difference decide a trip that could cost you a day of your life in delays.
