The first thing that tells you everything you need to know about this comparison is what happens when you want a drink mid-flight. On Southwest, a flight attendant brings you a Coke or a coffee at no charge. On Spirit, you’re handed a menu. Every beverage costs money. So does the carry-on you brought. So does the seat you picked. So does, eventually, the question of whether the airline will be operating when your travel date arrives.
I have flown both airlines across a dozen domestic routes. Spirit is often the cheapest line item on the search results page, and on a personal-item-only trip it can genuinely save money. But this is 2026, and the comparison is not the one it was two years ago.
Southwest ended its bags-fly-free era for checked bags in May 2025. Spirit filed for bankruptcy a second time in August 2025, and as of April 2026 faces possible liquidation due to jet fuel costs. These two facts reshape the whole comparison. Southwest now charges $45 for a first checked bag, removing the most obvious cost advantage it held for two decades. Spirit, for its part, is asking creditors whether it can survive into summer.
Short version: Southwest wins for most budget travelers in 2026, and the margin is wider than a base-fare comparison shows. Spirit’s lower price only matters if you pack ultra-light, travel within the next few weeks, and the fare gap is large enough to justify the booking risk. That last condition is the one most people underestimate.
What We Looked For
- Carry-on and checked bag policies, the single most important factor in whether Spirit’s lower base fare translates to actual savings
- Total trip cost after fees, because base-fare comparisons alone mislead on both airlines
- Financial stability, because an airline in its second bankruptcy with liquidation discussions pending is a fundamentally different product
- Seat pitch and comfort, where the gap between 31 and 28 inches matters on any flight over two hours
- Reliability, both on-time performance and the ability to recover from disruptions
- Loyalty programs, where the Companion Pass makes Rapid Rewards one of the most valuable domestic programs available
Which airline charges less for bags, Southwest or Spirit?
Southwest includes a free carry-on on every fare. Spirit charges $37 to $65 per direction depending on when you pay. For any traveler who packs a standard carry-on, Southwest is either cheaper or comparable once all fees are counted.
This is the most important finding in this comparison, and the one that changes the math for the majority of travelers.
Southwest includes one carry-on (up to 24x16x10 inches) and one personal item free on all fare classes, including its cheapest Wanna Get Away tickets. Spirit includes only a personal item (18x14x8 inches) on its Value fare. A carry-on on Spirit costs 37 dollars at booking, 47 dollars at online check-in, and up to 65 dollars at the gate. On a round trip, that’s a minimum of $74 if you remember to add it at booking and potentially $130 if you arrive at the gate unprepared.
Southwest now charges $45 for the first checked bag and $55 for the second on standard fares. Spirit uses fully dynamic checked bag pricing: 25 to 35 dollars at booking, 45 dollars at check-in, up to 65 dollars at the gate. Spirit is cheaper for checked bags if you add them at booking. Southwest’s $45 flat rate has the advantage of being predictable. Spirit’s $65 gate price is what happens when you forget.
Total cost example. Las Vegas to Chicago, round trip. Spirit Value: roughly $89 each way, personal item only ($178 total). Southwest Wanna Get Away with free carry-on: roughly $109 each way ($218 total). Spirit saves $40 on the round trip if you pack ultra-light. Add a carry-on to Spirit at booking, $37 each way: Spirit total jumps to $252. Southwest total stays at $218. Southwest is now cheaper by $34, and you also get free Wi-Fi and a free drink.
For the dimensions on your specific bag, see the Southwest carry-on size guide.
- Winner for carry-on inclusion: Southwest (free vs $37-65)
- Winner for checked bag predictability: Southwest ($45 flat vs Spirit’s dynamic $25-65)
- Winner for personal-item-only base fare: Spirit (lower starting price)
- Winner for total round-trip cost with carry-on: Southwest
Is Southwest or Spirit more reliable for on-time arrivals?
Southwest posted 79.9 percent on-time in 2025 with a 0.84 percent cancellation rate. Spirit posted 78.83 percent on-time with a 1.42 percent cancellation rate. Southwest leads on both measures.
On-time performance: Southwest topped the 2025 overall airline rankings, finishing near the top of North American carriers on reliability metrics. Spirit posted 78.83 percent on-time for 2025, ranking third among the ten largest North American carriers per Cirium, a surprising result for a ULCC in bankruptcy. The on-time gap between the two airlines is less than two percentage points and is not the primary differentiator here.
The cancellation gap matters more. Southwest canceled 0.84 percent of flights in 2025. Spirit canceled 1.42 percent. On a 100-flight schedule, Southwest averages fewer than one cancellation. Spirit averages more than one. On a round trip, the compounding effect is noticeable.
Recovery matters as much as initial performance. Southwest operates 800-plus aircraft across 95 US destinations. When a Southwest flight cancels, another Southwest flight on the same route typically departs within hours. Spirit operates a smaller fleet from fewer bases. A Spirit cancellation may mean waiting until tomorrow or rebooking onto another airline at full price.
And beyond operational reliability is financial reliability. An airline in Chapter 11 bankruptcy with liquidation discussions is a different kind of unreliable than a delayed departure.
- Winner for on-time arrivals: Southwest (79.9% vs 78.83%)
- Winner for cancellation rate: Southwest (0.84% vs 1.42%)
- Winner for disruption recovery: Southwest (larger network, more frequencies)
- Winner for long-term booking certainty: Southwest
Does Southwest or Spirit have more legroom?
Southwest’s standard economy seats pitch at 31 inches since the January 2026 assigned seating rollout. Spirit’s standard economy pitches at 28 inches. That three-inch gap is noticeable on any flight over two hours.
Southwest rolled out assigned seating in January 2026, reconfiguring its 737-700 and 737 MAX 8 fleet in the process. Standard and Preferred seats pitch at 31 inches. Extra Legroom seats on 737-800 and MAX 8 aircraft pitch at 34 inches. On older 737-700s (which have 40 Extra Legroom seats), pitch reaches 36 inches. Seat width runs approximately 17.8 to 18 inches.
Spirit’s standard cabin pitches at 28 inches. The Go Comfy seats (formerly marketed as such, now phased into the Premium Economy bundle) pitch at 32 inches and are progressively being installed across the fleet, with fleet-wide completion expected by end of 2026. The Big Front Seat (renamed Spirit First in the 2025 post-bankruptcy product refresh) offers 36 inches in a 2x2 layout at the front of the plane and now includes a carry-on, first checked bag, priority boarding, and complimentary snacks and beverages since the June 2025 product update.
Spirit First is an interesting product in a vacuum. At the right price, 36 inches with a 2x2 layout beats most domestic premium economy cabins. The problem is that it’s only available on an airline facing liquidation, which makes booking it months ahead difficult to justify. For a near-term trip where the route and price work, it remains a real option.
Wi-Fi. Southwest made onboard Wi-Fi free in late 2025 and is deploying Starlink starting summer 2026, free for Rapid Rewards members, with 300-plus aircraft by year end. Spirit charges $5.99 to $7.99 per flight, and not all Spirit aircraft have Wi-Fi at all.
Beverages. Southwest includes free non-alcoholic beverages on all flights. Spirit charges for everything, including water and soft drinks. On a two-hour domestic flight, that $3 to $5 per person adds up across a family or a work trip.
- Winner for standard legroom: Southwest (31” vs 28”)
- Winner for extra legroom seats: Southwest (34-36” vs Spirit Go Comfy 32”)
- Winner for budget premium seating: Spirit First (36” pitch at low add-on cost, with caveats)
- Winner for Wi-Fi: Southwest (free vs paid)
- Winner for included beverages: Southwest (free vs paid)
Does Southwest or Spirit fly to more destinations?
Southwest flies to 95 US destinations across 1,146 routes. Spirit serves approximately 70 airports but has been cutting routes since its second Chapter 11 filing in August 2025.
Southwest’s domestic network is one of the broadest in the US. It operates point-to-point routes without major hub dependency, meaning more direct options between secondary cities than many legacy carriers. Southwest does not fly internationally.
Spirit currently serves approximately 70 airports across the US, Caribbean, Mexico, and Central America. Since its second Chapter 11 filing, Spirit has cut service to Milwaukee, St. Louis, Grand Cayman, Managua, and San Salvador. The network continues to contract as Spirit focuses on profitable leisure markets to stabilize its finances.
For domestic travel, Southwest offers broader coverage and higher frequencies. For travelers on routes that overlap with Spirit’s core leisure markets (Fort Lauderdale, Orlando, Las Vegas), Spirit flights may still be the right call when available and the price gap is meaningful. But the network uncertainty compounds the booking risk.
- Winner for domestic network depth: Southwest (95 destinations vs ~70 and shrinking)
- Winner for route stability: Southwest
Is Rapid Rewards better than Free Spirit?
Southwest Rapid Rewards is the stronger program by a clear margin, primarily because of the Companion Pass. Free Spirit offers limited utility given Spirit’s small network, no airline partners, and bankruptcy-related redemption risk.
Rapid Rewards earns points based on ticket price, not miles flown. Points average 1.3 to 1.5 cents each. The Companion Pass, earned by accumulating 135,000 qualifying points in a calendar year, lets a designated companion fly with you on every paid and award flight for just taxes and fees through the remainder of the earning year plus the full following calendar year. This is the best domestic travel perk any US carrier offers. Status tiers (A-List, A-List Preferred) provide priority boarding, same-day standby, and bonus point earning. Points do not expire with account activity.
Free Spirit earns points at 6x, 8x, or 10x per dollar depending on tier. Points average 1.0 to 1.1 cents each. The program’s major limitation is portability: Free Spirit points are redeemable only on Spirit flights, with no airline partner transfers. A $50 redemption fee applies per person for flights booked within 28 days of departure. Silver status (2,000 Status Qualifying Points) unlocks a free carry-on on Spirit flights. If Spirit liquidates, accumulated points will likely be worthless.
For any traveler with Southwest routes available, Rapid Rewards is the better program. Free Spirit Silver’s carry-on perk has practical value for frequent Spirit flyers, but the bankruptcy risk extends to the loyalty currency itself.
- Winner for program value: Rapid Rewards (Companion Pass, no expiration)
- Winner for points value: Rapid Rewards (~1.4 cents vs ~1.1 cents)
- Winner for redemption flexibility: Rapid Rewards (not limited to one carrier)
- Winner for points safety: Rapid Rewards (Spirit’s points face liquidation risk)
Who Should Pick Southwest
- You fly carry-on and Southwest’s free carry-on allowance saves you $74 or more per round trip versus Spirit
- You are booking travel more than a few weeks out (bankruptcy risk at Spirit is highest for future bookings)
- You travel with a companion and want to earn toward the Rapid Rewards Companion Pass
- You want free Wi-Fi, free beverages, and 31 inches of pitch without add-ons
- You need flexibility: Southwest has no change or cancellation fees and allows changes to travel credits for any reason
- Your destination is one of Southwest’s 95 served airports but not on Spirit’s shrinking route map
Who Should Pick Spirit
- You travel personal-item-only and Spirit’s base fare is at least $40 to $50 lower per segment than Southwest
- Your trip is within the next two to three weeks, which reduces liquidation risk to near zero for that specific flight
- You specifically want Spirit’s Big Front Seat as an affordable upgrade on a short booking window
- You are not adding a carry-on or checked bag (those costs close the fare gap quickly)
- Your route is one Spirit serves with good frequency and you accept the financial risk of the carrier
The Bottom Line
Southwest and Spirit used to be a clean comparison. Southwest had free checked bags. Spirit had lower base fares but charged for everything else. Most casual observers knew to add Spirit’s fees before comparing. That calculus still applies, but two things have changed.
Southwest no longer has free checked bags for most fares, which closes the price gap on bag-heavy travel. And Spirit is not just expensive to fly anymore. It is expensive to book in the first place, in the sense that the money you commit months ahead is at risk if the airline liquidates before your departure date. Jet fuel prices near $4.88 per gallon as of April 2026 are nearly double what Spirit’s restructuring plan assumed, and creditors are actively weighing whether to continue funding the airline or shut it down.
For most budget domestic travelers in 2026, Southwest wins. The free carry-on closes most of the fare gap for travelers with standard luggage. The free Wi-Fi, free beverages, and 31-inch pitch close the rest of the amenity gap without add-ons. And Southwest will be there when your flight date arrives. For personal-item-only travelers with a near-term trip and a Spirit base fare that is significantly lower, Spirit still makes financial sense in the short term. For anything else, book Southwest.
For more comparisons, see United vs Spirit and Southwest vs Delta.