Are Budget Airlines Less Reliable Than Legacy Carriers?

Yes — over the past two years, America's three ultra-low-cost carriers (Spirit, Frontier, and Allegiant) averaged a 74.5% on-time arrival rate, versus 79.5% for the five full-service legacy carriers (Delta, United, American, Alaska, and Hawaiian). Budget carriers also cancelled flights more often — 1.9% of the time on average, versus 1.3% for legacy airlines.

• Legacy carriers average 79.5% on-time, budget carriers average 74.5% — a 5-point gap across the five full-service airlines versus the three ultra-low-cost carriers.
• Hawaiian Airlines is the most reliable US carrier overall, at 84.2% on-time and just 0.8% cancelled — a legacy full-service airline, not a budget one.
• Frontier has the worst on-time record of any major US carrier, at 72.2% on time — below every legacy and ultra-low-cost competitor.
• Southwest and JetBlue sit in between — Southwest posts 78.8% on time with the best cancellation rate of any major carrier (0.8%), while JetBlue posts 73.8% on time with a 2.0% cancellation rate.
• Budget carriers cancel flights about 50% more often than legacy carriers — a 1.9% average versus 1.3%.

How we're defining "budget" vs "legacy" here

"Legacy" here means the five full-service US carriers that operate their own long-haul and international networks: Delta, United, American, Alaska, and Hawaiian. "Budget" means the three ultra-low-cost carriers built around bare-fare pricing and add-on fees: Spirit, Frontier, and Allegiant. Southwest and JetBlue are treated separately below — both are low-cost by ticket price, but neither runs the ultra-low-cost model of the first three. Regional carriers (Endeavor Air, Republic Airways, Envoy Air, SkyWest, PSA Airlines) are excluded entirely: they operate flights under partner brand names like Delta Connection, American Eagle, and United Express, so travelers don't book them directly.

Legacy carriers' on-time and cancellation record

• Hawaiian — 84.2% on time, 0.8% cancelled, 9.7 min average arrival delay
• Delta — 81.1% on time, 1.4% cancelled, 14.5 min average arrival delay
• United — 79.5% on time, 1.1% cancelled, 15.5 min average arrival delay
• Alaska — 78.2% on time, 1.1% cancelled, 12.2 min average arrival delay
• American — 74.7% on time, 2.0% cancelled, 22.1 min average arrival delay — the weakest legacy carrier, and barely ahead of the budget average

Ultra-low-cost carriers' record

• Spirit — 76.0% on time, 2.6% cancelled (the highest cancellation rate among carriers travelers book directly), 18.3 min average arrival delay
• Allegiant — 75.3% on time, 1.1% cancelled, 22.1 min average arrival delay
• Frontier — 72.2% on time, 2.1% cancelled, 23.4 min average arrival delay — the lowest on-time rate of any major US carrier

Southwest and JetBlue: the middle ground

Southwest and JetBlue don't fit neatly into either group. Southwest posts a 78.8% on-time rate — closer to the legacy average than the budget average — with the best cancellation rate of any major carrier at 0.8%. JetBlue posts 73.8% on time with a 2.0% cancellation rate, closer to the ultra-low-cost group's numbers despite marketing itself as a full-service airline with assigned seats and more legroom.

Why the reliability gap likely exists

Ultra-low-cost carriers keep fares low partly by running planes on tighter schedules with less spare capacity: fewer backup aircraft, fewer spare crews, and shorter turnaround times between flights. That model maximizes how many hours each aircraft flies per day, but it also means a single delayed inbound flight, mechanical issue, or crew scheduling snag has less slack to absorb before it cascades into the next flight — and the next, and the next. Legacy carriers generally run larger fleets and denser route networks, giving them more room to reroute passengers and swap aircraft when something goes wrong.

For a closer look at two of the largest budget carriers specifically, see Spirit vs. Frontier: Which Budget Airline Is More Reliable?

Frequently asked questions

Which airline has the best on-time record overall?

Hawaiian Airlines, at 84.2% on time and just 0.8% cancelled — the best combined record of any major US carrier, budget or legacy.

Which airline cancels the most flights?

Among carriers travelers book directly (excluding regional carriers that fly under partner brand names), Spirit Airlines has the highest cancellation rate, at 2.6%.

Is Southwest a budget airline?

It's low-cost by fare, but not "ultra-low-cost" in the way Spirit, Frontier, and Allegiant are — Southwest doesn't charge separately for a first checked bag or seat selection in the same way, and its on-time and cancellation numbers (78.8% on time, 0.8% cancelled) track much closer to the legacy carriers than to the ultra-low-cost group.

Does paying more always mean a more reliable flight?

Not necessarily. American Airlines — a full-service legacy carrier — posts a 74.7% on-time rate, barely ahead of the 74.5% budget-carrier average and well behind Southwest's 78.8%, despite Southwest generally being the cheaper ticket. Airline choice matters more than the legacy-vs-budget label alone.

Where can I compare airlines directly?

See the full most reliable airlines ranking or the most-cancelled airlines ranking, or check any individual airline's page for its full on-time record.