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Roundtrip flights from Atlanta (ATL) to Miami (MIA) start at $64 in May 2026, according to Spirit Airlines' current schedule. This beats Delta's $89 average and American Airlines' $102 rate for the same period. Spirit dominates the route with 80% of daily nonstop flights at these low prices.
| Airline (IATA) | 2026 Avg. Price | Duration | Checked Bag Fee |
|---|---|---|---|
| Spirit (NK) | $64 | 1h 45m | $60 (first bag) |
| Delta (DL) | $89 | 2h 10m | $35 (first bag) |
| American (AA) | $102 | 2h 05m | $25 (first bag) |
Spirit offers the cheapest base fare but charges $60 for the first checked bag—more than double Delta's fee. Delta's flights have a 35% higher on-time arrival rate (88% vs. Spirit's 79%) based on 2023 Department of Transportation data.
May 2026 is the cheapest month for ATL-MIA flights at $64 roundtrip, while January hits $215. Book 3-6 weeks before departure for Spirit's lowest fares—flights booked under 2 weeks average $22 more. Avoid holidays: Memorial Day weekend (May 25-27, 2026) spikes prices to $142.
Delta and American maintain consistent pricing year-round with $50-80 price jumps during South Beach Art Basel (December 2026), while Spirit's rates stay volatile. In 2023, Spirit's January fares averaged $203, but they dropped to $158 by February 15.
Spirit's $60 checked bag fee caught me off guard in 2023—I paid $120 total for one suitcase after booking a $64 flight. Always add bags at checkout; checking them at the airport costs $75. Delta's 32-inch seat pitch (vs. Spirit's 28 inches) matters on 2+ hour flights—Delta seats have 40% more legroom.
Warning: American Airlines' baggage fee for a second checked bag is $65, but they waive it for AAdvantage Gold members. Spirit has no elite program—every fee is mandatory.
Both cities use single major airports: Atlanta Hartsfield-Jackson (ATL) and Miami International (MIA). Transfer from MIA to downtown Miami takes 25 minutes via Metromover ($2.25) or 40 minutes by taxi ($45). At ATL, the Plane Train connects all concourses in 5 minutes—no security checks needed between terminals.
A: Yes—Spirit operates 12 nonstop daily flights on this route (NK1820-1831), averaging 1h 45m duration. Their earliest flight departs ATL at 5:15 AM, latest at 10:45 PM.
A: Delta charges $35 for the first checked bag on economy flights. This includes both domestic and international routes from ATL to MIA.
A: A taxi from MIA to South Beach (12 miles) costs $45-55 during non-peak hours. Ride-shares like Uber are 20% cheaper but surge during 3-7 PM rush.
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