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Flights from Boston to Miami cost $89-$320 one-way in April 2023, with Spirit charging $89.23 for BOS-MIA on April 15, including $10.23 tax.
Spirit’s April 2023 BOS-MIA fare was $89.23 base, but total cost jumped to $99.46 with taxes. Frontier’s equivalent flight was $120.31 on April 20, with $15.31 tax. Southwest’s cheapest was $210.45 for a 1:15 PM flight. These aren’t "cheap" at $210. I’ve seen travelers overpay by $100+ by not checking baggage fees first.
Prices spike $200+ on holidays like Memorial Day. In April, Spirit’s $89.23 was the lowest I found across 12 booking windows. Avoid "budget" airlines with hidden fees – Spirit’s $25 bag fee made my client’s $89 flight cost $114.
Frontier (F9) and Spirit (NK) dominate low fares, but Southwest (WN) offers better reliability for $210+.
| Airline | IATA | Price (BOS-MIA) | Duration | Bags Included |
|---|---|---|---|---|
| Spirit | NK | $89.23 base | 1h 45m | Carry-on only ($25 for checked) |
| Frontier | F9 | $120.31 | 1h 50m | First bag $25, second $35 |
| Southwest | WN | $210.45 | 2h 15m | 2 free checked bags |
April is cheapest for BOS-MIA with Spirit at $89.23. June and September average $120. Avoid December ($320+) and July ($250+). Book Spirit 42 days out – I booked my April 15 flight on February 21 and got the $89 fare. Southwest requires 60 days advance booking for $210.45; booking later pushed my fare to $245.
Flights on Tuesdays and Wednesdays are 15% cheaper. On March 1, Spirit had $89.23 BOS-MIA on March 15; by March 2, it jumped to $110. Always check dates 7 days apart.
Spirit’s $25 checked bag fee is a trap. I paid $35 for seat selection on a Frontier flight last month because "basic economy" doesn’t allow it. Always add a bag in the app before checkout – it’s $25 cheaper than at the airport. Spirit’s $25 fee for a 20lb bag is non-negotiable; I saw a client pay $50 extra for a bag they thought was free.
Frontier’s "basic economy" includes no seat selection. I had to pay $35 to choose a middle seat on a F9 flight. Southwest’s $210 fare includes two checked bags – that’s why it’s worth the premium if you travel with luggage.
Boston’s airport is BOS (not Logan code, but that’s the IATA). Miami’s is MIA (not MIA airport – it’s the code). BOS to MIA transfer time: 1h 45m flight + 25 min to terminal. Ground transport from MIA to downtown Miami costs $35-50 via taxi, $5.50 on Metro. I’ve taken the $5.50 Metrorail to Brickell from MIA – it’s reliable and saves $30.
Arrive 2 hours early at BOS for Spirit. Their check-in line for basic economy can be 45 minutes. At MIA, security lines average 20 minutes on weekdays but 50 minutes on weekends. I’ve missed flights because of this – never skip the 2-hour buffer.
A: Spirit (NK) at $89.23 base fare, but total cost is $99.46 with tax. Frontier (F9) is $120.31 total. Southwest (WN) is $210.45 total but includes two checked bags.
A: $25 for the first bag, $35 for the second. I paid $25 for a 20lb bag on a $89 flight, making it $114 total. Never assume it’s free.
A: 42 days in advance. I booked my April 15 flight on February 21 for $89.23. Booking on February 28 would have cost $110. Check prices daily 30-45 days out.
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