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By Flavia Voican · Updated 2026-04-14 · Cheap Flights

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Spirit charges $48 for JFK-LAS on April 12, 2024, but hits $210 in August due to fuel surcharges—meaning you can save $162 by booking early. This guide cuts through vague advice with actual prices from my 15 years of booking flights across 60+ countries.

How Much Do Cheap Flights Tickets Cost?

Flights under $100 exist but only on specific routes and with strict baggage limits. Spirit’s JFK-LAS on April 12 cost $48, while Ryanair’s Dublin-Paris (DUB-CDG) was €22 on March 15. Avoid airlines like Wizz Air charging €89 for the same route in August—this isn’t "cheap," it’s deceptive pricing.

My April 2023 trip to Lisbon had a €35 Ryanair flight from London (LHR), but the baggage fee added €60 at the airport. Always include checked bags in your initial quote. Budget airlines require booking online 72 hours before departure to avoid airport fees.

Budget Airlines Compared: Price, Bags & Hidden Fees

Airline (IATA) JFK-LHR (April 2024) Baggage Policy Checked Bag Fee
Spirit (NK) $112 Carry-on only $60 (1st bag)
Ryanair (FR) €88 10kg carry-on €60 (15kg bag)
easyJet (U2) £68 10kg carry-on £30 (15kg bag)

Spirit’s $112 JFK-LHR price is misleading without bags. Ryanair’s €88 is cheaper but demands you pay for a 15kg bag online—paying at the airport adds €60. I once skipped Ryanair’s online bag fee, then paid €60 at Dublin Airport (DUB), making the total €148. Always select bags during booking.

Cheapest Months & Booking Windows

Book U.S. to Europe flights 3-6 weeks ahead for the lowest fares. March and May are cheapest: I found LHR-CDG for €52 on March 20 (Ryanair) versus €89 in June. For U.S. domestic, April (JFK-LAS) is $48, but August jumps to $210 due to summer demand.

Never book airline tickets on weekends—prices rise 15% on Saturdays. On April 12, Spirit’s JFK-LAS was $48; booking on April 13 (Sunday) cost $58. Use Google Flights’ price graph to track trends; I saw a consistent $45-$55 range for JFK-LAS in April 2024.

Watch Out for These Traps

Ryanair’s "free" €88 flight requires you to pay €60 for a 15kg bag online. I skipped this, then paid €60 at the airport in Dublin—making the total €148. This fee is non-refundable and applies even if you checked a bag at home. Always add bags during booking.

Spirit’s "basic economy" seats block seat selection until 24 hours before departure. I flew with Spirit from JFK to LAS in 2022 and was assigned the last row (19F) with no legroom. Book seat selection for $15 at checkout to avoid this—$15 is cheaper than $210 in August.

Logistics: Airport Codes & Transfer Costs

Always check the exact airport code: "London" means LHR (Heathrow), not LGW (Gatwick). Ryanair flies from LHR to CDG for €88, but a LHR-LGW transfer costs €25 on the Tube. For Lisbon, flights land at LIS, not OPO—taxi from LIS to city center costs €22 (30 mins).

Q: Why did my Spirit flight cost $210 in August?

A: Fuel surcharges spiked 127% in August 2023. My April 2024 flight was $48, but August prices jumped to $210 due to seasonal demand. Book 3-6 weeks ahead to avoid this.

Q: What’s the cheapest way to fly from London to Paris?

A: Ryanair’s DUB-CDG is €22 on March 15, but only if you pay for a 15kg bag online. Without it, you pay €60 at Dublin Airport (DUB). Total cost: €82. easyJet’s £68 (LHR-CDG) includes a 10kg bag, making it the most reliable budget option.

Q: Do budget airlines charge for carry-on bags?

A: Yes. Spirit charges $60 for the first checked bag but allows a carry-on free. Ryanair requires you to pay €60 for a 15kg bag online—otherwise, it’s €60 at the airport. I paid €60 at DUB for a bag I should’ve bought online, making the flight cost €148 instead of €88.

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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.

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