Precise air miles between any two airports
Free, no-signup tool computing exact geodesic distance with the Vincenty formula, plus estimated flight time, CO₂ emissions by cabin class, and jet-lag recovery — visualised on a live 3D globe.
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Primary sources · 8
- [1] Vincenty (1975) — Iterative geodesic-distance formula on the WGS-84 ellipsoid — the formula behind every distance the calculator returns · Survey Review XXIII (176), pp. 88–93 · April 1975 https://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf
- [2] NGA.STND.0036_1.0.0_WGS84 — Reference ellipsoid — a = 6,378,137 m, 1/f = 298.257223563 · National Geospatial-Intelligence Agency · July 2014 https://earth-info.nga.mil/index.php?dir=wgs84&action=wgs84
- [3] DESNZ 2024 GHG conversion factors — Per-passenger-km kg CO₂e factors for three distance bands and four cabin classes · UK Department for Energy Security and Net Zero · June 2024 https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2024
- [4] Lee et al. (2021) — Aviation effective radiative forcing decomposition — basis for the 1.9× non-CO₂ uplift · Atmospheric Environment 244, 117834 · January 2021 https://doi.org/10.1016/j.atmosenv.2020.117834
- [5] OpenFlights data — Airport, airline, and route reference data — ODbL v1.0; ~3,000 airports with IATA codes · openflights.org/data.php · Community-maintained; routes captured June 2014 https://openflights.org/data.php
- [6] ACI World — 2023 passenger traffic — Authoritative ranking of busiest airports — used in the homepage stats and /learn/busiest-airports-in-the-world · Airports Council International · July 2024 https://aci.aero/2024/07/16/top-20-busiest-airports-in-the-world-confirmed-by-aci-world/
- [7] IATA Fly Net Zero 2050 — Industry net-zero pathway resolution — referenced in alliance / SAF coverage · IATA AGM 77, Boston · 4 October 2021 https://www.iata.org/en/programs/sustainability/flynetzero/
- [8] Sack (2010) — Jet lag — Clinical chronobiology review used for jet-lag severity bands and recovery rates · New England Journal of Medicine 362:440-447 · February 2010 https://www.nejm.org/doi/full/10.1056/NEJMcp0909838
Popular Routes
Did You Know?
Great circle routes often look curved on flat maps, but they're actually the shortest path between two points on Earth. A flight from New York to Tokyo appears to curve north over Alaska on a map, but this is actually the most direct route—saving over 2,000 miles compared to flying “straight” across the Pacific!
Why Use AirMilesCalc?
Precise Calculations
Using the Vincenty formula for geodesic distance, accurate to within 0.5mm on Earth's surface.
3D Globe Visualization
See the great circle route between airports on an interactive 3D globe.
3,000+ Airports
Real data from OpenFlights database covering airports worldwide with IATA codes.
World's Longest Commercial Flights
These are the longest non-stop commercial routes currently operating, measured by great circle distance. Data based on scheduled airline services as of 2025 ( OAG).
| # | Route | Airline | Distance | Flight Time | Aircraft |
|---|---|---|---|---|---|
| 1 | New York (JFK) → Singapore (SIN) | Singapore Airlines | 9,537 mi | ~18h 30m | A350-900ULR |
| 2 | Singapore (SIN) → Newark (EWR) | Singapore Airlines | 9,534 mi | ~18h 30m | A350-900ULR |
| 3 | Perth (PER) → London (LHR) | Qantas | 9,009 mi | ~17h 15m | 787-9 |
| 4 | Abu Dhabi (AUH) → Los Angeles (LAX) | Etihad Airways | 8,390 mi | ~16h 30m | 777-200LR |
| 5 | Dubai (DXB) → Los Angeles (LAX) | Emirates | 8,339 mi | ~16h 20m | A380 |
| 6 | Dallas (DFW) → Sydney (SYD) | Qantas | 8,578 mi | ~17h 00m | 787-9 |
| 7 | Doha (DOH) → Auckland (AKL) | Qatar Airways | 9,032 mi | ~17h 30m | 777-200LR |
| 8 | Dubai (DXB) → San Francisco (SFO) | Emirates | 8,103 mi | ~15h 45m | A380 |
Distances are great circle measurements. Actual flight paths may differ slightly due to air traffic routing and weather. Source: Airline schedules and Flightradar24.
Airline Alliance Guide
The three major airline alliances let you earn and redeem frequent flyer miles across partner carriers. Understanding alliances helps you maximize the value of your air miles. Learn more at IATA.org.
Star Alliance
Founded 1997
| Members | 26 airlines |
| Destinations | 1,200+ |
| Countries | 195 |
| Key Members | United, Lufthansa, ANA |
oneworld
Founded 1999
| Members | 14 airlines |
| Destinations | 900+ |
| Countries | 170 |
| Key Members | AA, BA, Qantas, JAL |
SkyTeam
Founded 2000
| Members | 19 airlines |
| Destinations | 1,060+ |
| Countries | 175 |
| Key Members | Delta, Air France, KLM |
Global Aviation by the Numbers
Key statistics about the worldwide aviation industry. Data from ICAO, IATA, and ACI World.
World's Busiest Airports by Passenger Traffic (2024)
Source: Airports Council International (ACI)
| # | Airport | Code | Passengers | Visual |
|---|---|---|---|---|
| 1 | Hartsfield-Jackson Atlanta | ATL | 95.5M | |
| 2 | Dubai International | DXB | 92.3M | |
| 3 | Dallas/Fort Worth | DFW | 81.8M | |
| 4 | London Heathrow | LHR | 81.4M | |
| 5 | Denver International | DEN | 77.8M | |
| 6 | Istanbul Airport | IST | 76.5M | |
| 7 | Los Angeles International | LAX | 75.1M | |
| 8 | Chicago O'Hare | ORD | 74.0M | |
| 9 | Tokyo Haneda | HND | 72.5M | |
| 10 | Delhi Indira Gandhi | DEL | 71.2M |
How to Use This Calculator
Using AirMilesCalc is straightforward. Follow these steps to calculate the distance between any two airports:
Enter Your Origin Airport
In the “From” field, start typing your departure city or airport. You can search by:
- City name: “London”, “New York”, “Tokyo”
- Airport name: “Heathrow”, “JFK”, “Narita”
- IATA code: “LHR”, “JFK”, “NRT”
Select the correct airport from the dropdown list that appears.
Enter Your Destination Airport
In the “To” field, repeat the same process for your arrival airport. As you select airports, the 3D globe below the calculator will update to show both locations.
Click Calculate Distance
Once both airports are selected, click the blue “Calculate Distance” button. You'll be taken to a detailed results page with comprehensive flight information.
Review Your Results
The results page provides comprehensive information including:
- Distance in miles, kilometers, and nautical miles
- Estimated flight time based on commercial aircraft speeds
- CO2 emissions by cabin class (economy, business, first)
- Route classification (short-haul, medium-haul, long-haul)
- Flight direction and bearing
- Time zone difference and jet lag assessment
- Airlines operating the route
- An animated 3D visualization of the flight path
Tips for Accurate Results
- • For cities with multiple airports (like London or New York), select the specific airport you're interested in
- • Use the swap button (↔) to quickly reverse your route for return flight calculations
- • Clear the input field using the X button if you need to start a new search
- • Flight times are estimates—actual times vary with weather, aircraft type, and routing
Real-World Examples
Here are some practical scenarios showing how travelers use AirMilesCalc for their journey planning:
Transatlantic Business Trip
Maria, a marketing executive based in New York, needs to plan a client meeting in London. She wants to understand the flight duration and time difference to schedule her meetings appropriately.
Takeaway: With a 5-hour time difference, Maria should schedule morning meetings in London to align with her natural energy levels after eastward travel.
Comparing Carbon Footprints
David is environmentally conscious and wants to understand the carbon impact of his upcoming vacation. He's comparing a trip from San Francisco to Honolulu versus driving to Los Angeles.
Takeaway: David can use this information to purchase carbon offsets or make informed decisions about his travel frequency.
Tracking Qualifying Miles
Jennifer is 15,000 miles short of elite status renewal. She needs to find a route that will earn her enough qualifying miles while visiting family in Miami.
Takeaway: The round trip earns 4,684 base miles, but Jennifer may need additional multipliers or another trip to reach her goal.
Planning for Jet Lag
Tom and his family are planning a vacation from Chicago to Tokyo. They want to understand the jet lag impact so they can plan recovery time into their itinerary.
Takeaway: With a 14-hour difference, Tom should plan 7-10 days of recovery time and avoid scheduling important activities on arrival day.
Expense Report Documentation
Sarah is a consultant who needs to document flight distances for her expense reports and corporate carbon accounting. Her company requires accurate mileage for reimbursement calculations.
Takeaway: AirMilesCalc provides distance in multiple units (miles, km, nautical miles) suitable for different corporate reporting requirements.
Study Abroad Planning
Alex is a college student planning a semester abroad in Barcelona. He wants to understand how far he'll be from home and estimate costs for visiting family.
Takeaway: At 3,650 miles each way, Alex can use this to estimate fuel surcharges and plan the best times to call home given the 6-hour difference.
When to Use This Calculator
Planning Scenarios
- •Trip planning: Understand flight duration and jet lag before booking
- •Route comparison: Compare distances for different connection options
- •Meeting scheduling: Calculate time differences for international meetings
- •Layover decisions: Determine if a connection makes geographic sense
Professional Use Cases
- •Expense reports: Document accurate flight distances for reimbursement
- •Carbon accounting: Calculate emissions for corporate sustainability reports
- •Frequent flyer tracking: Verify qualifying miles before booking
- •Travel policy compliance: Check if routes meet company guidelines
Educational Purposes
- •Geography lessons: Visualize distances and great circle routes
- •Math projects: Explore geodesic calculations and spherical geometry
- •Environmental studies: Research aviation's carbon footprint
Personal Interest
- •Curiosity: Find out exactly how far your favorite destinations are
- •Travel logging: Track total miles traveled over your lifetime
- •Eco awareness: Understand your personal flight carbon footprint
Pro Tip: Mileage Run Planning
If you're chasing frequent flyer status, use our calculator to find routes that maximize qualifying miles per dollar. Look for long-haul routes on sale—a round trip from the US to Asia or Australia can earn 15,000-25,000 miles. Compare the cost per mile for different routes to find the best value for your status goals.
Quick Reference Tables
Use these reference tables to quickly understand flight classifications, CO2 emissions by cabin class, and distance conversions.
Flight Route Classifications
| Classification | Distance | Typical Aircraft |
|---|---|---|
| Short-haul | < 1,500 km | A320, 737, E190 |
| Medium-haul | 1,500 - 4,000 km | A321, 737 MAX |
| Long-haul | 4,000 - 12,000 km | 777, A350, 787 |
| Ultra-long | > 12,000 km | A350-900ULR, 777-200LR |
CO2 Emissions by Cabin Class
Based on DEFRA 2024 emission factors with radiative forcing
| Cabin Class | Multiplier | kg CO2e/km |
|---|---|---|
| Economy | 1.0x | 0.255 |
| Premium Economy | 1.6x | 0.408 |
| Business | 2.9x | 0.740 |
| First Class | 4.0x | 1.020 |
Multipliers reflect seat space allocation per passenger
Distance Unit Conversions
| From | To | Multiply by |
|---|---|---|
| Kilometers | Miles | 0.621371 |
| Kilometers | Nautical Miles | 0.539957 |
| Miles | Kilometers | 1.60934 |
| Nautical Miles | Kilometers | 1.852 |
Jet Lag Severity Guide
| Time Zones | Severity | Recovery |
|---|---|---|
| 0-2 hours | None | Immediate |
| 3-5 hours | Mild | 1-2 days |
| 6-9 hours | Moderate | 3-5 days |
| 10+ hours | Severe | 7-10 days |
Eastward travel is typically harder to adjust to than westward
Formula Reference
The Vincenty Formula
AirMilesCalc uses the Vincenty formula to calculate geodesic distances on an ellipsoid. This provides sub-millimeter accuracy by accounting for Earth's true shape (oblate spheroid) rather than treating it as a perfect sphere.
// WGS-84 Ellipsoid Parameters a = 6,378,137 m // Semi-major axis (equatorial radius) f = 1/298.257223563 // Flattening b = a × (1 - f) // Semi-minor axis (polar radius) // Distance calculation (iterative) distance = b × A × (σ - Δσ) where A and Δσ are derived through iteration until convergence (Δλ < 10⁻¹² radians)
Variables Explained
- a: Earth's equatorial radius (6,378.137 km)
- b: Earth's polar radius (6,356.752 km)
- f: Flattening factor (how “squashed” Earth is)
- σ: Angular distance on the sphere
- λ: Difference in longitude
Worked Example
New York (JFK) to London (LHR):
- JFK: 40.6413° N, 73.7781° W
- LHR: 51.4700° N, 0.4543° W
- Result: 5,567 km (3,459 miles)
Why Not Use the Simpler Haversine Formula?
The Haversine formula treats Earth as a perfect sphere, which introduces errors of up to 0.5% on long distances. For a 10,000 km flight, that's a 50 km error. Vincenty accounts for Earth's ellipsoidal shape and is accurate to within 0.5mm—though we round results to whole kilometers since sub-meter precision isn't meaningful for flights.
Understanding Your Results
Did You Know?
The jet stream can add or subtract over an hour from your flight time! Flights from the US to Europe typically take 1-2 hours less than the return trip because westbound flights fight against the jet stream (winds up to 250 mph), while eastbound flights ride it. That's why our estimates represent average times—your actual flight could be faster or slower.
Distance Values
- Miles: Standard unit for US frequent flyer programs
- Kilometers: Standard unit worldwide, used for international reporting
- Nautical Miles: Aviation industry standard, used in flight planning
All three represent the same great circle distance, just in different units.
Flight Time Estimates
- Short-haul (<3h): Usually accurate within ±15 minutes
- Medium-haul (3-7h): May vary ±30 minutes due to routing
- Long-haul (>7h): Can vary ±1 hour based on jet stream
Always check airline schedules for actual flight times.
CO2 Emissions
- <500 kg: Typical short-haul economy flight
- 500-1,500 kg: Medium to long-haul economy
- >1,500 kg: Ultra-long-haul or premium cabins
For context: Average tree absorbs ~21 kg CO2 per year.
Popular Airports
Explore detailed information for the busiest airports in our database, ranked by number of destinations served.
Trusted Sources & References
AirMilesCalc relies on authoritative, peer-reviewed data sources and scientifically validated calculation methods.
Understanding Air Miles for Loyalty Programs
Frequent flyer programs award miles based on the great circle distance between airports—the same distances AirMilesCalc calculates. Here's how the major programs work and how to maximize your earning potential.
Major Frequent Flyer Programs
| Program | Airline | Alliance | Earning Basis | More Info |
|---|---|---|---|---|
| MileagePlus | United Airlines | Star Alliance | Revenue-based + distance | united.com |
| SkyMiles | Delta Air Lines | SkyTeam | Revenue-based | delta.com |
| AAdvantage | American Airlines | oneworld | Revenue-based + distance | aa.com |
| Executive Club | British Airways | oneworld | Distance-based (Avios) | ba.com |
| Flying Blue | Air France / KLM | SkyTeam | Revenue-based | flyingblue.com |
| Miles & More | Lufthansa Group | Star Alliance | Distance-based + status | miles-and-more.com |
| Skywards | Emirates | Independent | Distance-based + class | emirates.com |
Programs frequently change their earning structures. Always verify current rules with the airline directly.
Tip: Distance-Based vs Revenue-Based Programs
Distance-based programs (like British Airways Avios or Lufthansa Miles & More) award miles per kilometer flown, making our calculator directly useful for estimating earnings. Revenue-based programs (like Delta SkyMiles) award miles based on ticket price, but understanding the flight distance still helps with redemption planning. Use our distance calculator to plan the most efficient routes for your loyalty goals.
Flight vs Driving: When Does Flying Make Sense?
For shorter distances, driving can be faster when you factor in airport check-in, security, and boarding. Here's a general comparison based on door-to-door travel time. For specific routes, check our distance calculator which includes driving time estimates.
| Distance | Driving Time | Flying Time (door-to-door) | CO2 Driving | CO2 Flying (Economy) | Recommendation |
|---|---|---|---|---|---|
| < 200 km | ~2.5h | ~3-4h | ~30 kg | ~51 kg | Drive |
| 200-500 km | ~3-6h | ~3-4h | ~50-75 kg | ~51-128 kg | Either |
| 500-1,000 km | ~6-12h | ~3.5-5h | ~75-150 kg | ~128-255 kg | Fly |
| > 1,000 km | 12h+ | ~4-6h | 150+ kg | 255+ kg | Fly |
CO2 estimates: Driving based on average car (~150 g/km). Flying based on DEFRA 2024 economy class factors. Door-to-door flying time includes ~2h for airport procedures. Train may be optimal for 200-800 km in Europe. See European Environment Agency data.
Learn More About AirMilesCalc
Methodology & sources
Every formula, constant, and data source AirMilesCalc uses — Vincenty on WGS-84, DEFRA 2024, Lee 2021 radiative forcing, OpenFlights.
Contact Us
Have questions, found a bug, or want to suggest a feature? We'd love to hear from you. We aim to respond within 48-72 hours.
Privacy & Data
No first-party trackers, no signup, no search history retained. The site is funded by Google AdSense; the full third-party disclosure is in /privacy.
Frequently Asked Questions
How does AirMilesCalc calculate flight distances?
We use the Vincenty formula for geodesic distance calculations, which is accurate to within 0.5mm on Earth's surface. This formula accounts for Earth's ellipsoidal shape using WGS-84 parameters, providing the most accurate great circle distance between two airports. Read the full Vincenty deep-dive.
What is a great circle distance?
A great circle distance is the shortest path between two points on Earth's surface, following the planet's curvature. This is the route aircraft actually fly (with minor adjustments for wind and airspace), unlike straight lines on flat maps which can be deceiving.
How accurate are the flight time estimates?
Flight times are calculated using an average cruise speed of 850 km/h (528 mph) plus ground time for taxi, takeoff, and landing (30-50 minutes depending on route length). Actual times vary with aircraft type, wind conditions, and routing.
How are CO2 emissions calculated?
We use DEFRA 2024 emission factors, which are internationally recognized standards. These include a radiative forcing multiplier (1.9x) to account for non-CO2 effects at altitude. Emissions vary by cabin class due to different seat space allocations. See our end-to-end CO₂ calculation for details.
Should I consult a professional for important decisions?
Yes. AirMilesCalc provides estimates for informational purposes only. For official documentation, carbon accounting, or business decisions, consult airline schedules and certified environmental consultants. Read our full terms of service for more details.
How many airports does AirMilesCalc cover?
Our database includes over 3,000 commercial airports worldwide with IATA codes. Data is sourced from OpenFlights and includes major international hubs as well as regional airports with scheduled commercial service.
Is AirMilesCalc free to use?
Yes — every feature is free with no registration, no premium tier, and no upsell. Hosting is funded by Google AdSense advertising; AirMilesCalc itself runs no first-party trackers and retains no search history. Full details in our privacy policy.
Can I use this for frequent flyer calculations?
Yes, the distances shown are the same great circle distances used by most airline frequent flyer programs. However, actual miles earned may vary based on fare class, promotions, and airline-specific rules. Always check with your airline for exact earning rates.
Why do actual flight times differ from estimates?
Our estimates assume direct routing and average conditions. Real flights may take longer due to jet stream headwinds, air traffic control routing, weather diversions, or airport congestion. Tailwinds can also make flights shorter than estimated.
Can I embed AirMilesCalc on my website?
Linking to AirMilesCalc is welcome without permission. For embedding the calculator directly on your site, please contact us to discuss options.
How do I report a bug or request a feature?
We welcome feedback! Use our contact form to report bugs (include browser and device info) or suggest new features. We aim to respond within 48-72 hours.