Flight Time Calculator

A flight time calculator answers two different questions. If you already hold a ticket, it turns the local departure and arrival times printed on it into the real time you will spend traveling. If you are still planning, it estimates how long a flight takes between two airports from the great-circle distance. Both answers depend on the same detail that trips people up: every time on an itinerary is local, and local clocks disagree.

Three sister tools cover the neighboring questions. The Time Zone Calculator converts a single clock time between cities, the Speed Distance Time Calculator solves the basic travel equation for any vehicle, and the Date and Time Calculator adds hours and minutes to a date. Use this page when an airport pair, a time zone change or a date line is part of the problem.

How flight duration is calculated across time zones

Airlines print departure and arrival times in the local time of each airport. Subtracting one from the other only works when both airports share a clock, so the first step is to move both moments onto a common reference: Coordinated Universal Time, or UTC. Each local time has a UTC offset for that date, and the offset changes when a place switches to or from daylight saving time.

The calculator looks up each offset in the IANA time zone database, the reference that operating systems and browsers use to track every past and announced change to time zone boundaries, offsets and daylight saving rules. That is why it can tell that Los Angeles is on UTC−7 in October but UTC−8 in December, and that Phoenix stays on UTC−7 all year.

Offsets are not always whole hours. India uses UTC+5:30 all year, so a flight that leaves Los Angeles at 10:00 PM on Saturday, October 31, 2026 (05:00 UTC on November 1) and lands in Delhi at 4:30 AM on Monday, November 2 (23:00 UTC on November 1) takes exactly 18 hours, even though the calendar moves two days and the clock face moves 30 hours 30 minutes.

Worked example: Los Angeles to Sydney across the date line

A flight leaves Los Angeles at 10:30 PM on Tuesday, October 20, 2026 and lands in Sydney at 7:00 AM on Thursday, October 22. On the clock faces that looks like 32 hours 30 minutes. Converting both ends to UTC tells a different story:

Sydney moved to daylight saving time on Sunday, October 4, 2026, so in late October it runs 18 hours ahead of Los Angeles. Those 18 hours are exactly the gap between the clock-face difference and the real duration. The great-circle distance for this pair is 7,494 miles, so the example schedule implies an average of 517 mph gate to gate, while the calculator's default estimate for the route is 15 hours 29 minutes.

The return trip shows the opposite effect. Leave Sydney at 11:30 AM on Friday, October 23 (00:30 UTC) and land in Los Angeles at 6:45 AM on the same Friday (13:45 UTC): the flight lasts 13 hours 15 minutes, yet you arrive earlier on the clock than you departed.

Worked example: a red-eye on the night clocks fall back

US daylight saving time ends at 2:00 a.m. on the first Sunday of November, which in 2026 is November 1. Take a red-eye that leaves Los Angeles at 10:00 PM on Saturday, October 31 and lands at New York JFK at 6:00 AM on Sunday, November 1.

Someone who subtracts the familiar three-hour difference from the eight clock hours gets 5 hours, which is an hour short. New York fell back at 06:00 UTC and Los Angeles at 09:00 UTC, both while the airplane was in the air. The calculator flags this with a note so the result does not look like a typo. The spring change has its own trap: on Sunday, March 8, 2026, clocks jump from 2:00 to 3:00 a.m., so a time such as 2:30 a.m. does not exist that night. If you enter it, the calculator reads it as 3:30 a.m. daylight time and tells you so.

How the flight distance is measured

Long-distance airliners fly close to great-circle routes, the shortest path between two points on a sphere. The calculator measures that path with the haversine formula, using each airport's latitude φ and longitude λ in radians:

R is the volumetric mean radius of the Earth from NASA's Earth fact sheet. Kilometers convert to statute miles at exactly 1.609344 km per mile and to nautical miles at exactly 1.852 km per nautical mile, the definitions published by NIST. Coordinates for the 77 US airports come from FAA airport data; the other 92 airports use the open OurAirports database, cross-checked against a second independent airport dataset.

The Earth is slightly flattened, with an equatorial radius of 6,378.137 km and a polar radius of 6,356.752 km, so a sphere is an approximation. Measured on the WGS 84 ellipsoid, JFK to LAX is 2,474.9 miles instead of 2,469.5, a difference of 0.22%. At 500 mph those 5.4 miles are worth less than a minute, which is far smaller than the effect of wind or routing.

Worked example: estimating New York JFK to Los Angeles

Planning mode turns the distance into time with one line of arithmetic:

The route is 2,469 statute miles, 3,974 km or 2,146 nautical miles. Departing at 8:00 AM EDT on Friday, October 16, 2026 means 12:00 UTC; adding 5 hours 26 minutes gives 17:26 UTC, which is 10:26 AM PDT in Los Angeles. The speed assumption matters: at 450 mph the estimate grows to 5 hours 59 minutes, and at 550 mph it shrinks to 4 hours 59 minutes.

Estimated flight times for common US routes

Every row below was computed with the calculator's defaults: great-circle distance, 500 mph, no wind and a 30-minute allowance. Use them as a planning baseline, not as a timetable. Short hops between busy airports usually take longer than the estimate because ground time dominates.

For comparison, a few international routes from US gateways, computed the same way:

What changes the result

Wind is the largest single factor. Within the jet stream the winds blow from west to east, and NOAA notes that they can exceed 275 mph at heights of four to eight miles. The wind field in the calculator adds a tailwind to the ground speed or subtracts a headwind. Here is what a steady wind component does to the New York to Los Angeles estimate at the default 500 mph:

A 75 mph wind either way spreads the same trip across an hour and a half, which is why one direction of a coast-to-coast route is usually scheduled well apart from the other. Beyond wind, four things move real flight times away from the estimate:

• Routing. Airways, restricted airspace and weather detours make the flown distance longer than the great circle.
• Ground time. Taxiing and departure queues at large hubs can take longer than the flat 30-minute allowance, especially on short flights.
• Aircraft type. Turboprops and small regional jets cruise slower than mainline jets, so lower the speed for them.
• Schedule buffers. Scheduled block times can include extra minutes to absorb typical delays.

How to use this calculator

Choose a mode with the two buttons at the top. How long is the flight? estimates a route: pick the departure and arrival airports (169 are listed, grouped by region), set the local departure date and time, and adjust the cruise speed, the allowance and the wind if you have better numbers than the defaults. The result shows the distance in three units, the estimated time, the local arrival time with a day label, and a step-by-step breakdown. The swap button reverses the route, the route buttons load six routes discussed on this page, and the date button fills in today's date.

Duration from my ticket computes the exact elapsed time. Pick the departure airport, enter the local date and time from the itinerary, then do the same for the arrival. If a city is not in the airport list, choose its time zone from the group at the bottom of the same menu. The result shows the duration, the clock change between the two ends, how many calendar days the local date moves, and a note whenever a date line jump or a daylight saving change is involved.

Who this calculator is for

Travelers use it to plan connections and pickups, since the gap between local times is rarely the gap between moments. Parents booking flights for children traveling alone use the ticket mode to know exactly how long the trip lasts. Frequent flyers compare estimated times to judge whether a schedule is padded or tight. Travel planners and assistants use the airport mode to sketch itineraries before fares are available, and remote teams use the arrival time to decide when a colleague can join a call after landing. Students working on great-circle problems can check the haversine result against the step-by-step card.

Key terms

• Block time: gate-to-gate time, from leaving the departure gate to arriving at the destination gate. Schedules show block time.
• Air time: takeoff to landing only, without taxiing.
• Great circle: the shortest path between two points on a sphere; long-haul routes follow it closely.
• UTC: Coordinated Universal Time, the common reference clock for aviation and for this calculation.
• UTC offset: how far a local clock is ahead of or behind UTC on a given date, such as UTC−5 for Eastern Standard Time.
• IANA time zone: a named zone such as America/New_York in the database that records offsets and daylight saving rules over time.
• Nautical mile: exactly 1,852 meters, or about 1.150779 statute miles; aviation speeds in knots are nautical miles per hour.
• Ground speed: speed over the ground, equal to the airplane's airspeed plus a tailwind or minus a headwind.
• Red-eye: an overnight flight that departs late in the evening and lands early in the morning.
• International Date Line: the line in the Pacific where the calendar date changes by one day.

Tips for planning around flight times

• Copy times exactly as the itinerary shows them, local at each airport, and never convert them yourself before entering them.
• Check the arrival date on the ticket. A "+1" or "+2" next to the arrival time means one or two calendar days later.
• Plan pickups from the local arrival time, then add time for taxiing to the gate, deplaning and baggage.
• For a coast-to-coast estimate, try a 50 to 75 mph tailwind eastbound and a similar headwind westbound to see the realistic range.
• On short routes between busy airports, raise the allowance to 45 minutes or more; ground time dominates a 200-mile flight.
• Double-check any trip that departs or lands overnight on the second Sunday of March or the first Sunday of November.

Limitations

The estimate is a planning figure built on one average speed and a flat allowance, so it cannot reproduce a specific airline schedule, a specific aircraft or the winds on a given day. It ignores connections and layovers entirely; for a trip with a stop, add the legs and the connection time yourself, or use the ticket mode on the full itinerary.

The distance is spherical, which is within about a third of a percent of the ellipsoidal value on the routes tested here. Time zone results rely on the IANA data that ships with your browser; a very outdated browser may not know about recent rule changes. Only 169 airports carry coordinates, so the distance estimate is unavailable for smaller airports, although the ticket mode works for any city through its time zone.

Related calculators

• To convert one clock time between two cities, use the Time Zone Calculator.
• For straight-line distance between two points on a coordinate plane, use the Distance Calculator.
• To solve for speed, distance or time for any trip, use the Speed Distance Time Calculator.
• To add hours and minutes to a date and time, use the Date and Time Calculator.
• To add up several durations, such as two legs and a layover, use the Time Calculator.
• If you are weighing a road trip instead, the Fuel Cost Calculator estimates the gas cost.

Sources

• NASA Goddard Space Flight Center, Earth Fact Sheet: volumetric mean radius 6,371.000 km, equatorial radius 6,378.137 km, polar radius 6,356.752 km.
• NIST Special Publication 811, Appendix B.8: 1 mile = 1.609344 km, 1 nautical mile = 1,852 m.
• NIST, Daylight Saving Time: US daylight saving time begins at 2:00 a.m. on the second Sunday of March and ends at 2:00 a.m. on the first Sunday of November; not observed in Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and Arizona (except the Navajo Nation).
• IANA, Time Zone Database: the source of the UTC offsets and daylight saving rules applied by your browser.
• NOAA JetStream, The Jet Stream: jet stream winds blow from west to east and can exceed 275 mph.
• FAA Aeronautical Data Delivery Service: airport reference coordinates for the US airports in the list.