Cosmic radiation dose by flight route
Each route has a page for each direction, because the two directions differ: flying west into the prevailing winds takes longer, and cosmic radiation builds up with every minute aloft. The doses below are the FAA's CARI-7 model run for a standard flight at 35,000 ft with the solar conditions of August 2026.
Updated
Popular routes, both directions
| Route | One way | Dose | In the air | The other way | Dose | In the air |
|---|---|---|---|---|---|---|
| New York – London | JFK → LHR | 26.5 µSv | 6 h 18 min | LHR → JFK | 31 µSv | 7 h 16 min |
| New York – Los Angeles | JFK → LAX | 20.2 µSv | 5 h 19 min | LAX → JFK | 17.2 µSv | 4 h 35 min |
| Dallas-Fort Worth – New York | DFW → JFK | 9.41 µSv | 2 h 44 min | JFK → DFW | 11.1 µSv | 3 h 8 min |
| New York – San Francisco | JFK → SFO | 21.9 µSv | 5 h 32 min | SFO → JFK | 18.5 µSv | 4 h 45 min |
| Los Angeles – San Francisco | LAX → SFO | 1.89 µSv | 1 h | SFO → LAX | 1.69 µSv | 56 min |
| New York – Chicago | LGA → ORD | 5.93 µSv | 1 h 49 min | ORD → LGA | 4.87 µSv | 1 h 35 min |
| Atlanta – Los Angeles | ATL → LAX | 14.2 µSv | 4 h 14 min | LAX → ATL | 12 µSv | 3 h 40 min |
| New York – Miami | JFK → MIA | 7.32 µSv | 2 h 25 min | MIA → JFK | 6.94 µSv | 2 h 18 min |
| Honolulu, Oahu – Los Angeles | HNL → LAX | 10.5 µSv | 4 h 47 min | LAX → HNL | 11.9 µSv | 5 h 25 min |
| New York – Paris | JFK → CDG | 27.3 µSv | 6 h 36 min | CDG → JFK | 31.9 µSv | 7 h 37 min |
| Chicago – London | ORD → LHR | 31.2 µSv | 7 h 11 min | LHR → ORD | 36.2 µSv | 8 h 14 min |
| Los Angeles – London | LAX → LHR | 43.4 µSv | 9 h 56 min | LHR → LAX | 48.7 µSv | 11 h 6 min |
| New York – Hong Kong | JFK → HKG | 61.1 µSv | 15 h 24 min | HKG → JFK | 60.1 µSv | 15 h 6 min |
| Los Angeles – Narita | LAX → NRT | 35.2 µSv | 11 h 6 min | NRT → LAX | 30.9 µSv | 9 h 46 min |
| San Francisco – Singapore | SFO → SIN | 42.4 µSv | 16 h 42 min | SIN → SFO | 39.1 µSv | 15 h 24 min |
| Dubai – New York | DXB → JFK | 51.6 µSv | 13 h 36 min | JFK → DXB | 46.4 µSv | 12 h 19 min |
| London – Dubai | LHR → DXB | 16.5 µSv | 6 h 10 min | DXB → LHR | 19.2 µSv | 7 h 2 min |
| London – Singapore | LHR → SIN | 30.8 µSv | 12 h 3 min | SIN → LHR | 34.6 µSv | 13 h 23 min |
| London – Johannesburg | LHR → JNB | 21.6 µSv | 10 h 36 min | JNB → LHR | 22.3 µSv | 10 h 53 min |
| Los Angeles – Sydney | LAX → SYD | 28.5 µSv | 14 h 12 min | SYD → LAX | 28.5 µSv | 14 h 12 min |
| Singapore – Sydney | SIN → SYD | 14.9 µSv | 7 h 20 min | SYD → SIN | 15.9 µSv | 7 h 52 min |
| São Paulo – New York | GRU → JFK | 20.7 µSv | 9 h 14 min | JFK → GRU | 20.1 µSv | 9 h 3 min |
1,000 µSv = 1 mSv. For scale, the FlightDose app counts a chest X-ray as 0.1 mSv (100 µSv). See every route on the dose-rate map, browse them by airport, or read how the doses are calculated.
Your route isn't here, or your flight was different?
These pages describe one standard flight per direction. The FlightDose app runs CARI-7 for your own flight: any two airports, your date, your altitude and your time in the air, and keeps your total.
FlightDose calculates your exact flight.
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