| Course | Date | Distance Knots | Time | Speed, Knots |
| Rockaway-Chatham (forced landing about 100 miles off Chatham) | May 8 | 300 | 5.45 | 52 |
| Chatham-Halifax | May 14 | 320 | 3.51 | 85 |
| Halifax-Trepassey | May 15 | 460 | 6.20 | 72.6 |
| Trepassey-Horta | May 16-17 | 1,200 | 15.18 | 78.4 |
| Horta-Ponta Delgada | May 20 | 150 | 1.45 | 86.7 |
| Ponta Delgada-Lisbon | May 27 | 800 | 9.44 | 82.1 |
| Trepassey-Lisbon | ... | 2,150 | 26.47 | 80.3 |
The total flying time from Rockaway, N. Y., to Lisbon, Spain, was 42.43.
The fastest previous passage of the Atlantic was made by the giant Cunard liner Mauretania, which made the trip from Liverpool to New York in four days, 14 hours, and 27 minutes.
Here is the log of the last leg of the transatlantic flight, completed with the arrival of the NC-4 at Plymouth, based on wireless and cabled despatches received at the Navy Department.
1.21 A. M., from Plymouth: “NC-4 left Lisbon 6.23 (New York 2.23 A. M.), May 30, and landed Mondego River, getting underway and proceeding to Ferrol, where landed at 16.46 (12.46 New York time). Destroyers standing by NC-4; will proceed to Plymouth to-morrow if weather permits.”
6.50 A. M.—From Admiral Knapp at London: “From the Harding: ‘U. S. S. Gridley to U. S. S. Rochester, NC-4 expects to leave Ferrol for Plymouth at 6 A. M. to-morrow morning, signed Read.’”
7.22 A. M.—From Admiral Knapp at London: “NC-4 left Ferrol at 06.27 (2.27 A. M. New York time).”
8.11 A. M.—From Admiral Knapp at London: “Following received from U. S. S. George Washington: ‘From U. S. S. Stockton, NC-4 passed station two at 07.43 (3.43 A. M. New York time).’”
9.24 A. M.—From Admiral Knapp at London: “NC-4 passed station four at 09.06 (5.06 New York time).”
9.50 A. M.—From Admiral Knapp: “NC-4 arrived at Plymouth at 14.26.31, English civil time (9.26 A. M. New York time).”