| 1. Fritzie Nathansen |  Denmark | 1:07.8 | | | | | 2. Johanna Termeulen |  Netherlands | 1:08.1 | | +0.3s | | | 3. Greta Andersen | Denmark | 1:08.3 | | +0.5s | | | 4. Ingegärd Fredin |  Sweden | 1:08.5 | | +0.7s | | | 5. Gisela Thidholm | Sweden | 1:08.8 | | +1.0s | | | 6. Irma Schuhmacher | Netherlands | 1:09.8 | | +2.0s | | | 7. Fernande Caroen |  Belgium | 1:10.6 | | +2.8s | |
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| World and European Record: Willy den Ouden, Netherlands 1:04.6 |
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Heats Thursday, 11th September | | Best 2 from each Heat and Best 3rd advanced to Final. |
| Heat 3 | | time | | gap | L | Rk | | 1. Johanna Termeulen | Netherlands | 1:07.0 | | | 2 | 1. | | 2. Fernande Caroen | Belgium | 1:09.5 | | +2.5s | 1 | 6. | | 3. Gisela Thidholm | Sweden | 1:09.5 | | +2.5s | 5 | 7. | | 4. Carala Calligaris |  Italy | 1:14.3 | | +7.3s | 4 | 13. | | -. Eva Szekely |  Hungary | | | | 3 | |
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| Heat 2 | | time | | gap | L | Rk | | 1. Ingegärd Fredin | Sweden | 1:07.9 | | | 2 | 3. | | 2. Greta Andersen | Denmark | 1:08.1 | | +0.2s | 3 | 4. | | 3. Lillian Preece |  Great Britain | 1:10.6 | | +2.7s | 4 | 8. | | 4. Colette Thomas |  France | 1:13.2 | | +5.3s | 5 | 12. | | -. Adalgisa Kuschnig | Italy | | | | 1 | |
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| Heat 1 | | time | | gap | L | Rk | | 1. Fritzie Nathansen | Denmark | 1:07.2 | | | 1 | 2. | | 2. Irma Schuhmacher | Netherlands | 1:09.5 | | +2.2s | 2 | 5. | | 3. Josette Delmas | France | 1:10.7 | | +3.5s | 4 | 9. | | 4. Nancy Riach | Great Britain | 1:10.8 | | +3.6s | 5 | 10. | | 5. Maria Van der Brande | Belgium | 1:12.5 | | +5.3s | 3 | 11. | | 6. Judit Temes | Hungary | 1:15.5 | | +8.3s | 6 | 14. |
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| Some sources state times of Irma Schuhmacher 1:09.2 and Nancy Riach 1:09.6 |
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Nancy Reach, Great Britain was taken out of water in bad conditions and died 4 days later in Hospital. She contracted poliomelo in Monte Carlo and competed against medical advise.
| Ranking | | time | FR | | 1. Fritzie Nathansen | Denmark | 1:06.6 | 1. | | 2. Johanna Termeulen | Netherlalnds | 1:06.9 | 2. | | 3. Curties |  United States | 1:07.0 | | | 4. Greta Andersen | Denmark | 1:07.1 | 3. | | 5. Karen Margrete Harup | Denmark | 1:08.0 | NE | | 5. Ingegärd Fredin | Sweden | 1:08.0 | 4. | | 7. Eva Szekely | Hungary | 1:09.0 | | | 8. Irma Schumacher | Netherlands | 1:09.2 | 6. | | 9. Vaessen | Netherlands | 1:09.6 | | | 10.Gisela Thildomm | Sweden | 1:09.7 | 5. |
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| 2 competitors from nation were allowed participate. |
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