AirHint found the following cheapest return flights from Ottawa (YOW) to London (LGW) in March 2026 (see full year).

Return flights

01 Mar - 11 Mar	Air Transat
01 Mar - 06 Mar	Air Transat
31 Mar - 07 Apr	Air Transat
30 Mar - 06 Apr	Air Transat
31 Mar - 25 Apr	Air Transat
24 Mar - 31 Mar	Air Transat
25 Mar - 31 Mar	Air Transat
17 Mar - 11 Apr	Air Transat
28 Mar - 18 Apr	Porter Airlines (Canada) Ltd
15 Mar - 25 Mar	Air Transat
25 Mar - 03 Apr	Porter Airlines (Canada) Ltd
08 Mar - 28 Mar	Air Transat

Also check the deals for one-way flights from Ottawa to London in March.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Ottawa to London in March from 472€

Return flights