Cheap Flights from St Louis to Ottawa
No deal from St Louis to Ottawa has cleared our price bar yet. What we have seen on the route is below.
Across 4 months of observations from St Louis to Ottawa, the lowest round-trip fare we recorded was $520, in August. The typical fare was $631. August was the cheapest month we saw and October the dearest.
The most recent price we saw on this route was $866 on Air Canada and United, seen Oct 16. It is an unverified observation and may have changed.
See every deal <a href="/from/st-louis">from St Louis</a>, <a href="/to/ottawa">to Ottawa</a>, or the return direction <a href="/from/ottawa/to/st-louis">Ottawa to St Louis</a>.
Latest price we saw: St Louis to Ottawa
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| St Louis (STL) to Ottawa (YOW) | $866 | 49.3¢ | Nov 5 – Nov 11 | Air Canada and United | Oct 16 | Check price |
Price history: St Louis to Ottawa
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $634 | $727 | 6 |
| Sep 2026 | $561 | $611 | 18 |
| Aug 2026 | $520 | $591 | 27 |
| Jul 2026 | $595 | $595 | 1 |
Frequently asked questions
How many flight deals from St Louis to Ottawa are on Sparkflights right now?
There are 0 verified deals from St Louis to Ottawa on the board right now. The list refreshes hourly.
What is the lowest price ever seen from St Louis to Ottawa?
The lowest fare we've recorded from St Louis to Ottawa is $520, based on 52 price observations over 4 months.
How much does a flight from St Louis to Ottawa cost?
The typical round-trip fare we observed from St Louis to Ottawa is $631, against a recorded low of $520. These are observations, not quotes.
When is the cheapest month to fly St Louis to Ottawa?
August was the cheapest month we observed from St Louis to Ottawa and October the dearest, over 4 months of data.
What is the current price from St Louis to Ottawa?
The most recent fare our sweep saw from St Louis to Ottawa is $866, on Oct 16. It is an unverified observation rather than a verified deal, so check it before booking.