Route guide · 1,731 miles
Cheap Flights from San Francisco to St. Louis
SFO → STL · Nonstop 4h 1m · Live round-trip fares
Plenty of travelers price out San Francisco to St. Louis every day — here's how to beat the average fare. Nonstops run about 4h 1m, and the calendar matters more than the airline. Aim to book 3–6 weeks ahead, stay flexible on the day of the week, and set a free alert so a price drop never slips past you.
Live fares for SFO → STL are updating. Use the search below for real-time prices.
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Updated daily
Flight time
4h 1m
Nonstop, typical
Distance
1,731 mi
SFO → STL
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
1
United Airlines
Nonstop flights from San Francisco to St. Louis
The fastest way between the two cities is the nonstop: about 4h 1m for the 1,731-mile run from SFO to STL. Those flights are flown by United Airlines. Prices behave best when you book 3–6 weeks out.
Booking insights: San Francisco → St. Louis
- Distance: 1,731 miles · nonstop flight time: 4h 1m.
- Fares tend to bottom out when you book about 3–6 weeks ahead — earlier than that rarely helps, later usually hurts.
- Tuesday and Wednesday departures usually undercut Friday and Sunday fares on routes like this one.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
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Flying from San Francisco to St. Louis: what you need to know
The flight
At 1,731 miles, this is a long domestic flight — about 4h 1m gate to gate on a nonstop. It deserves a bit of planning: eat before you board or buy early (popular items sell out), and pick your seat with the flight length in mind.
Airlines on this route
United Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from San Francisco (SFO)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our San Francisco airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in St. Louis (STL)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The St. Louis airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check St. Louis to San Francisco fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 1,731 miles, booking 3–6 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 4h 1m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
San Francisco to St. Louis flight FAQs
How long is the flight from SFO to STL?
Nonstop flights from San Francisco to St. Louis take about 4h 1m and cover roughly 1,731 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from San Francisco to St. Louis?
United Airlines typically operate nonstop flights from SFO to STL. Nonstops are usually cheapest when booked 3–6 weeks ahead of departure.
What is the cheapest month to fly from San Francisco to St. Louis?
Travelers usually find the gentlest prices away from peak periods — think post-holiday January and the early-fall weeks. Midweek dates inside those windows are cheaper still.
How much are last minute flights from SFO to STL?
Last-minute flights from SFO to STL (booked within 7 days of departure) typically cost noticeably more than fares booked 3–6 weeks out. Booking early is the smarter move.
What is a good round-trip deal from San Francisco to St. Louis?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from San Francisco to St. Louis?
You'll mainly see United Airlines on San Francisco to St. Louis. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to San Francisco airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from San Francisco
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