Alaska Airlines, United, and Delta have round-trip flights from Seattle (SEA) to St. Louis, Reno, New York/Newark, Fort Lauderdale, Ontario CA, Orlando, Palm Springs, San Diego, San Francisco, or Santa Ana (STL, RNO, EWR, FLL, ONT, MCO, PSP, SAN, SFO, SNA) for $91-$192, NONSTOP. Dates vary, but most flights are between January to May, see the updated link list for exact ranges. Origin/Destination reversible.
Newark is the most expensive fare in this list ($177 to $192).
Southwest has round-trip flights from Atlanta (ATL) to St. Louis (STL) for $137, NONSTOP. Flights August to November. No Weekends. Departures on Monday, Tuesday, Wednesday, and Thursday. Origin/Destination reversible. No Thanksgiving dates.
Southwest and American Airlines have round-trip flights from Seattle (SEA) to St. Louis (STL) for $117-$175 with a connection. Flights August to December. Weekends available. Origin/Destination reversible. No Christmas dates available.
Southwest has round-trip flights from Denver (DEN) to St. Louis, Santa Ana CA, Portland OR, Nashville, Washington D.C., Seattle, San Francisco, San Diego, Phoenix, Los Angeles, Las Vegas (STL, SNA, PDX, BNA, DCA, SEA, SFO, SAN, PHX, LAX, LAS) for $94-$171, NONSTOP. Flights dates vary, but most are between August to November. Holiday blackouts.
Southwest and United have round-trip flights from Chicago (MDW/ORD) to St. Louis or Pittsburgh (STL, PIT) for $77-$138, NONSTOP. Flights June to October. Extended weekends available. Origin/Destination reversible.
Southwest, United, and American Airlines have round-trip flights from Chicago (MDW/ORD) to St. Louis, Cleveland, or Buffalo (STL, CLE, BUF) for $77-$91, NONSTOP. Flights May to September. No Weekends. Departures on Monday, Tuesday, Wednesday, and Thursday. Origin/Destination reversible.
United and American have matched the Southwest sale for most destinations.
[03/09/2025 @ 07:45 PM CT] Price dropped to $79-$103 from $95-$125.
Southwest has round-trip flights from Chicago (MDW) to St. Louis, Nashville, Minneapolis, Grand Rapids, Detroit, or Cincinnati (STL, BNA, MSP, GRR, DTW, CVG) for $95-$120, NONSTOP. Flights March to June. Weekends available, but no cheap Sunday departures were found. Origin/Destination reversible.
Southwest and United have round-trip flights from Chicago (MDW) to St. Louis, Pittsburgh, Minneapolis, or Nashville (STL) for $97, NONSTOP. Flights March to June. No Weekends. Departures on Monday, Tuesday, Wednesday, and Thursday. Origin/Destination reversible.
United and Southwest have round-trip flights from Chicago (ORD, MDW) to St. Louis, Pittsburgh, Nashville, Grand Rapids, or Detroit (STL, PIT, BNA, GRR, DTW) for $117-$132, NONSTOP. Flights March to May. Origin/Destination reversible.
American Airlines has round-trip flights from Newark/New York (EWR) to St. Louis, San Antonio, Key West, Salt Lake City, Kansas City, Grand Rapids, or Asheville (STL, SAT, EYW, SLC, MCI, GRR, AVL) for $150 with a connection. Flights January to March. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
United has round-trip flights from Denver (DEN) to St. Louis or Sacramento (STL, SMF) for $131, NONSTOP. Flights November to December. Weekends available. Origin/Destination reversible. Holiday blackouts.
United’s “Basic Economy” fares do not allow for a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.
The personal item size on United is smaller (9 x 10 x 17 inches) than Frontier or Spirit (8 x 13 x 18 inches).
Southwest has round-trip flights from Atlanta (ATL) to St. Louis or Jacksonville (STL, JAX) for $98-$128, NONSTOP. Flights November to December. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible. Holiday blackouts.
United and American Airlines have round-trip flights from Chicago (ORD) to St. Louis, Pittsburgh, or San Diego (STL, PIT, SAN) for $93-$149, NONSTOP. Flights September to November. Very few weekends available. Origin/Destination reversible. Dates over Thanksgiving are available.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
American Airlines has round-trip flights from Los Angeles (LAX) to St. Louis (STL) for $153, NONSTOP. Flights September to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Southwest and United have round-trip flights from Chicago (ORD, MDW) to St. Louis, Salt Lake City, Sacramento, San Antonio, San Jose, CA, or Rochester, NY (STL, SLC, SMF, SAT, SJC, ROC) for $105-$114, NONSTOP. Flights August to December. Weekends available. Origin/Destination reversible. No Christmas dates available.
Note: Southwest is matching on some of these routes but to get the discount requires jumping through a few annoying hoops. First, you can only see the fare in their slow and buggy Southwest (mobile phone) App. Second, you have to use code “BDAY”.
United’s “Basic Economy” fares do not allow for a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.
United and American Airlines have round-trip flights from Chicago (ORD) to St. Louis, Nashville, or Cleveland (STL, BNA, CLE) for $97-$107, NONSTOP. Flights May to November. No Sunday departures. Extended weekends available. Origin/Destination reversible. No Thanksgiving dates.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
United has round-trip flights from Seattle (SEA) to St. Louis, Pittsburgh, New Orleans, or San Antonio (STL, PIT, MSY, SAT) for $157 with a connection. Most flights are in December, January, February, March, April, May, and August. New Orleans flights have a wider range: December to October. Weekends available. Origin/Destination reversible. No Christmas dates available.
We also list every other fare below $169 round-trip for SEA and PAE, See our (PAE/SEA) destination list.
United’s “Basic Economy” fares do not allow for a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.
The personal item size on United is smaller (9 x 10 x 17 inches) than Frontier or Spirit (8 x 13 x 18 inches).
United has round-trip flights from Chicago (ORD) to St. Louis, New York, Nashville, Philadelphia, or Pittsburgh (STL, LGA, BNA, PHL, PIT) for $100-$120, NONSTOP. Flights October to March. Weekends available. Origin/Destination reversible.
This sale is due to United matching Southwest’s 50% fare sale that we mentioned a few days ago. That sale ends tonight at around midnight, when that happens we expect that these matched fares will revert to their regular (higher) price.
American Airlines and United have round-trip flights from New York/Newark (LGA/EWR) to St. Louis (STL) for $148, NONSTOP. Flights May to June. Very few weekends available. Origin/Destination reversible.
United has round-trip flights from Denver (DEN) to St. Louis (STL) for $158, NONSTOP. Flights January to March. Weekends available. Origin/Destination reversible.
