Dulles to Cahokia/St Louis (IAD–CPS) — Airlines, Schedules & Connections

IAD Airport Page →
684 mi airlines charter/private 1/wk
On-time Some delays Frequent delays
Connecting Flight Schedule 13 1-stop flights Verified 3w ago
Also flown by charter / private operators.
Nonstop Charter / private 1-Stop 2-Stop Hide separate tickets Hide overnight Hide codeshares
  Flight Airline AC Dep Arr Dur OTP Sched  
✈ Nonstop

No flights match your filters.

No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.

✦ 1-Stop connections via 10 hubs
MSP Minneapolis 7h 44m AFAMCM → DL Minneapolis (MSP) to Cahokia/St Louis flights
PIT Pittsburgh ~3h 8m AVCMET → Pittsburgh (PIT) to Cahokia/St Louis flights
LGA New York ~4h 17m AAAVUA → New York (LGA) to Cahokia/St Louis flights
JFK New York ~5h AFAMAV → New York (JFK) to Cahokia/St Louis flights
FLL Fort Lauderdale ~5h 33m CMF9SN → Fort Lauderdale (FLL) to Cahokia/St Louis flights
IAH Houston ~7h AVAZCA → Houston (IAH) to Cahokia/St Louis flights
AUS Austin ~7h 2m AZEJAG4 → Austin (AUS) to Cahokia/St Louis flights
DEN Denver ~7h 52m AVAZCM → Denver (DEN) to Cahokia/St Louis flights
PHX Phoenix ~9h 1m AVOSSN → Phoenix (PHX) to Cahokia/St Louis flights
SEA Seattle ~10h 50m ASAVAY → Seattle (SEA) to Cahokia/St Louis flights
✦ 1-STOP More options, longer trips
✧ 2-STOP Loading... Reach the hardest destinations
Dulles to Cahokia/St Louis
Connecting service available through multiple hubs.
3 Airlines 684 mi 2h 8m nonstop -1h behind

IAD–CPS had nonstop service from Sun Country Airlines, Delta Air Lines and FlyNordic, last on the schedule in May 2026. There's no nonstop on it right now, so today you'd fly it with one stop. The connecting options below are sorted by layover. Nonstop, it's about 684 miles in 2h 8m.

Also explore IAD Routes CPS Routes IAD Live Flights CPS Live Flights IAD Delays
All flights from Cahokia/St Louis (CPS) Cahokia/St Louis to Dulles flights
Carriers on this route

Airline Landscape

Carriers that operated nonstop IAD–CPS service, compared side by side.
Airline Freq/wk Aircraft Duration Dep OTP Alliance Codeshares
SY Sun Country Airlines 1 – – 75% – –
DL Delta Air Lines 0 – – 75% SkyTeam –
LF FlyNordic 0 – – 75% – –
Alliance coverage
Unaffiliated: LF + SY (1 flights/wk, 100%)
SkyTeam: DL (0 flights/wk, 0%)
OTP based on airport-level delay snapshots. Duration ranges reflect seasonal/directional variation.
Connections

Connection Landscape

1-stop and 2-stop options for IAD to CPS.
1-STOP
One-Stop Connections
13
Hubs
~3h
Fastest
~29h
Longest
PIT ~3h 8m LGA ~4h 17m JFK ~5h 0m FLL ~5h 33m IAH ~7h 0m
Verified with published schedule alignment and minimum connection time.
Connections computed from published schedules with minimum connection time verification. Use the interactive explorer above the fold to filter by airline, tier, and layover time.
Reliability

On-Time Performance

What to expect at each end of your journey.
Outbound
IAD → CPS
75%
Generally reliable. Most flights run on time.
Departing
75%
Return
CPS → IAD
85%
Generally reliable. Most flights run on time.
Arriving
85%
OTP = percentage of flights arriving within 15 min of schedule. Based on airport-level delay snapshots. IAD delays →
Know before you go

Travel Essentials

Practical planning for this route.
Time Difference
-1h
Cahokia/St Louis is 1 hour behind Dulles.
IAD: EDT · CPS: CDT

When it's 6:00 PM in Dulles, it's 5:00 PM in Cahokia/St Louis.
Distance & Flight Time
684 mi / 1,101 km
Nonstop flight time is approximately 2h 8m gate to gate.
Getting to IAD

WMATA Silver Line Metro now reaches Dulles directly; take Silver Line to Washington Dulles Airport station (about 65 min from Metro Center, ~$7). The connection opened in late 2022.Ride-shares from downtown DC run $35–60 and take 35–50 minutes via I-66 (longer during peak hours). Washington Flyer coach to Wiehle-Reston East Metro costs $6. The airport is 27 miles from downtown; taxis are expensive ($60–80).

Facts

IAD–CPS Quick Facts

Key statistics for the Dulles to Cahokia/St Louis route.
Route details
Distance684 mi / 1,101 km
Flight time2h 8m
Time difference-1 hour
Airlines (nonstop)3
1-stop connectionsAvailable
Origin: IAD
Full nameWashington Dulles International Airport
IATA / ICAOIAD / KIAD
TimezoneAmerica/New_York
Passengers/yr26.0M
Elevation312 ft / 95 m
Destination: CPS
Full nameSt Louis Downtown Airport
IATA / ICAOCPS / KCPS
TimezoneAmerica/Chicago
Elevation413 ft / 126 m
FAQ

Frequently Asked Questions

Common questions about IAD to CPS flights.
Nonstop flights from Washington Dulles International Airport to St Louis Downtown Airport take about 2h 8m gate to gate. The route covers 684 miles.
3 airlines operated the nonstop from IAD to CPS: Sun Country Airlines, Delta Air Lines and FlyNordic. The last scheduled nonstop was in May 2026. There's no nonstop right now, so today you'd fly it with one stop. See the connection options above, ranked by layover.
Not right now. The last scheduled nonstop was in May 2026. You can still fly it with one stop, and the connecting options above are sorted by layover. Nonstop, the hop took about 2h 8m.
Yes, 1-stop connections are available, ranked by layover time. Common connecting points include Minneapolis–Saint Paul.
Cahokia/St Louis is 1 hour behind Dulles.
Yes, return flights from CPS to IAD are available. Use the direction toggle at the top to view the return schedule.
Click the 'Search Flights' button to check availability and prices on Google Flights. You can also compare airlines and schedules on this page to find the best option.
See the On-Time Performance section for the latest delay data at both airports. This shows departure and arrival reliability to help you plan.
Route data is updated regularly from official airline schedules. On-time performance data comes from recent airport delay snapshots.

Flights from IAD to CPS

Washington Dulles International Airport (IAD) and St Louis Downtown Airport (CPS) had nonstop service from Sun Country Airlines, Delta Air Lines and FlyNordic, last on the schedule in May 2026. The nonstop is dormant right now, so the way to fly it today is one connection, and the options above are sorted by layover.

IAD to CPS Flight Duration and Schedule

Nonstop flight time from IAD to CPS is about 2 hours 8 minutes gate to gate. The route covers a distance of 684 miles (1,101 km).

Connecting Options and Alternatives

1-stop connecting options are also available, commonly via Minneapolis–Saint Paul.